Bike Shop Girl
Join Date: Oct 2002
Location: Mooresville, NC
Bikes: Lots, road - mtb - cyclocross- commuting
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That sounds a bit over the top with buying a whole new bike. He is correct that it isn't compatible. And the reason the front works is it is a Shimano made... so they were made under the same specs. The rear doesn't work because it's made by a different company, that doesn't run under Shimano specs. The shop may have not ever tried running SRAM-Shimano.. or maybe it worked before on another bike with Shimano, but not the exact combo. For example, I can get some low end gripshifts to work with shimano deraileurs but not high end gripshifts.
PS. If he gets back on the 22nd just ride the race, it will be fun and a learning experience. It's only 5 days away, and even if you order a whole new bike you would be with out for part of that time. Also as I stated before I think that maybe over kill.