THIS 4000W MID DRIVE EBIKE IS INSANE!!! | BAFANG ULTRA HIGH POWER TESTS

[@joem5140]

You're awesome. Smart, fun, happy and not without a cup of tea. Thanks for sharing your joy.

[@lewearle]

You smashed it here Andy. As someone who's used a Bafang BBSHD for the past 2 years, you're really tempting me to upgrade. Even to a Hub Motor. That torque you showed is something I've wanted for ages, when I saw it was in the second highest gear I was blown away.

[@24ology]

Did you end up just running a better controller in the end??

[@AlrexBarclay]

Im building a 750w bafang mid drive. There insane. My nephew has upgraded bac 885 450£ controller 52v he's using. Getting crazy torque. Andy bafang say 160nm. What do they pull standard. As 160 is bigger volts and upgrading controller to 52v /72

[@coreywagman7323]

that battery pack looked like a bunch of dynamite strapped to the frame. you can call that version the Suicide Bomber

[@DigBipper188]

E-bike: B52 edition

[@videosforcatsanddogs214]

How often do you have to change chain and cassette?

[@phillcrean2300]

Superb mate, very interesting indeed. Thanks for giving your time to show these video. Again thanks mate

[@JamesBrown-ux9ds]

Don't forget your protective clothing! With speed from 4kw = 5.5hp right against a tree may hurt.

[@zooper6453]

May hurt lol.

[@dominickrass8473]

It May but it doesent have to

[@cameranbarbieux2802]

I believe in compassion, but I love natural selection more. Let ‘em be. His skill is his own to decide.

[@jakedonnely4094]

Awesome bike mate. I've built a 1500w ebike using a old Peugeot mountain bike, over took a car at 40mph. Gets some crazy looks

[@BH4x0r]

doesn't mean you need to ride that fast, i use 4kW aswell, just for high acceleration etc, but still at low speeds lol

[@BuildProne]

The cutoff was the same issue I was having. Your motor is drawing more current than your battery can provide so it is shutting off to keep from killing itself. Thats why when you turned the current up it shut off. For instance my motor draws 30amps max where as my old battery didnt provide 30 so if I revved too high it shut off

[@andykirby]

It's not a battery cutoff it was instantaneous phase current error on the phaserunner, they are known for this problem.

[@24ology]

Andy been following your channel for a while now and love seeing your sick mods. Thankyou for sharing !

[@SKBKER]

That is amazing . Last year I finished building my 2500W fat bike with uprated controller, 72V battery and other custom parts . That thing is fooking fast

[@jessebresolino8576]

Congratulations! i am looking for build one too, how much did it cost?

[@SKBKER]

@@jessebresolino8576 It's custom with carbon and titanium so around 7k . You can get far cheaper kits

[@mrsporto]

FYI, you can add a ON/Off switch to the Phaserunner. Wiring info is in the manual. Great video!

[@andykirby]

Ah interesting, I must have missed that thanks👍

[@battery_solar_ev]

4000 watts divided by 72 volts is 55 amp your current limited by the batteries I do realize this was a test but for that current youll need 6 parallel to keep it safe unless cells are rated at 20 amp constant then you can go 3P. Your also current limited by the XT60 though rated at 60 amp they will heat at 30 amps heat is voltage sag along with current loss EC5 can handle 40 amp constant and stay cooler than XT60 but totally your choice on what you use. Now the wire not sure what your using but OFC pretinned is best and at that current 8AWG wire is not always convenient so back to the OFC pretinned. It can handle a bit more current than non-pretinned wire 10AWG high temp would be best that gauge wire will suffer some loss but short as possible will help and the high temp skin will keep it safe. The battery for high current like this .4mm thickness x 8mm wide nickel strip will barely get warm at 40 amps, you can still touch it with no issue. Just thought ide toss this out there so you can get the max power and efficiency from your bike and batteries and keep it safe as well.

[@spookmore]

Steve if I buy a an ebike from cyclone ebikes 72 volt coaxial mid drive motor Will that have enough power. Any info would help.

[@battery_solar_ev]

@@spookmore If the battery is included with the bike then it should be built for the bike and be no problem. If the battery is DIY then the factors i posted above will need to be applied.

[@fojrsepta4959]

Look just because higher voltage increases CURRENT as well as watts when floored does not mean it is sane to needlessly run HIGHER currents the goal in increasing voltage is to lower CURRENT and INCREASE power simultaneously. The indian dude on here believes in single cell massively parallel so balancing is intrinsic just a fat cheap thick buss bar many cells between jarred. GAL transistors built into titanate oxide massive amp hour BRICKS that boost voltage up fifty fold are a story yet told. Via such a scheme a SINGLE kWh in a ELECTRIC unicycle thin And light might run a few hundred volts with permanent magnets in rims precisely tight. Fitness unicycling at fifty miles per hour on soft sand say in Afghanistan at dawn obsoletes camels and makes for a sand ski key to distances travelled glee level ogasmic without notable capitally or OTHERWISE carbonlessly fee. As was pointed out amply by old bearded ebike tooling fool 3kw is a tiny motor over a century done. The ten year old goal of rim motor preceded unicycle by a YEAR and deserves revisit. Besides deep sand ample coastline even unsalted on a spinning disk can be whisked. The jet skis pump water creating CHEAP heavy throwing rocket lifts but leaning hypercontrol is our brains gift to mobility. We no longer need snow and hills or tow. Additionally high air heat or molten water at our feet boils liquid gas power turbine drive famously in nearest future designs. It is said that almost all windpower if kept off wire can reach the 100mph single on tire uphill EVEN against a breeze. The distance five gallons of LIGHTER thAn h20 or not NITROGEN can boiled propel I stand still ignorant of as HELL but wager far ENOUGH. Electricity is far cars or even more useless. Jars hold LIQUID air begging for heat catalytically sped we be joyously fed. Cold synthetic emissionless tech tower's. Join me ABOUT crowing about IT'S Density superfluous HOWEVER superpowers. Put anotherway on electrons YOUR gonnastay regardless of gallons a 💵 N SAY? Ten? A dime a gallon levelised cost makes ANYTHING ELSE HYPE ON FROST.

[@dtbasd5514]

Exactly

[@dtbasd5514]

@@battery_solar_ev Wtf?

[@neekodevinchi]

Fair play Andy. Running the ultra motor with a better controller and at 72v!! You're starting to put a lot of us bafang specialists to shame lol. Keep up the vids mate.

[@barry_g8443]

Just discovered this channel. What an amazing video plus I learnt about balancing batteries properly for the first time. Truly great watch!

[@ash0787]

having played around with a few bikes now I can appreciate this one more ! very good bike and talented creator.

[@goldmagnet9013]

Whats your call sign, saw the 2m rig...

[@matthewbagshaw3789]

Loving the bike chap, excellent work. May I ask how you deal with brakes? You seem to be running hydraulics, for whatever reason, my hydraulic system just boiled fluid when riding aggressively. I'm not sure what power I'm producing, it's 72v - peak battery output 50A (standard 20) the bike will top out at 47mph with a rear hub motor. But I'm a little confused how you produce so much power from such little batteries too. I have 2 36v batteries 10s5p connected in series. What kind of speeds are you getting?

[@XYisnotXX]

How does one go about purchasing one of these then Andy. I believe I may be a customer

[@StewartWaddell]

Andy can I buy one please ?

[@fablob7387]

@@StewartWaddell he sells it

[@fablob7387]

@@StewartWaddell look in the description, he is selling it on his shop

[@pizzagorgonzola]

whats the top speed ? how big is the front chainring ?

[@peterdewey3395]

Hi Andy, great vid as usual and the bike is awesome. I have a 1000w voilmart kit and was wondering if I change the controller for the 1500w version would it cause any issues and would there be any benefit i.e. more speed. Thanks

[@andykirby]

Voilmart is a hub motor isn’t it? Yes you can increase the power and increase speed by using a better controller like this but your battery needs to be able to provide the power, on hub motors 52V or higher battery gives you a better top speed.

[@peterdewey3395]

@@andykirby yes it is a hub motor, my battery is 48v 13mah at the moment but I am thinking of changing it to the bosch batteries you have used, thanks for replying.

[@undefinednull5749]

Ok, so why not 240v? More volts are better right?

[@Patelking421]

is this good idea to have tubeless tyre for e-bike ?

[@joshuadughi]

Hi; Thank you for your video! In your accompanying documentation, you suggest that the ebike in this video is a Kirbebike - but when I went to the link you provided - all bikes at that link use hub motors and not mid-mount motors. From what I could see in your video, your ebike is one with a mid-mount motor. Can your confirm this, please - and let me/us know which model motor you are/were using? Thank you. Josh

[@Cyberdactyl]

What is the milage playing around like that? Five miles?

[@albertdesalvo7273]

This dude knows his stuff!

[@trippplefive]

you know some shit if you own a lithium ion balance charger thingamabob

[@vladionescul]

how much does it cost to make a bicycle like yours? I have the perfect bike for the project ghost salm 4.9 /27.5 thanks

[@Munzer1977]

Nice ride. How many volts can your motor handle? Can I add two extra cells in series to my 48 volts hum motor? I already got away with an extra 1S which brings me near the 60v range but not sure what would happen if I reach 62 volts. Would my 48v controller or hub motor handle the extra power?.

[@danielcoppock]

Lol already doing 35-40mph unless not satisfied with torque what's the problem with 60v I think 48 is gonna satisfy me indefinitely hahahaha

[@muneeruddin6932]

How should we get the batteries...n stuff

[@maximumsecurity9411]

I need a conversion done on my cannondale? How much to convert 1000watt?

[@Shazzkid]

Chain snappingly goodness

[@dannystrange7202]

Wow really enjoy the video Andy!! I am into enduro, but that looked class, and less likely to annoy anyone haha. I would love a bike like that!! Amazing.

[@FarmerFpv]

Hey Andy If I order this bafang ultra from your store do you think it would work on my fat tire beach cruiser? I'm not looking to beat any speed records its mostly flat here where I'm at in California. Do they make an adapter to fit different bikes?

[@pcgameplay9739]

I've been thinking about getting one of these electric DIY kit for ages but not sure what one i should get. The front wheel ones look to be the easiest to set up but are weaker than the more complicated back and mid kits. Plus my bikes 27 speed has 27.5 wheels hydraulic breaks and aluminium everything as far as i know. Unless i'm understanding the kits wrong and just need to add the motor and electrics to what i already have and dont need to widen the back?

[@marekhlina74]

I have a huge fat bike SURLY ICT with 5.05inch vee 2xl tires...what is Q factor of bafang ultra motor? I mean crank offset/distance when mounted to the motor... Distance should be at least 190mm...

[@dustinperez5341]

Any suggestions on a good prebuilt battery cuz I have no idea what u just did. I need one already done where I can just plug into my covert kit

[@yardenvanpelt]

Awesome build :) fee questions, is this setup still holding up? I also run 4000w as of lately on a bbshd and had the same problem you had I get power cutoff when at high speed (starting at 38 mph) when power cuts off I need to turn down the throttle and then power comes back, my battery is not the weakpoint for sure it's 72v 40a with 90a bms, any ideas what I could adjust to change this? Also what's the biggest sprocket gear on your'e rear? Thank's allot for the vids, hope you see this

[@stephenbrown664]

I have the Ultra..Now I'm on the hunt to find someone like yourself to tweak it big time! Great vid. Cheers

[@Gamen4Bros]

i'm gonna build a 4kW Dirtbike with street tires soon. so this is a good comparison to learn from

[@grishkabernadotte1947]

Would you help me to upgrade my battery on my bbshd 1000w runs on 52v 28ah?

[@hisense123456789]

Set to li-po but the battery is li-ion, can you adjust the voltage on the charger ?

[@josephburch2605]

If I were to single speed a bafang ultra with 26" wheels what gear front sprocket (44?) and rear (16?) would be optional and would it work well?

[@chrisrathjan1501]

Looks like each balance wire is actually connected to two cells. So the measured voltage of one cell is actually an average of two single battery cells in parallel. One of those cells could be really high internal resistance. So it is possible to overcharge one and not completely charge the other but appear to be ok as averaged. Ideally you should measure each single cell. It will probably be fine though.

[@jonezdatonetech2758]

Hey Andy I need your help 🙏, please can you help me find the KV constant for my 3000w Cyclone mid drive motor, and how many pole pairs does my motor have ?, I need these parameters so I can Auto tune my phaserunner.... please help and thank you 😊

[@dalerussell9075]

Nice test mate, that setup looks well rapid. I wondering how your trek rear hub motor setup would perform with that controller and battery. I'm thinking maybe not as good on acceleration but maybe higher top end. Thx

[@andykirby]

That’s a good point, I’ll have to try it, especially on 72V!!

[@rickdavid1795]

Awesome bike. I use 5 4s lipos with 80c discharge rate. Mine has never cutout. I have the CYC X1 Gen2 with a BAC855 controller

[@Dark_Phoinix]

is a bbshd (48v 1000W)overvolted to 72V?

[@shane5001]

How much range do you get out of the 72 volt battery pack?

[@robcoastalga8279]

What groupset is eating all those watts? I'm using a shimano deore 11s at 2500w and it doesn't like it much.

[@aaron1278]

Dewalt 54 flex volt any good for the job?

[@perbackman8283]

Where can you get the bayfang middrive 4000w setup

[@staver76]

Does the torque sensing/ pedal assist still work at 4kw?

[@FlyingFun.]

Are the bikes actually being sent out now if I order one? What is the likely hood of tax cost etc to UK?

[@CaptaiCaveman]

www.cloudsto.com/ebikes/kirbebike-vapour.html

[@kennethford1366]

What do bikes cost landed with taxes

[@FlyingFun.]

@@kennethford1366 I noticed this on AliExpress and asked a few questions to which they replied all everything is paid by the seller excpet "second" tax but they said that didn't apply to UK so nothing else to pay, it was listed £2777 too so seemed a good enough deal to me.... But I'm still skeptical lol, Several things out me off buying it. 1 what warantee is there? 2 will it actually arrive ?? 3 will it be held by customs dormant reason. 4 it's not going to be legal to ride on paths or road in the UK.... It would still be fun to try out but might end up quite the headache if things don't go smoothly...

[@FlyingFun.]

@@CaptaiCaveman I read that already , pretty much taking another chance especially with the anti dumping tax possibly 83% on top of everything else. Better to get these bikes in the EU somehow and ship them from there.

[@kennethford1366]

@@FlyingFun. was informed it would be cheaper to go to china pick up the bike and bring it back on a plane

[@galilejusa91]

hi how mutch this e bike cost?

[@simonstickland5706]

Can u put two 52v battery in sink together making 104v 38.5ah with a upgrade controller thanks mate

[@simonstickland5706]

Using midrive bbshd on a yeti 575

[@andykirby]

Probably not, most battery BMS don’t like being linked in series.

[@simonbarker1932]

That's mental Andy!! 🤪🤪👍👍

[@ΣΤΑΥΡΟΣΓΚΕΡΛΕΣ]

please clarify what is an e-bike? can it move autonomously? like a motorbike? cause till now i thought ebikes only work in conjuction with your legs pedaling , only assisting you. Not turning a knob and accelarate without pedaling. so what is the deal?

[@Lucas-nh2mk]

Top speed?

[@DigitalSamTV]

Incredible, looks awesome mate. I have a bbshd with 52v bat... Any recommendations to get more power and performance from this setup (without changing the battery). What controller or other stuff to add?

[@sean7193]

im in the same boat. did you figure it out? what did you do? are you happy?

[@DigitalSamTV]

@@sean7193 nope have done nothing... It's quite good performance, can get over 50kmph easily. But more would be nice for sure

[@gasmanrus]

Andy what are those square connectors called that you made the series connection with? I’ve just bought a controller that had them fitted with & I’d like to buy the male sides to them

[@daveyjones-sx6ym]

Theyre Anderson power connectors. Theres various styles of them but search ebay for single Anderson connection

[@libertyauto]

Anderson connectors.

[@gasmanrus]

Cheers fellas 👍🏼

[@jameshead8067]

Keep up the good work and hello from Vancouver British Columbia Canada 🇨🇦

[@MetalDetectingOutWest]

I want to build an electric dirt bike from a yamaha 125 chassis. Would the 4kw middrive engine work well with this, or what would you recommend? Thanks...

[@briandhoward6137]

It would, but that's a heavy frame, look at the motor they use in the Surron. Luna Cycle sells the raw motor

[@himezoshit]

Hello, I want to ask on what elements the assembled battery?

[@HighVoltageKits]

Holy smokes. Nice work dude.

[@x0xFaruqx0x]

What sort of parts do you need in terms of the chain and chain ring / cassette ? , cause with a lot of torque of course one will need strong parts.

[@andykirby]

Chain ring is raceface which many mid drive hotrodders have been using in the the last 5 years as it’s proven to be very strong (aluminium that wears like steel) rear sprockets are a problem UNLESS you only use the high tooth gears (25-30teeth) because more teeth are engaged you won’t strip gears, try 3000 watts on an 11 tooth and it will tear it apart the first time, it’s not good to labour the motor like that anyway, best to high rev. Chain needs to be a KMC ebike specific chain, wheel hubs might be a problem but I haven’t come across this yet. I’m looking into using ATV or Go Kart chains, sprockets etc. Soon I hope offer a strong drivetrain for builds like this, with the new high power cells available now it’s great to have a bike that has a decent amount of power but also has an incredible “turbo” mode for those that want to scare themselves 😁

[@x0xFaruqx0x]

@@andykirby Thanks alot for your indepth answer man helps alot, Reason I'm looking into electric bikes is cause I'm doing UberEats deliveries on a bicycle. I'm hoping to be able to get a nice bike setup that can go up to 20 mph with assistance minimum. That way I could bang out the deliveries. :D

[@x0xFaruqx0x]

@@andykirby I'm looking to do like 200 miles a week, so the setup I'll go for e-bike wise ( currently on regular bike) will need to be durable and that

[@x0xFaruqx0x]

@@andykirby Lastly in the UK what about the legality aspect of having a powerful e-bike? :O

[@andykirby]

For Ubereats or any delivery service I would use a hub motor, far more reliable than a highly technical mid drive, what you want is simplicity.

[@ronanoboyle8432]

These e-bikes are getting fast. As a motorcyclist, my advice: Roadcraft - check it out, it will probably save your life.

[@diyelectricbiker9361]

Im ditching my QS205 and getting a Lighting Rods Big Block 8,5kW soon. But as for the Bafang Motor i would get the CYCX1 pro motor.

[@andykirby]

Yes I saw that big block, looks great, I’m wondering what it’s like on the handling because it’s mounted on the swing arm so you still have unsprung weight like you do with a hub, it must be much lighter than a hub though...., it would be better mounted off the suspension. the thing I like about the Bafang Ultra is the all metal gears and the fact that it’s a very neat installation once you find a suitable frame, other thing is you get pedals so it’s good if throttle only ebikes are not allowed in your country. I’ve been doing extensive tests at full power with 4000W and it doesn’t get above 55 degrees which is just crazy. I think it would easily handle 6KW.

[@diyelectricbiker9361]

@@andykirby there are 3 variants of the big block i will get the variant with the 1 stage reduction that will be mounted on the Qulbix frame. The Motor is half the weight of a QS. The Transmission is planned with a Go Kart Chain.

[@andykirby]

This sounds great. That’s gonna rip, You need to make some videos about it! Which controller will you use?

[@diyelectricbiker9361]

@@andykirby i want to use Sabvoton SVMC150. You know the E.R.T. Racing guy uses a ASI controller which is more optimized. But i will try to do this in this way. Building time will be around the Christmas time. BTW my nick is Compoundbike on Endless Sphere. Surely i will put a video.

[@andykirby]

Nice! It will be interesting to see how well it runs with sabvoton, I do rate the ASI stuff, it’s very good but you have to set it up right. Took me 4 weeks to get this Phaserunner nailed, that’s based on an ASI 800. Crazy amount of power for something so small.

[@abaddonknightgames2546]

Is motor working long time ? I mean didn't it damage the wires when up Voltage so strongly?

[@peterwainwright5994]

I've converted a full suspension boardman with the bafang bbshd motor 52v 17.5ah battery, but I've got to say its enough power and speed! ..going over 40mph on a bike frame ,rims and tyres meant for pedal assist seems a bit risky, doesn't feel safe, ..incidentally I was a motorcyclist for many years ie 900cc stuff but feel cycling frames ,tyres etc have their limits? ..what do you think?

[@christopherroberts22]

Now thats My kind of Prototype !! ;) Thumbs UP!

[@irocss85]

So when your applying power, you HAVE to pedal cause the cranks are driven by the motor?

[@andykirby]

No they have their own built in free wheeling gear.

[@irocss85]

@@andykirby ahh ok. That is a game saver. I wouldn't do it if it were like a fixie. Really interesting. I don't mind doin custom work to install, but I don't want to get into custom tuning of the controller, or having to custom build the battery. But mounting it over the rear wheel seems like an easy fix to mount a big battery on any frame. Seems really doable for most people.

[@hawaiiebikes707]

Aloha from Hawaii. I love your videos. I did similar with my bbshd but I have the sondors rockstar on the way and I’m interested in juicing the ultra it has to your specs. I generate a lot of heat maxing out the phaserunner on the bbshd and with the larger ultra I’m sure you’re getting more effective utilization of the power versus more heat. Keep posting brudda! Mahalo 🤙

[@Lea-ww9hf]

That's a fast ebike! Do you use torque arm?

[@sageoz9886]

Lea it's a mid-drive not hub. Bafang g510/620

[@ben150785]

Love it! Nice build!

[@tudorpopescu2061]

what song is it at the end mate? the drop is insanely beautiful

[@tudorpopescu2061]

nvm i just found it music.kzbin.info/www/bejne/aYvFc52ujq90jpo&feature=share

[@andykirby]

Yep! It’s also on Spotify, iTunes etc😁

[@antonoudenhoven7573]

Sick bike haha fun to drive i think. One question is it alowed where you live. Here in the Netherlands 250 watts and 15miles is the max. Ot whit a helmet and insurance 25 miles.

[@lennyrossa834]

same in uk and europe,250watt 15mph, i got a rover,750w and i had to register it

[@antonoudenhoven7573]

@@lennyrossa834 ty for the info. Hope they don't use his videos against him then. Self incrimination they got me one time whit that.

[@girlsdrinkfeck]

@@antonoudenhoven7573 UK police got better things to worry about

[@antonoudenhoven7573]

@@girlsdrinkfeck sad but true. Over here they are hunting for this less important things like bikes and mopeds capable of 5 miles over the max construction speeds. I think uk police is better than here.

[@girlsdrinkfeck]

@@antonoudenhoven7573 ud get pulled over in UK still if u ride like a twat of course. Stay sensible

[@curtismcentyre5878]

How can i purchase one of these bikes

[@hurtluke]

What does something like this cost to build?

[@tmarbut]

I really enjoyed getting half way through the video to discover that while this is happening, you're also monitoring 2m there at the workbench. 73!

[@andykirby]

😁

[@Skinslapper69]

Gotta scan the vhf man, 73

[@DJSpannamanUK]

Hi. I know its old video but I have the same cut out issue and I'm convinced its the BMS. AS these 18650,s only rate @ 20amps so when you Wang open the throttle and pull 80+amps the BMS will shut down

[@rhiantaylor3446]

Very interesting motor/controller. I know the earlier Bafangs used 63volt caps in the controller - do you happen to know what these use - that would set an upper limit on the short-term power capability - that and the gears of course.

[@andykirby]

The Bafang controller has a max of 60V. I don’t think it’s just because of the caps. Here I’ve removed the Bafang controller and I’m using a Phaserunner instead.

[@poketfull]

hi andy, how do you make this road legal (UK)? great build btw

[@andykirby]

Thanks, just turn the power down to 250W and cut the motor off at 15.5mph and pedal like crazy😁

[@poketfull]

andy kirby ah I’ve literally just bought a new specialized levo comp carbon full suspension emtb. That’s mad enough at top speed. Your build looks immense!

[@andykirby]

Nice bike, id actually love to get one and rip the motor apart to do this mod. Those motors will definitely handle more power although I’m not sure if they have plastic gears like a lot of them seem to for the purpose of noise reduction.

[@CAPRAQUEENRC]

If you don’t mind me asking, what is the top speed you reached at 72 volts?

[@warlockboyburns]

people have been reaching 40mph at 1500w so I'd bet it's 55mph plus.

[@Jazzmarcel]

I have a bbsHD and it's my second one since I got the first bike stolen! .....bad decision to lock in a bad neighborhood while in a lecture! I got an idea that it would be cool to get one of those phase runner controllers and the display so I could have a way to switch on the fly from my 48v pack to a small 72v pack in order to have a sort of electrical TURBO switch. I already have 39 Samsung 30q left over from my last battery build so, it wouldn't cost me much! .... Any suggestions as to whether this will work?

[@andykirby]

The best way would probably be to just use the 72V pack and then set the cycle analyst with two power profiles, one for low power (commuting etc) and another that unleashes the full power. A 72V setup tuned down will be better for the batteries than a 48v setup run at higher power (less amps, heat and no need for field weakening to reach decent speeds as 72v creates a High RPM anyway). Keep it simple 😁

[@Jazzmarcel]

andy kirby jackpot!............ 😳 Dam 🙏 thanks for the info and fast reply!

[@solstar4778]

How far at full blast ?

[@wheelerdealer7098]

Sweet.... love it 👍

[@thepuzzlebox6620]

You create an air channel to vent air through the battery compartment. Probably best to waterproof them first though.

[@os2musicuk203]

Thoughts on the BBSHD ?

[@artofblaze]

Great video. Lots of fun. Thanks

[@rcote627]

Great diy ebike Andy!

[@whisperingblues9887]

Fantastic work mate huge admirer of you're builds will have to possibly but one very soon .

[@lemuellaesecle9692]

Hi will the frame hold me if i way 138 kg and was doing off road?

[@RaceActionNL]

It will hold you, but with a higher chance of bending the frame.

[@aaron1278]

Hi mate wondering weather you know anything about the bultaco brinco r ?

[@the.communist]

Underpowered

[@davt8615]

Has loads of torque looks great fun!

[@lee-tx5mw]

ive recently built a downhill bike with bbshd i cant wait to make it 72v i have got a 60a 72v battery ,just need the controller now 👌

[@boostercontrol100]

Awesome videos dude!! So how do you get a bafang motor from 1500 to 4000 watts is just from the bigger battery?

[@ianmangham4570]

By increasing the VOLTAGE and AMPS, Voltage times Amp's equals WATTS

[@yj8471]

Andy can you use Eggrider in conjunction with Phaserunner as you can with the ASI BAC 800

[@MB-hm1zd]

AWSOME bike!!! I'd live to see its climbing abilities!!!

[@joehorridge9258]

How fast are u going mate...?

[@haiderabbas9748]

Battery specs and how much battery will last

[@nortonansell]

Great video Andy. I love my bafang but i'm on my 4th chain in 1000 miles. They last for a while and then twang ! their gone. I think we are reaching the limits of standard mountain bike chain sets with these motors. Can these motors be paired with a Gates carbon belt drive like the GTech ebike(albeit with vastly more power)

[@andykirby]

Wow, what chains are you using, I’m using KMC ebike chains and haven’t broken one yet... hopefully it will stay that way!

[@standbyme6395]

Try motorcycle chains

[@andykirby]

Yes that would be ideal but we need matching chainrings and sprockets. It would be worth trying to engineer something. The freewheel hub is also a weak point at these power levels.

[@standbyme6395]

kirby just ordered a front freewheel crank set for my diy setup. Cant be smashing shins now. Had to machine my sprocket down to size to fit on my motor so hopefully I wont get any skips. Part of me wishes I would have got a kit but the lessons learned are invaluable

[@Harleyfunman]

KMC e9 ebike chain is my new favorite. I broke 3 others before this one now its Bullet Proof as well as a new Raceface chainring and chain guides photos.app.goo.gl/X1jRBk59sU9yVEZh9

[@peterdewey3395]

Hi, do you think that a cheap throttle could limit acceleration or top speed?

[@andykirby]

You’d have to check the voltage sent to the controller at the throttle input and also know what voltage the controller interprets as full throttle. This is the great thing about using a cycle analyst here in this video, you can visually see the voltage, throttle position and output to the controller so you can make sure you are getting a full throttle signal correctly into the controller if not you can just adjust it in either the controller or cycle analyst settings.

[@peterdewey3395]

@@andykirby thanks for the info greatly appreciated