38mm vs 45mm Gravel Wheels: Which 10PLUS Depth Makes Sense?

The simple answer

For mixed gravel, technical sections and changing surfaces, choose 38mm. For faster gravel and routes with lots of hardpack or tarmac, 45mm is the more aggressive option.

10PLUS offers both depths in the Gravel T Series and Gravel E Series, so the real decision is how you ride, not which product line you're forced into.

Why gravel changes the equation

At lower average speeds, aero gains matter less than they do on the road. Tyre volume, pressure, stability and how the wheel copes with impacts all matter more.

That's why the 10PLUS gravel rims are wider inside than the Road T Series. The 38mm version is 25mm internal; the 45mm version is 24mm internal.

38mm: our default

Choose 38mm if your rides regularly include loose surfaces, climbing and technical corners. The shallower rim keeps the wheel sensible and lets the tyre do the work.

For an all-purpose gravel bike, the Gravel T Series 38mm is our value pick — the easiest recommendation if you want carbon wheels without turning the bike into a race-only build.

45mm: when speed matters

Choose 45mm when your gravel routes are fast and open, with long stretches of hardpack or tarmac. The deeper rim gives you a bit more aero benefit without becoming a road-style 60mm wheel.

The Gravel E Series 45mm adds the premium bearing and ratchet package. We'd only pay for it if lower weight and faster engagement are real priorities, not just because “E” sounds better.

Bottom line

Can't decide? Buy 38mm — it's the safer all-round gravel choice. Move to 45mm once you know your routes reward it.