the 29+ish bike is built. 45mm rim with a 29x3 tyre on the front and on the back a 35mm rim and 2.4 tyre. the back of the frame doesn't have enough clearance for anything bigger but compared to the 22mm rim it replaced it's a lot less squirmy and when riding down steps the rear rim doesn't bang on each lip of the step. Traction is a bit of a mute point at the moment as it's so dry. The ride is much more comfortable though. Now for more testing!