To achieve such innovation in children's bikes we totally re-invented the category. From dynamics to balance speed, weight savings to safety, manoeuvrability to efficiency; all our bikes are a revolution in design. The bikes fit the rider better in all the right places for all the right reasons. ByK Bikes grow with the rider - the longer wheelbase and custom-design v-bars ensure that not only the rider fits the bike better from the start, they have more room for growing legs and arms. Find out more about the unique, ergonomic design of the ByK Bikes. When looking for the right model for your child, you'll naturally begin by looking at models categorised by age and height. However, unlike many other brands, the age and height range overlaps dramatically for each of the ByK ranges. As most kids' balance develops at roughly the same speed, using age and height with ability and confidence is far more relevant. As parents, you know all too well the height differences of your kids' friends and peers. And height has absolutely no indicator of ability or confidence. Read more for an in-depth kids bike sizing guide.