Reserve knows that modern trail bikes need to be able to tackle everything from rough and tumble trails to swerving singletrack, and that's why they made the 30 HD i9 1/1 27. 5in Boost Wheelset. It's a do-everything wheelset that inspires performance and speed for our ride. It's built to handle the needs of today's trail riders, and it features a design ready to stand up to abuse. A 30mm width is for use with 2. 5in tires, and a redesigned inner rim bed makes tubeless set up easy. Plus, an asymmetrical construction is stiffer and stronger for increased reliability.