TR412 Snap-In Rubber Valve Stem - 4pcs - Tubeless Tire Rim Scooter Moped 4 x Snap-In TR412 Rubber Valve Stems It will fit on most rims with an 11.5mm (.453") valve stem hole. The Valve has a 15 mm diameter were it mounts on the rim, not at the bottom. 65 psi maximum cold inflation pressure. Retention Type: Snap-In, Effective Lenght: 22mm