The Tioga PowerBlock OS-20 tireis a lightweight race tire with low-profile directional side lugs for excellent cornering on hard pack surfaces, smooth center tread for less rolling resistance, and a Cyclex 120tpi casing. This is a great tire for BMX racing.

Size: 20 x 1.85″ OS-20 (ISO 451mm)
Bead: Wire
Pressure Rating: 35-65psi
Posted Weight: 15.17oz; 430g
Color: Black

This tire only works on OS-20 (451mm) rims. If you are not sure what that means, this won’t work on your bike.