"The tube is a pawn with the weight of a queen on its shoulders." - Zipp Speed Weaponry Cunsumer Catalog (Sreiously - it really says this!)
While it won’t make you faster, it can prevent you from being slower. To help you squeeze a little more peace of mind from your bike, we begin with a lightweight butyl tube to minimize weight and rolling resistance. We add a lightweight aluminum valve with a removable core to work with our valve extenders, making inflation easy and reducing weight, while keeping the wheel as well balanced as possible. The 37mm-long valve on this 96g tube fits the 101 for 19-25mm tires.
Additional Extension Valves sold seperately