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@gbj_tester
I don't really know how much speed I bought, but it must be some. I had to get a second set of wheels so I could run different tyres for training vs. racing anyway. It's not an all time PB, but it's a 35 second improvement on my best since restarting after a 7 year break, and last year's 59:48 was on the supposedly faster H25/2, but with Mavic Ellipse wheels, etc. etc. It's uncontrolled variables right left and centre. If I go to the wind tunnel next year, I'll take both sets of wheels and measure the difference if there's time, but that isn't a primary goal since I think it's safe to assume that the carbon ones are faster.