The sm ax58 axle for e thru i type rear hubs from shimano is a highly reliable and rigid replacement axle for e thru i type shimano hubs it uses the i type design and 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 and removal of the wheel available in 12x148mm or 12x142mm frame dropouts