It's been around for years, but the Brompton still shows the rest how a folding bike should work. We spent considerably less than a minute transferring the M2LX from the boot to the road. And, of the models tested here, it took up the least space in the car. There’s also a rack for bags and dynamo-powered lights. Although there are only two gears, in practice we found the ride pretty easy, even going up moderate hills. It’s pricey, but this is the best.