[Antipode]

What do you mean by efficient?

[Someone]

https://www.schwalbetires.com/tech_info/rolling_resistance:

“Tires with a smaller diameter have a higher rolling resistance with the same inflation pressure, because tire deformation is proportionally greater. The tire is flattened more and is “less round”.”

[necovek]

This only means that smaller diameter tires need higher inflation pressure for the equivalent rolling resistance (or rather, deformation). That only becomes a problem when you approach the limits of the material (eg. you can't inflate it any more).

[seb1204]

Thanks to the German company wehave this explanation. Ein hoch auf uns!

[fsckboy]

i don't know what he meant by it, but large wheels are better "flywheels" and that storage of momentum might make sustained pedaling easier.