Shimano XT M8000 Quick ReleaseThe Shimano XT M8000 QR Skewer is based on the internal cam design created by Tullio Campagnolo many years ago. An internal cam is completely shielded from contamination, increasing the life of the skewer. It will also provide vastlymore clamping force, holding your wheel tighter than "lightweight" external cam skewers. Pair this cam design with a durable steel shaft, and you've got a reliable skewer for both mountain and cyclocross.FeaturesLengths: Front (for 100mm Over-Locknut Diameter Hub) -133mm / Rear (for135mm Over-Locknut Diameter Hub)-173mmClaimed weight: F-57g / R-64g | Shimano XT M8000 Quick Release Black, Rear Only