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are most spindles generally interchangeable?
The relevant characteristic is size and number of balls, as this defines the race geometry. If this is the same between BB assemblies, they are essentially interchangeable as long as you have enough axial adjustability to take up any differences in that direction.
gbj_tester
Would the bearings needed for a 70 square taper spindle be the same for a 68? and are most spindles generally interchangeable?
Got a bike which is italian threaded but bb shell is 68mm wide (bsc size)