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@gbj_tester
Is it super fast in your experience, or are you just basing that on other people's reports? I don't seem to be able to go any faster on the A303 than I can on the A4 at Woolhampton, for example. This on fixed, which suits the flat A4 better. That P613 has a gift hill at the start where you'll be spinning out on whatever gear you need to grind up the hill just before the finish.