Wheel Factory CB Synth Enduro Alloy 27.5" DT Swiss 370 15x110 ISWheel Factory hand built versatile wheels Crankbrothers Synthesis Enduro Alloy rims feature a tuned front and rear carbon rim system optimized for Enduro riding and racing Front wheel is 31. 5mm wide with 28 hole drilling and is tuned to be more compliant to improve comfort, handling, and front end grip Rear wheel is 29. 5mm wide with 32 hole drilling and is tuned to be stiffer to support higher impact forces, and improved tracking at high speeds DT