When I raced crits it was on a steel bike with Ultegra. It wasn't the lightest, but it severed me well and could be fixed. In my area Cat 5 was like bumper cars, 30 would start and 10 would finish. This is was turned me off to crit racing. Now that I am much older and race with the "old" guys it is much more fun, and I don't mind using my good bike.