Product Name:S21-3.0 mountain bike wheel set
Material:aluminum alloy hub+45 # straight copper head+ultra-light double-layer rivet aluminum rim

Hole:24 holes
Hub: front 2 rear 4 bearing, straight pull quick release
Open Gear:front wheel 9*100mm, rear wheel 9*135mm
Speed:7/8/9/10/11/12 speed cassette
Weight: about 1750G (front and rear wheel weight does not include quick- release/tire pad)
Complimentary:Quick-release, tire pad, repair 2 spokes