I plan on being at the challenge RR early September. Current choices for me are: 35 1/2/3s, E3's for 2 laps/66 miles, and 45+ at 1 lap/33 miles.
My preference is 45+ at 2 laps/66 miles. To see what level of support exists for this option, how about a unscientific poll.
1) Are you planning on doing the Challenge RR
2) Do you prefer 1 lap (33 miles) or 2 laps (66 miles)