It’s brilliant fun. My six year old boy has just started racing at Bristol, and he’s totally hooked. He won a race on wednesday night and wouldn’t shut up about it for days! Really friendly scene, the older kids help the little ones, lots of dads and mums race. The 9 year olds can be pretty good – don’t know if your kids may find it a bit demoralising, although my boy doesn’t seem to mind the fact that some of the kids he’s racing against are four!
I ‘train’ with him at the bristol and bath tracks but don’t race (yet) as he still needs help with gates. I bought a pro xl 20″ but wish I’d bought a cruiser as they’re easier to ride and a bit more forgiving. You’d need a pro xxl or bigger at your height. Everything happens very fast on 20″ wheels. Great pumping, jumping and manual practise – once you’ve been a few times your mountain bike will feel like an unstoppable tank. We go mountain biking together too which is great fun, but bmx is more fun to do with the kids as you can ride at your own level, you never get stuck miles from the car, and there are loads of other kids and families there too.
I’d recommend keeping your wheels on the ground for the first few laps 🙂