Rolling resistance
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Jacobzky
New member
funny how i came across this tread while i was browsing tirerack for tires and found a good read.
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=29
http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=29
Camprunner
New member
I know one way is to ck the weight of the tire if it's real heavy it takes more to move it.
Camprunner said:
I've heard that too but am not sure I believe it when you're talking about adding, say 40lbs of extra tire weight on a vehicle that weighs close to 4000 lbs. It's meaningless. Heavier tires will not add as much weight as having a passenger in the car, for example. and I never really notice a drop in as mileage when I have a passenger.
I put rolling resistance down to other basic laws of physics, mainly friction based on the compound used in the tire tread. Softer compound will give better grip but increase friction. The profile of the tire is also a factor IMO. Some tires have more rubber in contact with the ground than others depending on their stiffness and tread profile (which is why increasing pressure will give better mileage but worse grip by reducing ground contact slightly).
In addition, upsizing tires will completely alter the drag dynamic of the vehicle, which is why some people who upsized complain of worse mileage (even after factoring in different rotational speed).
trdcorolla
New member
The extra weight does make a difference, heavier tires add unsprung weight, which makes the vehicle work more to rotate it and makes the brakes work more to stop it.
