Description:Tubeless valves by Speed Evolution. We've been on the lookout for valves like this for a long time, and finally talked Speed Evolution into making some to our specs. Black and the perfect length for our rims. Because our rim profiles are deeper than most, we recommend the 46mm versions with mountain rims to give you some extra room to get a pump head on there. These are the best valves made, full alloy construction with a vulcanized rubber base that doesn't clog with sealant or collapse as you tighten the nut. A rubber o-ring keeps the nut from coming loose. Most importantly, they just look cool!