Originally Posted by
alpineboard
The distance length of the circumference does not change when loaded, it stays the same, as when unloaded.
When going from an unloaded state to a loaded state, the radius changes at this contact point area, but the vital idea
to keep in mind is that one complete revolution equals one circumference distance length of forward travel distance.
Opinions welcome please thank you.
Originally Posted by
FL_Gator
I think the proposed explanation is that the deformation of the tire under weight is consistent for the entire revolution, thus the reduced radius is consistent for the entire revolution and therefore the effective circumference loaded is less than an unloaded circumference.
Visualized, imagine cinching a belt around the circumference and tightening it to reduce the circumference uniformly around the wheel, can you do that? Yes, because the tire deforms outward. This is what is happening at the contact patch all the way around the revolution.
Pretty sure FL Gator and Choddo are right. ( and Sheldon Brown agreed with them).
there’s a simple way to confirm this. Just do a rollout with different weights on the bike.
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