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@gbj_tester
If you're doing about 26:00 now with 32 spoke wheels, a rear disc on its own will save 6s to 13s over 10 miles depending on how bad your current wheel is. A front disc is worth about double the time saving, but not CTT legal. A Zipp 808FC, though, is almost as good as a disc. Taken together, you're looking at about 40s for a slow rider by going from classic road wheels to the best TT wheel set. Time savings for fast people will be considerably less.