Blackbird x Ibis Send 29" F/R Wheelset 15x110/12x148 Boost MSIbis pioneered wide rims for better tire sidewall support so you can run lower air pressure for improved traction and braking control 6061 asymmetric, tubeless ready aluminum rims with 35mm ID, 44mm OD Stans BST adapted shallow 17mm rim cross section for greater compliance Hollow box section beadwall eliminates pinch flats Rear wheel features Send 2 rim with internal ribs for added strength Ibis Logo hubs with International Standard 6 bolt disc rotor