Originally Posted by
terrymorse
For real?
I'm trying to think of the physics that explains why standing might increase rolling resistance.
Coming up blank.
the tire carcass and rubber are made to behave differently, eg, when you're rolling with wheel perpendicular (when low RR is desired) or when leaned over (when grip, and thus resistance, is desired). When you're rocking out of the saddle, how is your wheel behaving? add this to the hysteresis of low psi, you get a lot of RR. RR laboratory tests are done in pretty ideal and static conditions to achieve lowest RR, ie, they use constant force, constant surface property, with wheel perpendicular to the drum. People don't ride in this static manner in real world.