In reply to iusedtoclimb:
For the last 32 years, the "Hell of the North Cotswolds (HONC)" has always been run each year on the same day as Paris Roubaix.
It traditionally was done on knobbly tyred tourers or cyclocross bikes, but only about a dozen or so of us persevered when most switched to using mtbs instead. But cyclocross bikes were better for it and the numbers might have risen again recently as that sort of bike has regained popularity.