Lab tested: How does your pedalling technique change as you ride on cobbles, and how can that affect a pro rider's equipment choice?

Behind the scenes at the BodyRocket Pedalling Efficiency Test.

If ever you've ridden on cobbles, you probably know a few basic truths.

Firstly, it's quite unpleasant, bone-rattlingly so. They're often slippery, and with a ridge at the centre that relentlessly urges you into the ditch at either side. Your momentum is sapped with every stone, and picking a good line is akin to finding a quiet corner at Glastonbury Festival.