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?
EAI Bare Knuckle, 1980's Ross Signature 292s 12 speed
Originally Posted by dmg
You didn't, like, put the BB in backwards, did you? They're asymmetrical - the drive side is longer.
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?
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
Road [racing] is one of the only sports where adult men can compete in a non-scholastic setting, so inevitably 8/10 racers are fiercely-competitive nobodies. It's fun as hell, but it's also the foremost refuge of defeated and aging jocks, turned middle-management types.
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.