rolling resistance and friction coefficient?

[89HF]

Somebody posted a method for estimating the rolling resistance of a tire in another thread but it didn't seem very user friendly. Does anyone know if there is a connection between a tire's rolling resistance and its friction coefficient?

[CapriRacer]

Originally Posted by 89HF

Somebody posted a method for estimating the rolling resistance of a tire in another thread but it didn't seem very user friendly. Does anyone know if there is a connection between a tire's rolling resistance and its friction coefficient?

Yes, and I've talked about it in detail here:

Barry's Tire Tech

Short version: There is technology triangle between Rolling Resistance, Traction, and Treadwear. In order to improve one, you have to sacrifice one of the other (or both).

[89HF]

thanks, at first glance, it looks like I can learn a few things from that link. However, since the friction coefficient of a tire is fairly easy to determine (by doing a drag test for example) is there any way to take that number and translate it into rolling resistance?

[moonmonkey]

if you are looking at lrr tires, the rr is avialible on many tires,on the manufactures websites and other places.

[Old Tele man]

...from the number crunching I did, that "flat" spot (contact patch) area on the bottom of the tire roughly equates to a 3% reduction in the mathematical radius of the tire.

...I got ~97% values for the 16" diameter Goodyear, Firestone/Bridgestone and Michelin tires that I analyzed.

...how'd I do it? Just backsolved from their posted tire-revolutions-per-mile against their published static (unloaded) tire diameters.

[CapriRacer]

Originally Posted by 89HF

thanks, at first glance, it looks like I can learn a few things from that link. However, since the friction coefficient of a tire is fairly easy to determine (by doing a drag test for example) is there any way to take that number and translate it into rolling resistance?

No You have 3 variables and only one of them would be known.