Why 120mm and not 125mm? When we started looking at creating a large wheel, it made sense to us to follow the evolution of the scooter wheel, 100mm, 110mm and to 120mm. We had our team test them alongside the 125mm and they all said not only does it look more “flush” on a scooter, the speed and performance was amazing. On top of all that, we felt it was time that scooters stepped away from the Roller Blade sizes and didn’t go the easy path of using an already open road skate mold. 120mm may not fit all scooters on the market, however we are changing over all products to do so, starting with the 2015 Colt, Prodigy and KOS completes.