Specialized Crux gravel bike with 50c Tracer TLR rear and 2.1 Thunder Burt front tires mounted, showing real-world tire clearance test

Gravel Bike Tire Clearance: What the Specs Don't Tell You

If you’re shopping for your first gravel bike and trying to make sense of tire clearance specs, here’s the first thing to understand: the number on the spec sheet isn’t the full story. I recently tested this on the Specialized Crux. The stated max clearance is 47mm — but I mounted a 50c tire in the rear and a 2.1" up front to see what the frame could actually handle. Watch the full video here. ...

April 11, 2026 · 6 min