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Old 04-02-05, 10:20 PM
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Machka 
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I have done quite a number of centuries on my mountain bike, and also my first 200K brevet.

The mountain bike centuries do take longer, but not necessarily by very much. It depends a lot on weather conditions.

My mountain bike centuries are done in the winter, often in sub-freezing temperatures. They run about 9 - 10 hours depending on how cold it is, or if there is snow or freezing rain, etc. My road bicycle centuries, usually done in the summer when the weather is much better, and I'm in better shape, range between 6 and 8 hours.

However, I can tell you about my 200K brevets:
2001 - 12 hours - done on my mtn bike
2002 - 13 hours - done on my road bicycle
2003 - 10 hours - done on my road bicycle
2004 - 10 hours - done on my road bicycle

2001, 2003, and 2004 all had pretty good weather; 2002 included over 100K of an incredibly heavy headwind. So I guess, given similar conditions, over 200 kms, the mtn bike takes me a couple hours longer, than a road bicycle (about 3 km/h difference).
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