Hey twobob. Last year the I watched an episode of Top Gear where one of the presenters drove to the top of Eyjafjallajokull; unfortunately the volcano in question promptly erupted afterwards so not sure if its ok to ride.
In terms of suitable volcanoes; you would need one formed by lava. This is where an eruption occurs in a crack on the Earth's surface causing hot magma to leak. Over time the magma cools to form a soft slope that forms the volcano. With a set of hard rubber compound tyres designed for gravel/sand you should be able to get close to the summit of one, although you would have to make a cooling system for each tyre as the heat would cause them to melt.
To find an active one may be tricky though, as most are found on the seabed. I have heard of a place in Eritrea called the 'Devil's Pit' that might be interesting to ride to; it is essential a large hole in the ground with magma spewing out of the bottom.
Good luck!
Last edited by tommysmithfromleeds; 17 Apr 2011 at 11:57.
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