If you want to improve as a cyclist in all facets of the sport, then Cyclocross the best way to achieve results. Cyclocross racing makes you a better rider. If you race bicycles, yet you do not race Cyclocross, you are going backward right there!
CCCX Race info can be found here... www.cccx.org
Remaining Nor-Cal Cross races can be found here....
http://www.ncnca.org/cyclocross/2008/calendar.html
Cyclocross images from 2008-09..........
