The SM-AX58 Axle For E-Thru I-Type Rear Hubs from Shimano is a highly reliable & rigid replacement axle for E-Thru I-type Shimano hubs. It uses the I-Type design & has an integrated adjuster nut for the left hand lever housing as well as a hollow axle design. The simple quick release opening mechanism has been designed to be integrated with the frame for easy installation & removal of the wheel. Available in 12x 148mm or 12x 142mm frame dropouts.