Rocket mountain bike beats speed record
20 May 2013 Last updated at 22:51 BST
The record for the top speed reached on a mountain bike was broken on Sunday.
Frenchman François Gissy reached a speed of 263km/h (163 mph).
The mountain bike powered by hydrogen peroxide broke the previous record of 242.6km/h (150 mph) on a track near Mulhouse, eastern France.