Stay Strong REACTIV 2 Disc Wheelset. Premium Gloss Carbon race rim with gloss water decals and a smooth finish. The rear rim is laced to a sealed alloy 10mm REACTIV 2 hub with a 17T cassette, 6 pawls and 180 points of engagement. The front is laced to a sealed alloy 20mm thru axle REACTIV 2 hub. Brake disc kit and adaptor sold seperately.