They come up a fraction smaller than the rubber Q’s 2.2 in width and depth, I changed from rubber Q’s to the 2.4 X-kings for rear clearance on a new frame. Excellent tyres, very quick and grippy, but not quite as grippy as the RQ’s in flat out cornering. Get the protection type for stronger side walls, I got the tubeless ready version and I have to run them with a fairly high psi to stop them wanting to roll of rims when cornering!