Shimano E-Thru thru axle with 12 x 148 mm for use with Boost rear hubsano E-ThruThe tool-free removable axle system optimises strength and load distribution and ensures trouble-free operation thanks to the reliable internal cam mechanism and the new fastening method. Type: Quick release thru-axle Additional Information: – Thru axle for Boost rear hubs Operating Range: MTB Diameter: 12 mm Weight Rear: 71 g Installation Width Rear: 148 mm