The Pint X has a 4.5" stock tire width. This is opposed to a 6.5" tire width on the XR and GT line. This is notably more narrow tire which may be a little more challenging to balance. If you are wobbling when riding, this has more to do with foot positioning. Inch your feet around the footpad until your body mass is completely centered over the wheel. Beginner tip: run lower tire PSI.