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Thanks for the answer, but the question was probably not clear enough so I allowed myself to clarify it: it was not that I was looking for a confirmation (in that case, I have both Michelin's, wear is the main reason to keep stuff separate), but rather if there information in BRR's dataset that would allow to nuance that CRR number when comparing tires with different tread patterns, purely based on BRR's number, I can find very knobby MTB tires that perform even better than reputed gravel semi-slicks, and it's somehow inconsistent to me.
– Rеnаud
Commented May 6 at 19:27
@renaud - Is the goal still to have just one set of wheels/tires and ignore grip reduction?
– David D
Commented May 6 at 20:13
The goal of the question is more to understand what seems at first a discrepancy between a real life perception and a lab result. I have the impression that the presence of knobs in real life is a source of drag, while BRR's data doesn't always show that (especially on a hard surface, such as a steel plate). It's just hard for me to trust a source when results seem inconsistent with experience. But maybe there's nothing in BRR's dataset that can help to understand this kind of differences, or that a 10W difference is not that significant in non-competitive situations.
– Rеnаud
Commented May 6 at 20:54
@Renaud This wouldn't be the first time when real life perception doesn't match with reality. But you if you want to switch to different tires on road, you can do it without any lab results. Just say that you don't like the knob buzz or don't want to wear out the off road tires.
– ojs
Commented May 7 at 15:35
2

@Renaud I think your understanding of what seems like a discrepancy is related to your idea of what causes resistance losses: it's not because of deformation of the tire. Unless you run steel tires, there's going to be deformation: what matters is whether the energy used to deform the tire is returned or if it's lost. Knobs per se don't cause loss unless they're so deep and separated that they compress and deform beyond their ability to return energy.
– R. Chung
Commented May 7 at 17:59

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