Our race is in Southeastern Wyominig (Dead Dog Classic - two hours from Denver. We are an ACA race and therefore no Cat 5's (you can ride with one day licenses if not an ACA racer). Here is what we had last year for RR:
SM Pro 1,2 - 46
SM 3 - 72
SM 4 - 71
SM 35+ - 25
SM 35+, 4 - 44
SM 45 + - 46
SM 55+ - 21
SW 1-2 - 16
SW 3 - 14
SW 35+ - 13
SW 4 - 13
Crit numbers were about the same.
High altitude racing (all above 7200 ft) with quite a bit of climbing on the RR.
www.deaddogclassic.com