The Zipp 30 Clincher Rear Wheel is an aluminum wheel that is faster than it looks. Zipp is well known for the fastest wheels around. Now you can get your hands on a aluminum aero wheel that feel like carbon. Speed and Durability are the key to the Zipp 30 Clinchers. The new tougher hub is Shimano 10 or 11 speed compatible. Meaning you can keep this wheel for years to come. The Zipp 30 Clincher is a fast, light weight, and durable way to leave your competitors behind you. Which is where they belong.