I agree with daftvader, my first son was desperate to get on a bike like me and was racing about on his balance bike shortly after his 2nd birthday and on a 16″ Hotrock without stabilisers the week after his 3rd birthday. Second son wasn’t as interested so instead of pushing him to ride I just left him to his own devices, one day he just decided he wanted to have a go on it and that was that. Was the same when he moved to a big bike, as he was such a big lad the balance bike was too small for him pretty soon so he ended up on the hotrock with stabilisers. Didn’t want to go near it without them for months until one day he asked me to take them off then he was riding in half an hour, can’t get him off it now!