Carpenter's greatest dominance has been on Pikes Peak. He has won sixteen races; six ascents and ten marathons, including an unprecedented double, winning both on consecutive days in 2001. On the ascent he holds the age group record for both 40- to 44-year-olds, and 25- to 29-year-olds, the latter the outright record with a time of 2:01:06, set during the 1993 marathon. In the marathon itself, he holds the record for the 20- to 24-, 25- to 29-, 35- to 39- and 40- to 44-year-old age groups, as well as the outright fastest time of 3:16:39, also in 1993.