|
I just had another thought, about dimensions you might want to verify: The inner chainrings on a road double often come very close to overlapping the BB shell. With standard road BCDs (110mm, 130mm), there's plenty of space for the chainring to overlap the BB shell and external bearing cups. But with a 80mm BCD chainring, how space is there with the outer diameter of a T47 BB shell and bearing cup? With a 64mm BCD chainring, it might very well be a no-go (I've only tried a 64mm BCD chainring with a standard 68x1.370 ISO BB shell).
What's the actual outer diameter of a T47 BB shell, and what's the offset of the outer face of the BB cup?
|