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Originally Posted by capriracer
When tires are measured for RR, one of the test conditions is the load - which would be larger for larger tires. But when a tire is applied to a vehicle, the load on the tire would be the same, regardless of what tire size is used. So the RRF (Rolling Resistance Force) needs to be divided by the test load to get RRC (Rolling Resistance Coefficient) - which is shown below.
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Bigger tyre = lower RR.
Car or bike, doesn't matter.
The whole reason rubber tyres have a high RR in the first place is deflection (hysteresis losses). A bigger tyre deflects less for a given pressure/ load, which means lower hysteresis and lower RR.
Imagine putting a car tyre on your bike. You'd have virtually zero deflection, virtually zero hysterisis and extremely low RR. Doesn't mean you'd have a bike that's fast or easy to pedal though.