Truvativ BB and Bulletproof crank problems!
Well, I've been riding my recently put together fixie for about six months now and have been dealing with a chainline issue. But the noise finally got to me and I switched the bottom bracket today.
Bullet proof crank set with the chainring on the inner spider
According to Sheldon Browns (RIP) site I would have a chainline of 39.7mm with a 107mm BB.
So I used a 108mm truvativ one and the chainline came out real close to the calculated 40.2mm. 40mm by my ruler.
So I went in search of a 112mm BB at the LBS and they gave me a 113mm Truvativ. Well i threw it in and voila. No change in the chainline! That I can tell at least.
But the non drive side seems further out. I'm assuming that this is some mountain bike application and not what I need.
So my questions are.
Should I just try to make a 2mm spacer to put on the drive side cup?
Or should I get a new BB? If so what are you guys using with bulletproofs to get a 42mm chainline?
Thanks a lot.
You didn't, like, put the BB in backwards, did you? They're asymmetrical - the drive side is longer.
Originally Posted by dmg
there should be an "L" and "R" marked on the bottom bracket to show which side it should face.
It might just be the longer spindle that makes the non-driveside crank arm stick out some, is it causing any problems other than aesthetics?
Originally Posted by metaljim
The drive side cup is made onto the BB itself. i assumed you couldn't put it in backwards. I did put 2mm worth of spacers on the drive side today and it helped a lot.
where did you get those spacers I want a decent chainline with a set of bulletproofs that I am going to get. Also how is the bottom bracket working out after a few months.
partly metal, partly real
i don't think you can put that bb in backwards; it's english threaded, and the drive side cup isn't removable.
Originally Posted by bonechilling
Bulletproof+sugino103 with 3/32ring on the outside(45mmCL)+1/8 chain and cog =non noisy drivetrain
wow this thread helped alot. i've just encountered the same problem. i thought when i switched from a 107mm shimano to a 113mm truvativ, my chainline problems had been solved (using bulletproof cranks). however, it looks like the 113mm is truvativ is actually a 108mm truvativ (or a 107mm shimano) with 5mm more on the non-drive side. my chainline is exactly the same as with a 107mm shimano.
guess i'm off to get some spacers myself.