After reading a few threads here, I bought a 135mm Sinz ISIS crank from eBay for my son's 20" bike. It currently has ~156mm cranks on it which are way too long, and I'm hoping the 135mm's are short enough.
The current cranks have a ~47mm chainline. I need to buy a BB, but can't find anything on the net that indicates what length I need (searching mtbr, only three posts appear for "sinz isis", and only one of those has the BB they used).
It looks like 68x113mm is the most popularly available size, but I have seen 68x108mm as well as 115mm+.
I'd like to have a BB ready to go when the cranks arrive. Anyone suggest the right length? It has a 7spd'ish freewheel on it now, but I'll be replacing everything with the cast off parts from my bikes (XT/x.9'ish) so would like something that'll shift cleanly.
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