Gravel Cycling

Schwalbe Thunder Burt 2.25″ and G-One Speed Pro 2.35″ width on 32mm internal rims

January 31, 2026

Some reference info as I couldn't find many data points. Widths as measured on 32mm internal width hooked rims. Tires are brand new and unstretched.

Schwalbe G-One Speed Pro 29×2.35" / 60-622: 60.8 mm

Schwalbe Thunder Burt Super Ground 29×2.25" / 57-622: 55.8 mm

I knew Schwalbes measured small but even on these super wide rims they're less than advertised. Maybe they'll stretch a bunch.

by harblhat

PBJslaya on January 31, 2026 5:51 pm

For gods sake what “gravel” bike do you have those monsters on?
Bullonabike on January 31, 2026 6:13 pm

I’ve seen dirt bikes with less tire
Spara-Extreme on January 31, 2026 6:29 pm

I literally bought a custom frame for those One Speed’s. When I had them on my enve, they were great, but no clearance at all. True CHONKY BOIS
OUEngineer17 on January 31, 2026 6:30 pm

I also just measured these same tires on 32mm IW. For me, the 2.25 TB was about 54.5mm and the G-One Speed Pro was about 59.5mm. Since 2.35 is 59.7mm, that is spot on, but it is interesting the 2.25 is undersized from 57mm. It should help it fit frames with less clearance tho.