Early Rider's most rewarding bike was one of the hardest to develop. At a little over 5.5kgs the Belter sets the standard. It's worth bearing in mind that every kilo on a 3 year olds' bike is the equivalent of 4 or 5 on an adult bike. At 5kgs lighter than most 16" bikes, that's a big difference to a child.
It's not just the weight however, everything is designed low rolling resistance. The high thread count' high psi tyres, the cartridge bearing hubs and even bespoke full bearing aluminium pedals all play a part. But it is the Belt drive that steals the show, a belt will never stretch like a chain, it'll never be gunked up by dirt and grease and it will be as good the day your kid has finished with it as the day they first rode it and parents dont have to worry about maintaining it.