With 20" wheels and a 'shorty' geometry, the MXR 20 bridges the gap between 18" and 20" wheel sizes - meaning you can get him onto bigger wheels earlier and keep him there longer. With a brand new, low-standover, light alloy frame and alloy rims, he'll spin up to speed with ease, but rest assured that when it's time to pull up fast, the combined backpedal rear brake and powerful front hand brake will do the job.