Did you see any of the Giro last year? They had a mountain time trial at a place called Plan de Corones, the final 5 kms of which were on a dirt road. Have a look at the pictures below to see that everyone was riding standard racing tyres.
http://cyclingnews.com/photos/2008/giro08/index.php?id=/photos/2008/giro08/giro0816/gallery-giro0816
@andyp started
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Did you see any of the Giro last year? They had a mountain time trial at a place called Plan de Corones, the final 5 kms of which were on a dirt road. Have a look at the pictures below to see that everyone was riding standard racing tyres.
http://cyclingnews.com/photos/2008/giro08/index.php?id=/photos/2008/giro08/giro0816/gallery-giro0816