frontrangegravel
Anybody ride any of the Colorado Endurance Series races?
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2slow2Bfast
I did the Dirty Double Fondo in Salida earlier this year. It was fantastic! A really hard, long day but the area is spectacular. 
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tinkermellow
The Dirty Double, Salida BFL, & Durango Dirty Century were outstanding.
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jfcooper
I've done SBFL, Ring the Peak 3 time (singlespeed), Anti-Epic, the R2G2 (also SS) now defunct but was a great route. It's a great series with something for everyone.
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