This video redefines what can be done on a road bike.

Trials rider Martyn Ashton swaps his mountain bike for a £10,000 Pinarello Dogma 2 - a replica of the machine used by Mark Cavendish at the Tour de France - and takes it for a spin around the UK.

"I'm going to take you a new route I've made for my road bike," says Ashton. "It's certainly not conventional - but it should be a lot of fun."

Fun, terrifying and astonishing in equal measure. Just watch it.

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