Ask a Mechanic | SRAM/Shimano Crank Compatibility & Eliminating Upper Back Pain Ask a Mechanic | SRAM/Shimano Crank Compatibility & Eliminating Upper Back Pain Daniel2014-03-05T15:58:34-08:00 Welcome to our Ask a Mechanic column where our expert mechanic Daniel Slusser answers Ask a Mechanic | SRAM/Shimano Crank Compatibility & Eliminating Upper Back PainDaniel2014-03-05T15:58:34-08:00