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Right, I'm trying to fit an old crank to my commuter.
I have an old square taper RPM crank with decent rings and BB.
The BB is stamped D-EL. Now I can't seem to find much info on this but think it might be a massive 127.5mm length.
I'm using a double chainset and from Sheldon's site that seems to imply a chain line of 43.5mm.
With the D-EL BB fitted, I get a chainline of 55mm.
So, am I correct in thinking I need a 105mm BB? And if so, where do I get one from (Wiggle and ChainReaction don't have them).
Or can I just get away with a 107mm?
No one?
The worst that a 107 would do if not ideal would be give you a larger Q and less ideal chainline. If it's cheap enough, I'd just take a punt...
Seems right. I would check the chainstay/chainring clearance first as that might sway things a bit. You can get 103mm track bbs too if 107 is too far out, but that might be too tight. It's 2mm either way, so given that you'll spend more time in the big ring, then 107 seems reasonable.
Thanks
check crank/chainstay clearance with the current BB and cranks. That might be more of a limiting factor than anything else.
1999 LX cranks worked fine with 112.5mm spindle BB on my commuter until they snapped (nothing to do with the BB!).
1991 Ritchey/Sugino cranks needed a 122.5mm spindle length to clear the chainstays.