Airwheel X8

£560, weareair.com

Getting to grips with the single 16-inch wheel of the X8 takes considerable patience and commitment, plus a fair amount of time spent splayed on your arse. A built-in chip handles the X8’s upright balance, but sideways stability is firmly the responsibility of the rider. Get it nailed, though, and you’re in for a comfy, quirky ride. The X8’s 170Wh lithium-ion battery takes just 1.5 hours to charge and delivers up to 14 miles at 12mph. It’s not the prettiest, and it’s also one of the heaviest machines on test here, but if you’re after a toy with a twist, the X8 fits the bill.