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Rev

4

Could you add a short summary of the results of the test from the linked video ?
– Puck
Commented Sep 1, 2020 at 7:04
1

Two corrections: Rolling resistance increases linearly with speed. Secondly: Good road tires have ~10W losses at 30km/h and 40kg load. To ride at 30km/h you’d usually need something like 150W total power, which would mean 13% losses from the tires. Not too far away from OP’s 20%. Cheaper road tires can easily have twice the resistance.
– Michael
Commented Sep 1, 2020 at 7:40
5

To be precise: Rolling resistance force is constant, rolling resistance power is linear. Likewise, drag force is quadratic, and drag power is cubic. So, either you say that rolling resistance is constant and drag is quadratic, or you say that rolling resistance is linear and drag is cubic. Just don't mix these statements.
– cmaster - reinstate monica
Commented Sep 1, 2020 at 8:31
Another correction: the answer assumes that you're riding alone. In a real road race you'll spend at least some time inside peloton or in paceline where air resistance is significantly less, which increases the proportion of rolling resistance.
– ojs
Commented Sep 2, 2020 at 9:38
Weight distribution across the two tyres is not equal. More weight is taken by the back tyre and therefore it accounts for most of the rolling resistance.
– Jeremy Boden
Commented Sep 9, 2020 at 20:54

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