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Last Updated: Monday November 29 2010 16:00 GMT

Seriously extreme bike race!

Seriously extreme bike race!

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Get ready for a seriously extreme bike race at the top of a volcano in the Indian Ocean...

Around 500 people charged down the slopes at almost 40 miles per hour.

As well as avoiding each other, they had to dodge volcanic rocks and trees.

Unsurprisingly, most of them finished off with a few bumps and bruises!