This new Brompton E-bike Conversion kit is TINY!

Calling all Brompton fans!
E-bike conversion kits are making waves in the e-mobility landscape right now, and Boost have just released an exciting new product for the famed electric bike brand Brompton! Join me as I give you the rundown on this particularly tiny conversion kit hidden in plain sight...
Pre-order yours now for up to £400 off!
boostbike.uk/projectlondon
0:00 Intro
0:57 The elephant in the room…
2:07 Spec
4:02 Assist modes
8:23 No assist test
9:24 Display kit tour
11:32 Hill test
13:11 Real world range
14:02 Pricing
15:00 Outro
#electroheads #boost #bromptonbicycle
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[@derekwaudby5899]

The problem for me with this Boost kit is the fixed battery. With a Swytch kit you can change the battery very easily. I carry one or two spare batterys increasing my mileage by double or treble.

[@kcdiazWTV]

That's awesome. I will be supporting their project.

[@stillben]

Good review, covered all points thanks

[@earlbee3196]

Just picked this up today, Giant Electric bike Fathom E+ 2 Pro 29 2024 gunmetal black, I also have a Brompton and would like to get that power assisted , So your video is super helpful .

[@Rabe1907]

Heckmotor, klasse, jetzt noch in 20 Zoll mit 7 Gang Kettenschaltung , hydraulische Scheibenbremsen, Federgabel, gefederte Sattelstütze und es ist meins ! ❤ Ach, jetzt fällt mir auf, so etwas habe ich ja schon 😂 !

[@robertneild3772]

Interesting, but losing the 3 hub gears is unfortunate.

[@pootlingalong8928]

Love the neatness and simplicity, looks good. However, I certainly need a far bigger range as my Brompton regularly carries me between 15 and 39 miles, sometimes more. I like what you’ve done and will be interested to follow as the kit evolves 👍🏻

[@robertpatrick3350]

The loss of the rear gearing is off putting…… however the battery packaging is genius…. If this was combined with a front motor then that would be more elegant

[@bonzobanana1]

There is a lovely simplicity to this conversion and the backers price seems great but like you I feel the loss of the hub gearing is a big issue. Also some of the other conversions with front hub motors allow easy swopping back of the original wheel and removing the battery so easy to switch back and forth between normal Brompton and ebike which I think is a great feature. Lastly the Brompton has twitchy steering and some people seem to like a little more weight on the front wheel with the hub motor and battery above. Actually I've just thought about one other issue, when you have the hub motor at the back the spokes end up being very short so the rear wheel will feel more harsh and less forgiving and that is where most of the riders weight is. You can get away with that more on the front. So overall I feel a front hub motor is a better option for a Brompton.

[@macanic5161]

I love unelectrified cycling, and I love my Brompton as it is - simple, light, worry-free, long-lasting, independend from any power source.

[@Ewald240]

And you add “only” 2.5 kg … that is almost 20 percent extra weight. I like it now.

[@Loostyc]

What kind do you have?

[@taber247]

I too love the feeling of just cycling. Having the e assist is definitely motoring. Thanks for sharing.

[@My-Decaf-Journey]

You missed a critical point about how the Boost kit is fitted and why it breaks the warranty. To fit the Boost kit, you (or the fitter) MUST expand the rear triangle a few millimetres and this is only possible by unnaturally forcing the rear steel triangle. This also explains why this bike has no mudguards since you can't fit them once you fit the Boost motor.

[@carolineholding]

As far as I know, fitting any kind of conversion kit to your Brompton voids the warranty.

[@My-Decaf-Journey]

@@carolineholdingit does indeed, but expanding the rear triangle is not just a warranty issue. What would happen if it would cause a serious issue to the bike or the rider down the line? Since this is a new kit and not many or zero people on the road/tested, I would’t expand my rear triangle and take a risk

[@mikea7174]

Thanks for that extra “boost” for my day. I commute a great deal on my Brompton. I’m sold! Thank you. 🙏 my friends are extremely excited about this. Cheers!

[@Electroheads]

Our pleasure! Hope you enjoy the kit, it's amazing what they've achieved with it

[@joechamma]

As a Brompton owner, this is awesome. Thank you 😍😍😍

[@tortinwall]

Hannah on the Brilliant Bikes KZbin channel has just done a very good review of this. Well worth watching.

[@Trump2024TheOrangeHouse]

If you get a chance a review of the Arcc would be wonderful!!!! Thanks

[@NotNoord]

Looking forward for a similar conversion for P-Line!

[@boostbikes]

Good news! We got hold of a P-Line yesterday and the battery pack fits without any changes into the curvy triangular uprights. We will likely provide special fitting pieces for P-Line bikes for the most secure fit possible. The P-Line axle is also a little wider than regular Bromptons so we'll make sure our new motor has a long enough axle. We can also definitely fit the 4 speed sprockets as used on the P-Line. Exciting!

[@yoltmb]

Ms. Barrett, you look lovely and beyond riding that Brompton. Thank you for your hard work and insightful comments.

[@Electroheads]

You are so welcome!

[@kavanobrien6547]

The whoosh kit is £499.00p British company phone call away ring them Monday get it by Friday , keep the gears you have already no need to change gear set up, mentioned before this company somewhat surprised you haven’t featured this British company , who knows you might have this in mind for future videos.

[@gustavorodriguez2745]

nice video is this e bike waterproof?

[@finncarlbomholtsrensen1188]

As a now luckily much former owner of a 1966, new BMC Mini, "British Made" isn't exactly what I would name as any kind of an asset (Even from the corners of the front screen, water came in, as from many other places!). But my now rather much rebuilt and more/actually much less than 2019 "Superlight" M6LXBrompton (9 kilo, mudguards) could be nice with a little assisted ride, as the small wheels are rather Heavy Rolling! But the small battery can't give much of any assistance for its small size and the extra weight of the motor? I have just sold my Makita, Power assisted folding bike and the help from the two 18 volt Tool Batteries was rather minimal for more than a short distance! Finn. Denmark 🤔

[@sandydennylives1392]

As a 2 speed owner I feel it would add too much weight for analogue cycling and the 8% limit means the 'tain's might be impossible, but it looks sturdy enough for terrible London roads, and it's a step in the right direction, just not removable and the rear triangle has thin steel and I'm at the rider weight limit. The 2 speed is for speed and I'm going over 15 mph 90% of the time as it is.

[@martincook7195]

Not enough range for me, and would not be much good on steep hills around here without the gears in rear hub. Happy to stick with my Nano conversion on a 20 year old 6 speed.

[@richardajoy79]

Have too many hills in my town and they're definitely way above 8% gradient... need some extra torque in a motor to help power through that without having to huff it, which is a shame cos the boost kits are a good option over some others.

[@phillblake6829]

This looks great Already looking for a second Brompton to convert

[@boostbikes]

We've picked up a couple of 2-speed Bromptons for use as demo bikes from Marketplace for around £650; anything made in the last ten years or so should be fine and we'll provide specific measurement instructions for very old Bromptons. Some super old ones may have 9mm axle slots whereas modern bikes (and our motor) use a 10mm slot.

[@deepindercheema4917]

@@boostbikes I have a a super super old one as it is probably delivered in 1981 as the Sturmey Archer hub is May 1980 so I will have to measure out of curiousity.

[@weircottage]

I have Swytch with big battery and a ‘flight safe’ 95 wh. If the battery is not easily removable this is a problem for easy charging away from bike and removing for taking the bike, non- electric, on a bus where now annoyingly banned. Replacing existing gearing also bad. Front wheel much easier to swap to non electric when taking on a plane as we did before the small battery arrived. Think Swytch have nothing to worry about. Have loved the kit and would 100% recommend to any Brompton owner.

[@erwanmirabeau6751]

I have the E P Line. Was wondering adding the Boost kit = Rocket ! 🤣 (Joking : too dangerous !)

[@th42]

Have gone for a swytch conversion - uses front wheel - not so complex to swap. Have the small battery which I’ve found is good for about 13km but it’s utterly brilliant.

[@LiveSteamMad]

Swytch conversion seems to use a motor that is specific to only their Brompton kit, and appears to have significant rolling resistance when the electric assist is off, compared to the much lower rolling resistance motor from the "real" Brompton Electric

[@boostbikes]

The Boost motor uses a 'spragg clutch' in common with most geared e-bike motors so the resistance is practically zero when the system is off. Eilis talks about resistance in the review but we think she's talking about the natural resistance/drag from the bike. Spin the real wheel with the motor off and it'll freewheel as you'd expect from a non-motor hub. We've not measured the drag from a Swytch hub but several people have commented that it has drag.

[@whitefalconcruzer]

i’ve also got the Swytch Air on my Brompton and was puzzled why it gives up after only 12km on flat terrains on light mode … thinking my battery was faulty. do you think it’s like that for all batteries for Air?

[@LiveSteamMad]

I can do a round trip of 20Km where there are continuous steep hills up and down, on my Decathlon Elops 500 electric bicycle used on "Eco" setting, with it's 26" wheels and cheap parts and 6-speed Shimano derailleur with 24V Geared Hub rear mounted brushless sensorless motor and a 6 year old battery with it's 192 Watt-hour nominal capacity rating, 24V battery with Samsung cells, and have a couple of bars left on the controller LED display (I am 55Kg rider and not very strong), compared to the brand new 90 Watt-hour Swytch Air battery on a Brompton, where the Brompton is about 20 per cent less efficient to start off with when comparing an un-assisted Brompton with a regular 26" wheel unassisted bicycle. I am assuming that my Elops battery is only giving maybe 170 Wh instead of 192 Wh because it's done hundreds of cycles, and that I only used maybe 150 Wh because I had some left. So on the 26" wheel bike I am getting a consumption of around 7.5 Watt-hours per Km, and on your Swytch Air Brompton you are also getting 90 / 12 = 7.5 Watt hour per km, so you are consuming the same amount of electricity per Km, even though as you say you are on flat terrain and I am definitely not, but bare in mind that the Brompton is less efficient than a 26" wheel bike because of it's small wheels making the bike jump up and down over bumps instead of riding over them, which looses energy. Also, the brakes always seem to drag sometimes on my Elops bike no matter how I adjust the V-brakes (they won't recentre properly every time, sometimes they get "stuck"), whereas the brakes on my Brompton are much better and never have drag. Also I am using Marathon Plus tyres on my Elops, which have some rolling resistance compared to the Marathon Racer tyres on my Brompton. So I think that you are getting just a little less than the expected range from your Swytch Air Brompton, since Swytch claim a 15Km range for the Air battery on the Brompton Swytch electric kit. Do your Brompton wheels always run freely or is there any drag from the brakes?, and what tyres are you using and what is your rider weight and how strong are your legs? @@whitefalconcruzer

[@mranonymous8815]

What brand and model is the brown saddle on her Brompton?

[@seanweirdbeard]

Great Review!

[@stuz32]

Titanic reference gave me a chuckle ha ha

[@SIGNALacquired]

Curious questions: What does four rings on the left hand fingers mean ? Left thumb, left index, middle finger, pinkie finger ? Also is the ring on the nose reserved for the one finger on the left hand that does not have a ring ?

[@logtothebase2]

How easy is it to charge, given the battery is fixed to the bike, can I use my phone charger to top it up at work?

[@philw4625]

While the Brompton in house offering has its flaws, it does at least manage a respectable range in proper use. If you use it as a holiday bike to go in your camper/motorhome, range matters. Standard one manages between 25 miles in extreme hills to 35+ on more moderate rides, and because it has 6 speeds its better at hills so you use less battery. This would be good for city use but you cant take the battery off to charge presumably, so perhaps a downside?

[@deepindercheema4917]

Does the kit supply you with a completely new back wheel?

[@jonabub]

we have bought the top bike kit on aliex... and it works like a charm . the only issue we have is where to out our batteries, we have too many options on this marvelous machine. and since it's a kit, we can use the same battery as on our other bikes, no proprietary problems whatsoever. and the price point? without battery it's a third of this one and since this one only has a small battery it'll be half over all in the worst case.

[@Mustafa-ri7gz]

link pls I bought an Aikema front engine for Brompton, I am very happy with it, I was wondering about your rear engine choice.

[@whitefalconcruzer]

hi thanks for the coverage! quick question: how do you charge up the battery when it’s fixed on to the bike itself?

[@Electroheads]

There's a little charge port accessible on the battery, so it's easy to charge!

[@MikeMu]

Wish they would ship to the US.

[@ZirothTech]

Great coverage of this guys! Absolutely love this conversion, and after speaking to Nick (Boost founder) and hearing his passion about it all, I know this is going to be the best Brompton conversion kit it can be. The 20km real world range sounds reasonable considering the use case of the Brompton - the battery could easily be charged just about anywhere you stop anyway as it isn't much bigger than my power bank 😅

[@boostbikes]

Thank you so much for the support! We're excited about putting the final touches to the system and seeing lots of them on the roads next year.

[@boostbikes]

We've deliberately configured the battery charge port so that you can add an auxiliary battery - possibly mounted on the rear rack. This allows you to keep the main battery topped up for greater range. If there's a proven demand for an auxiliary pack we'll create a battery-to-battery charging mount for our full-size Boost battery @@cgi2173 🚀

[@tomquimby8669]

I like the white RODE. good vide. bromptons rock I have had 4 over my commenting journeys. maybe it's time to sell my last one.

[@kzarz0219]

I think it's great for those who live and work nearby. Most guys I know are focused on speed and range so this would be a niche market.

[@iainamurray]

Except it’s a Brompton so you have the multimodal transport option. I go hundreds of miles with my Brompton and hardly any of them involve me pedalling!

[@gfabie4901]

Bringing this on a plane would still be a problem? Or have airlines made some allowances?

[@user-br6js9ky4s]

how to install in Bromton? I saw the homepage, motor width is 135mm, but brompton rear fork width is less...

[@ahkl77]

Gotta replace both chain & rear tyre more frequently.

[@letesaaviles9641]

How are you filming this tho?

[@Alessandro---]

Hi there ... great video again BUT you said you were going to put links for Boost and the campaign ... reason I ask is that I looked for the other Boost kit you showed in a previous video, and ... Paradise Bikes don't have it on their website! On a different topic, I don't understand whether you're going to be able to keep the Brompton derailleur and cassette, or if you're obliged to stick to the 2 gears (lo/hi) which wouldn't be very useful in Shrewsbury ...

[@LiveSteamMad]

The choice of the rear geared hub motor instead of putting the geared hub motor at the front means that I loose 3 of my gears?! My Brompton, like many, has an internal 3 speed rear hub. This kit struggles on a 10 per cent gradient that I live on, so it's not for me.

[@Mustafa-ri7gz]

Hello, My front engine recommendation.; many brands actually use this aikema (AKM85SX(F1)) motor in electric kits used in Brombton. It is a motor that does a really good job according to its weight. KT supports serial controllers and lcd's. I collected it myself, I am quite satisfied. The brand you bought loaded the battery directly on the handlebar, which is not a good situation, the handlebar will become cumbersome. However, I think there is kunteng (KT e bike controller) in it, maybe you can improve it. Note, if you buy directly from a Chinese shopkeeper in the form of a kit, the engine and controllers cost 200 dollars excluding the battery, you can probably get much more affordable in different countries with Turkish taxes.

[@ziggarillo]

The extra weight at the front adds stability to the sometimes skittish handling of the Brompton, I have one e Brompton and 2 standard ones.

[@markotrieste]

I agree, no problem at all with the weight on the front.

[@davet3804]

Me too , totally agree. Also I can perceive no rolling resistance on E Brompton and easily get 30 miles on a charge.

[@Flysarse]

Surely a swappable battery system would be optimal.

[@normanwray1341]

Hello dear friend I buy one of those brushless convertor moto ebike kit and I hope me could fixed it up thanks for your help too😅😊

[@Moonrakerd]

this thing needs to have a US firmware with 20mph as on this road you will be behind half of normal bikes :D

[@danieia4029]

Sacrificing the hub gear 😮

[@Me_and_My_B]

Its very light.......and neat. A few disadvantages too like 2 gears only, but maybe worth trying out.

[@boostbikes]

The loss of hub-gears will be a negative for some people, definitely. From using the Boosted bike with 2-speed gears (same ratio as a Brompton 2-speed), the motor does a great job of making intermediate gears unnecessary because you just get going in the low gear and cruise in most conditions in the high gear, assisted by the motor. We believe our new motor is compatible with the new Brompton 4-speed setup so will provide info about that soon.

[@Me_and_My_B]

Can you please give myself details of the battery? I can't find the capacity in WH.... Many thanks

[@devjon123]

Before spending your money on this I'd take a look at the review that the excellent Brilliant Bikes KZbin channel did whewn they were sent one for review.

[@slicedpage]

oh goody, let us make the front wheel even more skitsy

[@edumardel]

😍😍😍

[@tranderrick]

Yall are not seeing the possibilities, this combined with the brompton electric would provide a 2 wheel drive speed monster.

[@zygmuntthecacaokakistocrat6589]

I think a battery size option would be a good idea, as would be a hot-swappable pack in and out of a shoe.

[@boostbikes]

The battery pack supported an auxiliary battery; if there's demand we'll produce an auxiliary battery based on the Boost system battery used in our full-size bikes :)

[@MegaWilderness]

If it replaces your gearbox, it's no good

[@gazzaman28]

Losing the 3 speed hub gears is a deal breaker, unfortunately.

[@petergilbert72]

As stated in the video, not having to carry a battery separately on a train is a distinct advantage for this model though the battery looks to be rather exposed to damage when the bike is folded, jutting out at the back. Is there a reason why you can only have a two gear derailleur with this, and not Brompton’s four gear for hills - two ‘speeds’ isn’t much particularly if it has a draggy motor? It doesn’t appear to offer immediate accelerative assistance leaving the traffic lights except perhaps in ‘super boost’ but it still seemed to require a few turns of pedals to kick in. But without doubt it’s a neat and relatively lightweight electric conversion.

[@boostbikes]

We're pretty sure that the new wheel will be compatible with the new Brompton move to '4 speed' derailleur system - more news on this as we have it. It also supports a larger big sprocket when used as a 2 speed.

[@simonscott8183]

@boostbikes P Line and T Line owners have the 4 speed derailleur system with same identical titanium rear triangle (different from the all steel bromptons) - if make your kit fit these bikes and I’ll seriously consider it for my P line.

[@boostbikes]

@@simonscott8183 we're pretty sure it will fit P-Line bikes; we're visiting a highly respected Brompton shop on Monday and will check the battery pack against a P-Line rear frame. We're also going to check out motor design against a 4-speed external shifter as on the P-Line - also should be fine and we'd supply the Boost system with 4 sprockets.

[@TheChopcat]

Having converted mine with a Grin front hub the battery size shown here is going to nowhere near useful enough in the real world. Making use of the pannier mount to accept add on batteries would be useful.

[@edwardott7239]

🥰😘❤(Cranes WAY up to give the beautiful towering Eilis big (hugs))

[@larshelmin]

15:12 I feel offended by that remark as a Brompton owner! 😤 That one hit to close to home 🤣🤣🤣

[@Electroheads]

I'm sorry but it's true!! 🤣

[@cyrfung]

Was she just being nice or is the battery voltage display actually preferred by some?

[@Electroheads]

I genuinely prefer it

[@cyrfung]

@@Electroheads Doesn’t battery voltage drop as a curve and still not very predictable as to when it’s going to die? But I guess the three segment style battery level isn’t very helpful either.

[@keithwhite9978]

There's thousands of illegal bikes in every city in the UK

[@RobertLaussegger]

I think Brilliantbikes has a much less enthusiastic review. The motor is too wide for the rear triangle (hence the warranty issue), there is no torque sensor and the range seems to be much less than advertised. And given the mentioned retail price of 990 GBP (with or without installation??) it's even not much cheaper than a "real" Brompton electric. I personally wouldn't buy either of them but I think reviews should be reviews and not (paid?) advertisements.

[@garyseckel295]

Agree. Torque sensing is superior to cadence sensing.

[@Rumblefiah]

Love your jacket

[@LiveSteamMad]

That blue bike appears to be a clone copy, not a real Brompton?! But it's probably close enough to test with. I am interested in the kit, but I would need it to work with my H6L with it's 6 gears, as I live on a hill, with many other gradients around me. A pity that the price seems to be 2x what the Swytch kit is? I hope this Boost kit uses a motor with very low rolling resistance when the electrical assistance is turned off and you just want to pedal in the normal way?

[@petergilbert72]

If you watch the video it says the Boost is unsuitable for gradients steeper than 8%, and the motor is a bit draggy if you cycle without motor turned on. Lots of hills on one ride would quickly drain the small battery. For info, the Brompton Electric’s motor is powerful and suitable for hilly terrain and it’s not draggy at all - but it’s only available as a complete bike.

[@boostbikes]

It's a real Brompton - bought as a stripped frame and we repainted it and rebuilt from parts, hence looking a bit non-original. To confirm (despite possible misunderstanding in the video) the rolling resistance of the motor when switched off is practically zero.

[@LiveSteamMad]

The "Nano" Brompton electric bike kit uses a motor which has 5x the rolling resistance of the non-electric Brompton front wheel, and requires you to remove the bottom bracket assembly in order to install the pedal cadence sensor! So I think I will have to go for the Swytch kit, despite it's draggy motor... @@petergilbert72

[@RoadtrekRich]

Spreading the rear triangle to mount the rear wheel with motor voids the Brompton warranty. It isn't reinforced like the fork on the electric oem Brompton. No thank you. Less expensive. And a compromise for those who own a conventional Brompton...maybe worth considering for short range trips. Battery doesn't have enough capacity for long range uphill rides. Lightweight riders will enjoy more benefit from this aftermarket kit versus heavier riders. Overall, mixed feelings. Price? 400? Well, it IS a more economic solution. But NOT a Brompton electric.

[@borisbadinoff1291]

So in a 15-minute video, you couldn't find the time to simply show how the Boost gets recharged? It's electric, no? Do you carry the whole bike into your appartment and plug it? What if you want to leave the bike in the basement? Of course, can't find much details on Boost's website about this...

[@taber247]

The " Last mile" association with Bromptons has long been disproved; so is inappropriate. And as a justification of Boosts limited battery range, also unjustified. Had Boost accomodated a swap in and out battery, carrying a spare would have doubled the range etc.... So easy to fit ones self!? But one comment pointed out the Rear Triangle needs streatch apart. HELL NO !!

[@LaurenceRutherford]

Giving up your Brompton 7 year frame warranty seems a big price to pay. At £1k plus the cost of a Brompton it would be better to go with the official Brompton electric... But for people with older Brommies then maybe..

[@boostbikes]

Thanks for the comment. We (Boost) will match the original Brompton frame warranty so there's no loss of warranty support when installing this system 👍

[@szilardmartha6006]

Rim brakes on ebikes. So f no c😮😮l. 😁

[@LiveSteamMad]

The standard Brompton brakes on their non-electric bikes are VERY effective, almost too effective I find. In the dry, at least, not tried it in the wet so far.

[@SkyLee-ng1fp]

Manufacturer for Electric Bikes in China

[@Phil535]

IP54 is safe against just splashes and washdown is not recommended. #Fail

[@remussebastianmadmax5816]

shrot my brompton it top , 45 km /h 😂😂😂😂😂 no limit, ha ha ha ,

[@markhuckerIOwnAClassic-xd6qp]

its a load of old w@nk! is what it is... you gotta stretch your forks to fit the wheel, you cant for a mudguard, because it blocks the bb chain stay, in the valleys it wont do 3 miles, costs an arm and a leg and you cant keep it on boost for more than 10 seconds.

[@TheKos2Kos]

Does this youtuber not know that bromptons are engineered to handle better when you put a bag on the front bars versus no extra weight on the front bar. #criticallythink

[@pxg812]

с такими втулками маленькими и тугими дальше магазина на соседней улице не уедешь что мне нравиться в этом велосипеде - только классический зад у женщины как всегда седло слишком высоко поднято

[@kennethware9729]

Brompton are ridiculously over priced

[@EVUK-bd2vn]

..and if it's a bike like the Brompton you know that the extortionately high , posh-price is gonna be as hidden by the presenter/seller as this kit itself is hidden. Paul G

[@teaforthree1]

Lovely professional presenter but 8% gradient isn’t a hill. This thing is neat but pretty useless

[@Zebsy]

All the cuts makes this hard to watch, so I gave up

[@gazzzzza911]

To be the saddle...

[@SirHackaL0t.]

Because a Brompton is so cheap.

[@keithord8356]

The brompton battery only adds 2.5kg of weight to the standard bike, so there's no benefit to this kit at all, considering you have to have the bike near a charger to charge it

[@tonyc9035]

@3:29 "All the kits are built in UK" "Kits"... Motor from China?? Assembled in UK?? 🫢🫢