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In contrast to my statement about tires above, one of the German bike magazine did a test a while back where they pimped a Rocky Mountain Instinct Carbon 70, and checked both segment and lap times and power.
Interestingly enough, the heavier, slower rolling stock tires (DHR I think), actually used _less_ power on the climb than the lighter, faster rolling ones they put on.
They suspect this was due to the fact that this climb was very steep and loose, and thus they experienced less wheel slip and could pedal more easily on the grippier tires.
The downhill gave the same times on each set up, but they suspect that if it had been wet, the stock set up would have pulled ahead.
The time and power savings came in the nearly level gravel road section of the lap along the ridge top. A chunk of the savings there can be ascribed to the lower rolling resistance of the swapped tires.
Stock bike (13.37kg):
Uphill segment 5:24s/188W, flat segment 3:03s/210W.
With faster rolling, lighter tires (12.99kg):
Uphill 5:32s/207W, level 3:00s/182W
With those light, fast tires and large further weight savings (11.08kg)
Uphill 5:20s/200W, level 2:55s/173W
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