Converting a One Piece Crank (American BMX) Bottom Bracket to BSA
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- čas přidán 21. 07. 2024
- I'm currently converting an 90's steel framed MTB in to a Modern drop bar gravel bike but wanted to swap the American BMX BB out for a more standard BSA style one. This video will show you exactly what kit you'll need to do it yourself and the full process.
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Cool, didnt know such adaptors existed. The Ashtabula cranks were really heavy, one could save a lot of weight going to a 3 piece crank.
That being said, the Ashtabula crank was genius in that it could be serviced with no special tools, just a crescent wrench which everyone has. Although ironically probably 90+% of the bikes ever sold with such cranks were never serviced in their lifetime and served their whole time with the grease and adjustment that they left the factory with :)
In fairness, the cranks still spun really well, so I actually could have left them be but I preferred to bring them a little more up to date.
As you say, it saves a lot of weight too.
Thanks for watching and commenting. 👌🏻
i almost threw away my fixie frame bcs of this problem, have a blessed day 🙏🙏🙏
So glad you found it useful and didn't needlessly throw your frame away! Good luck with the rest of your build. 👌
Great vid, Macguyver!
😂. Cheers mate. I try my best. 😉
Great video Peter. It’s been a few years since I’ve seen a one piece crank, I think it was on an old Raleigh Grifter! 👍
Yep, they’re definitely a dying breed but good to know they can be updated when you do come across one.
I used to have a Grifter too though. Couldn’t quite afford a Chopper but I loved that Grifter. 👌🏻
How did you determine the width of the shaft? Nobody ever mentions this or talks about this. It's important especially if you plan to keep the same number of chain rings in the front.
That’s a good question, Luigi and I imagine the reason no one talks about it is because there are a few variables that go in to it.
The first thing is whether it’s a JIS (Japanese Industry Standard) or ISO (international Standardisation Organisation) which are mainly European made. The difference between those two is the angle of the shaft ends where the crank attaches. One tapers much more than the other and so your crank may sit closer to or further from the BB dependant on the type.
Secondly is the size of shaft that your specific cranks need and this is the hardest part, as crank manufacturers rarely (in my experience) list what size shaft is needed for their products.
As such, it’s all largely trial and error frustratingly!
I hope that gives you a little knowledge to do a little bit of Googling, to get closer to what you need when you’re looking for a new crankset. 👌🏻
@@petertreadway Yeah I know. All's I know is that I'm in America so other than that your guess is as good as mine if not better. I don't want to spend my life on Google. Lol I'm actually trying to get away from computers as much as I can.
@@petertreadway Maybe if you and they mentioned what you went with and why it would help other people instead of leaving it out.
Terrific and informative video! Slight criticism; you need better lighting. It appeared as though you were working in the dark.
Cheers Pat, really glad you found the video useful. You’re right about the lighting too.
This was my first ‘studio’ video and so didn’t have the lighting settings properly dialled in, so have since tried to change it up a bit.
Really appreciate you taking the time to watch and comment. 👌🏻🌟
I will be doing this conversation on my 1972 Schwinn Super Sport. I can’t believe it is this easy.
@@patreilly4293 I honestly thought there’d be more to it but nope, take the one piece out, fit the adaptor and screw your BB in. Simple!
£16🫖 or about $60🦘😭
Wow! Is that how much they are in Oz?!? Sorry dude!
@@petertreadway Everything is more pricey, not to mention slow and expensive to ship 😒