they can space it however they want....... I took the "do not disassemble" cap off a Sram S900 BBright crank to see what was going on. It's a 122 spindle...
Wanted to revive this thread...
so if an aftermarket spindle (122) was made for the sisl crank, it would or would not work with BBRight??? if not, then why, what is the problem in making it work?
The Rotor 3D+ (plus) cranks work with BB30 and BBRight. do they use a different spindle or the same spindle is used for both? how do they make it work for both platforms?
if anyone can explain and elaborate, it would be appreciated,
thanks in advance.
The Sisl crank is meant to work with a certain length (short) spindle, this spindle is pretty much centered in a BB30 frame, and it ensures that you feet arecenter and the chainline is proper.
If you use a longer 122mm spindle either the non drive foot will be pushed out and you wont be centered, or the driveside foot will be pushed outward and you wont be centered and the chainrings will be pushed to far out for opimal shifting.
The other issue is that the bearings are meant to contact the SiSL spindle in specific places. I'm not sure that happens with a longer spindle. You could get a custom spindle made but it would be a pain and you would still have to compromise on spacing.