1. The clamping jaw (11) has a clamping surface (13) whose radial distance continually increases in relation to the rotational axis (15) in at least one angle area.

2. Box One M35 Oversized Crankset "There is nothing quite like the BOX set up in Bmx racing.When racing I rely on products like my Box cranks with 30mm spindle to help with direct power transfer to the back wheel or my Box front end set up with X5 forks and bars equipped with a 31.8mm clamping surface to guarantee my front end is as solid as possible!"

3. Box One M35 Oversized Crankset "There is nothing quite like the Box set up in bmx racing.When racing I rely on products like my Box cranks with 30mm spindle to help with direct power transfer to the back wheel or my Box front end set up with X5 forks and bars equipped with a 31.8mm clamping surface to guarantee my front end is as solid as possible!"