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There are variables to consider. First turbo fins are a must to maximize efficiency and slow your cadence. I found the GT to be noticeably smoother with less resistance. This is only if they are maintained with proper chain lube and seasonal rebuild to clean and re-apply fresh grease. Keeping chains from getting too slack is very important The MD are a stiffer fin so, smaller surface area, a little more resistance with less flex getting up to speed but right there along the GT once up and moving.
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