Cassettes that fit the 2025 Specialized 2025 Allez Sport - Shimano Tiagra

We know this bike runs 10-speed, but not its chain family — and a cassette has to match those before anything else matters. We'd rather tell you that than guess: the wrong cassette won't mount on the hub, or won't shift once it does.

Our guide to identifying your freehub walks through reading the speed count, gearing and freehub body off the bike itself.