How to swap BMX cranks onto your MTB or dirt jump bike.

[@bimmerbent]

Profile Racing makes many BB for conversions

[@dreweby2580]

Was looking for a video like this for a while currently building a dirt jumper and wanted to swap my bmx cranks onto it

[@dreweby2580]

I’m also building up an octane one lol

[@Dgcamarena]

Drew Eby yeah same here, I need some tips on building mine

[@ianbirkettactionmedia412]

What are you building exactly and what issues are you running into?

[@Dgcamarena]

Ian Birkett Action Media trying to build a dirt jumper but I’m not sure what crankset to buy or sprocket ☹️

[@ianbirkettactionmedia412]

It honestly depends on what you want out of your bike. But if you want quick acceleration like a bmx bike, I would suggest a setup like mine. I've even seen a downhill cassette on a jump bike before. It was actually pretty cool.

[@MrBlawver7]

Thank you for this! Literally was reading forums on what bb to get to fit 19mm spindles!

[@iccyonthelense3225]

You need more subscribers, your videos are amazing quality and great explanation 👍👍

[@iccyonthelense3225]

I’m trying to see what cranks I could get for my norco rampage 2 and I’m had no confident in finding somthing until this vid so thanks 💪🏾

[@ianbirkettactionmedia412]

Thanks! Yeah it took some digging and researching but once I found everything and learned more about it, everything made perfect sense.

[@cesarsoto852]

Great video bmx cranks is the way to go because they are sturdyer than aluminum. I am building a fixed gear freestyle, the only change I will do is that I need splined cranks and sprocket for heavy use and abuse . Thanks for the valuable information.

[@noahcarder5068]

Really nice video, super helpful! Also, Deity no longer makes the bottom bracket that was used in this video, but octane one and Dartmoor both make bottom brackets that will work.

[@Tomenski]

Please tell me which ones haha cheers

[@leojohnladio9161]

Thanks man. Really need this. Hope you make other great videos and godbless

[@Mxman100]

This will hopefully help with my slopeduro build😊

[@Kai-z6h]

That’s what I’m trying to build,what do u have and what specs I’m trying to get ideas for my specialized enduro

[@Mxman100]

@@Kai-z6h dawg the cranks got stuck now I got full sus 🤪

[@llreeves1969]

Great video. Thank you! It is hard to find this information anywhere.

[@ianbirkettactionmedia412]

Glad you found it helpful!

[@TheJessejudd]

Great vid man!, just got a Haro Steel Reserve. The 28t just taps out way too quick. Gotta do sumpin bout that shiz.

[@nazariagile7286]

Nice this really helps

[@diveaddict6885]

Nice I run run Profile cranks on my mountain bike

[@francis1601926]

Thanks for this video m8!!

[@BerserkerNick]

This is awesome, I come from a bmx background and have been wanting to put a tubular bmx crank on my mtb. What tooth width and chain size are you running, also will this work with a 10 speed cassette?

[@ianbirkettactionmedia412]

Awesome! Me too. I wouldn't put them on a trail / Enduro bike but on a dj, its amazing. Most modern bikes are coming that way also I think.

[@BerserkerNick]

@@ianbirkettactionmedia412 where did you order the diety bottom bracket from?

[@ianbirkettactionmedia412]

Diety component's website had the kit. Unfortunately I'm not seeing it on the website anymore. Other company's make the same type of bb tho so if you can't find the diety one, then you may be able to find a other.

[@ianbirkettactionmedia412]

Octane one makes one as well

[@ceedubble3157]

That's the exact same crank I want to put on my bike and you took off the exact same crank thank I have. I did hear you say what problems you had with the mtb crank! Please tell me what problems you had before mess my bike up.

[@ceedubble3157]

Never mind. I sat the beer down and watched the vid again 😅 🙃

[@ianbirkettactionmedia412]

Nice! Lemme know if you have any more questions.

[@zedavia]

Thanks, I've been looking for something stiffer than my gx cranks, and this seems like the killer option. Have you had any issues with the regular sprocket since its no longer narrow wide?

[@ianbirkettactionmedia412]

The narrow wide was actually causing me problems at first because I had a chain designed for single speed. But no, the dartmoor sprocket and the salt sprocket worked great minus the high ratio with the dartmoor sprocket

[@dustinshirley6533]

Can you send me a link to that bottom bracket for sale in Canada BC man or whatever brand works

[@archieroberts4678]

Very helpful cheers

[@sergioc.6431]

Sweet video man

[@ianbirkettactionmedia412]

Thanks!

[@THErickuss]

great video... but why the f would you put chromoly cranks on an aluminum frame, material engineering failure.

[@ianbirkettactionmedia412]

I chose those cranks because I've used them before and I've never had issues with them.

[@Dgcamarena]

I need you advise on my dirt jumper I’m trying to build

[@maxinmontreal5431]

Dude, i hope it isn't too late to get read! What about the spindle size? I broke my cranks on my p1, it was a bmx crank, but every little info i can get is that if i guy a bmx crankset, the spindle will be too short!?

[@ianbirkettactionmedia412]

I'd try searching for an original replacement

[@motov8-garage832]

For a 73mm bottom bracket you most likly need a 6" spindle. Most dj bikes(if not all) with 73mm euro bb require it mine included.(dont believe the parts adds that say will fit 68-73mm bmx because dj mtn bikes have wider chain stays typically). 5.5 which is the most common bmx bb spindle length is too short. My 900$ dj bike came with a 5.5 regular bmx 48 spline spindle and my crank arms kept coming loose every other ride because the spindle didnt protrude far enough into each crank arm, it had enough play to keep loosening up even with taking out half the spacers and having a fairly crooked chain line also the internal bb spacer was to short(needs a 53mm I believe not the 47mm I think is in there).. anyways I'm now searching for a 6" spindle, turns out there not the most common one that comes with a bmx 3pc crank kit but there is a few out there I found. Profile, and some random spindles of of ebay and Dan's comp. -If I'm at all wrong here anybody correct me( I have no problem with constructive criticism)😁

[@blaneysiktube]

I have a Saracen amplitude CR2 with mid type BB. What do I need to do to fit an MTB crankset and chainring?

[@ianbirkettactionmedia412]

You just need to find a bb that will accept whatever spindle size you want to put on. And make sure the chainline is good too.

[@blaneysiktube]

@@ianbirkettactionmedia412 I've just decided to keep as is and ordering a profile 36t chainring instead. It was the lack of speed that was the issue 👍

[@akazbiga5607]

I wanna put bmx crabks on my dirt jumper its threaded bb shell and i wanna buy euro bmx bb ehich is also for threaded,how do i know its gonna fit?

[@ianbirkettactionmedia412]

I believe the euro is the smaller one. You just need to figure out what your bb shell size on your frame is and find the correct size bb. What frame do you have?

[@andrewburnett5428]

Will this fit every DJ frame? As long as it’s the euro style with threads?

[@ianbirkettactionmedia412]

Yep. As long as the bb shell on your frame is between 68 and 73mm wide and you DONT have the super small diameter shell size (Spanish bb)

[@fazlizukamaruzaman7071]

what size that bearing ya?

[@youngsuazo6129]

I got these cranks for my BMX but the sproket I got is like 2 small

[@homebrecker]

Do you think it would work with a 140mm spindle instead of the 150mm I’m pretty sure the mission has? I want to do it with a splined sprocket.

[@ianbirkettactionmedia412]

Idk, I guess it would depend on if you could get the correct chainline. Plus you would need to be sure your crank arms have enough spindle to attach to. You wouldn't want your crank arms hanging half way off your spindle.

[@dane_mtb]

I have seen that you can no longer get the deity bottom bracket. Is there any other bottom brackets that would work?

[@ianbirkettactionmedia412]

Not sure, it took me a while to find that diety kit I had.

[@martystephens6929]

Looking to get back to riding after many years of other interest... my ? Is do you know where i might can pick up a frame for cheap for i am just an older vet on a budget. I know i want something with the bmx style dropouts and for 26in but options are open as i starting fresh. Thanks

[@ianbirkettactionmedia412]

I went the same route and picked up the octane one zircus frame from chain reaction cycles. But I recently finished my nukeproof scout build and I like it a lot more! The scout was a little more expensive but well worth it. I would suggest going to chainreactioncycles.com to find a frame. Bike24.com has several options as well.

[@martystephens6929]

Ian Birkett Action Media thanks i will check them out

[@Adrian-yn8iw]

Does anyone knows which other brands offer this kind of BB?

[@ianbirkettactionmedia412]

FSA does. I almost got theres instead. Glad I went with deity though.

[@xXmartypooXx]

you sound like Randy Santel 😁

[@guillaumebarrette9040]

7:25 for the 30 second KZbin shorts version

[@owenjohnson8521]

Would a 24mm BMX spindle fit a MTB bottom bracket?

[@ianbirkettactionmedia412]

I suppose you could put whatever spindle you want on your mtb as long as its the correct length and the diameter of the spindle will work with your frame and your bb bearing size.

[@Kai-z6h]

How do I know how to measure and know?

[@Betoofast]

do you use a standard dirt bike chain?

[@ianbirkettactionmedia412]

It was a typical single speed chain. Something that you would use on a bmx bike. If you manage to get your chainline perfect, you could go with a half link chain as well.

[@Betoofast]

Ok thanks Bc my chain is always slipping and i don’t really know why

[@ianbirkettactionmedia412]

No problem! Honestly, the chain slipping is more than likely a bad chain line. As in, your driver and chain ring aren't in a straight line relative to each other. That was one of the reason I made this video and went to the setup that I did.

[@codrinnnn]

I have a question, i got a 73mm bsa, threaded, and got a dartmoor bb set, are there any chances that the spindle will not be long enough? Or i am just anxious? I want to get the same cranks that you got.

[@codrinnnn]

73mm bsa threaded, 19mm inside from dartmoor**

[@ianbirkettactionmedia412]

I think you would be fine. I think most crank spindles are usually longer than the bb anyway. You'll just have to make sure that you have spacers.

[@codrinnnn]

@@ianbirkettactionmedia412 spacers on what like inside the bb set to put the 2 things on the parts, or for the spindle?

[@codrinnnn]

i mean like you showed some spacers to make 68 go to 73, is that what you are talking about or you re talking about putting it on the cranks spindle/axle?

[@ianbirkettactionmedia412]

The bb you have should already have spacers on it between the bb and the frame. Then you may have to add spacers between the crank arm and the outer face of the bb so you can get a good chainline. Sram's website had a good diagram to explain it better than I can.

[@sergiogutierrez6091]

So how do I do this on a frame that has the bottom bearings pressed in ? No threads

[@ianbirkettactionmedia412]

I've never heard of or seen a jump bike frame with a pressed in bb. That's a new one for me. Sounds like a custom job to me, or maybe a new frame 🤔

[@jbear9989]

Ur trying to put bmx style cranks on a dj with a mid bottom bracket? My verde has mid bottom bracket with press fit bearings, 19mm spindle

[@TheJessejudd]

Btw, tell the ladies not to give ya such a hard time.🤣

[@ianbirkettactionmedia412]

I'll do that 😆👌

[@tobypeters6243]

What do I do if I have movement from left to right ?

[@ianbirkettactionmedia412]

Make sure your cranks are tight and if you still have play in them, make sure you have the right spacers between the drive side crank arm and the bb shell (frame)

[@martystephens6929]

If you are running 25t on front, what do you have on rear?

[@ianbirkettactionmedia412]

10t driver.

[@m_craig]

@@ianbirkettactionmedia412 i was reading a website about "gear inch" which is an indicator to use when selecting gearing ratios: www.sheldonbrown.com/gloss_g.html#gearinch . from this site it shows a calculation you can do to make the gearing feel the same for different wheel sizes. Profile says that the typical "gear inch" measurement should be 55 so for a 26" DJ a 25x12 would feel like a 20" BMX bike with a typical 25x9 configuration.

[@senpaimiggy9321]

Tnx bro

[@harveydecastro339]

Shout out lods

[@joepilinski549]

What length crank is that

[@ianbirkettactionmedia412]

165mm

[@m_craig]

you should only lube moving parts, putting lube over threadlocker defeats the purpose of the threadlocker.

[@ianbirkettactionmedia412]

Live and learn I guess. Although I've been a mechanic and maintainer all my life, I have very little experience on proper bike maintenance. Its a process.

[@antonfian8091]

How diameter bb?

[@ianbirkettactionmedia412]

Applicable spindle diameter is 19mm. The thread diameter for this bb is the American size. www.bikeraceinfo.com/tech/bottom-brackets.html

[@diveaddict6885]

9/16" pedals