Blackbird x Ibis Send 29"/27.5" F/R Whlset 15x110/12x148 Boost XDinchMullet inch wheelset with 29 inch front and 27. 5 inch rear Ibis 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