narrower wheels and tires?

[CapriRacer]

Originally Posted by MARTINSR

..........Now, honestly, with that little contact area, I would think these tires at the recommended air pressure would be pretty darn low LRR! What do you experienced guys think?

Brian

Google is your friend!

Bias tires have worse RR. I can't imagine that you can make up for the deficit just by the difference in tire sizing!

[MARTINSR]

But again, it is simply something I don't understand, not that I am challenging it. I will learn more about it when the time comes, my brain is overwhelmed with other stuff right now. But just at face value, a 20 sq in foot print of the little 5.90 bias plys seem to be less a rolling resistance than the 40 sq in of a radial of similar size. It doesn't seem to me that the advanced design of the tire could overcome that foot print.

Brian

[CapriRacer]

Originally Posted by MARTINSR

....... But just at face value, a 20 sq in foot print of the little 5.90 bias plys seem to be less a rolling resistance than the 40 sq in of a radial of similar size.......

And that is where you need to start to understand this. ie. Are the footprints different sizes and if so, by how much? Does a factor of 2 seem right for the same size?

[Patrick]

Originally Posted by MARTINSR

But again, it is simply something I don't understand, not that I am challenging it. I will learn more about it when the time comes, my brain is overwhelmed with other stuff right now. But just at face value, a 20 sq in foot print of the little 5.90 bias plys seem to be less a rolling resistance than the 40 sq in of a radial of similar size. It doesn't seem to me that the advanced design of the tire could overcome that foot print.

Brian

Brian, when you get a chance read through this - it explains it pretty well: http://media.wiley.com/product_data/...0471354619.pdf

[heat77]

175-65-14 or something wouldn't be just fine. Only if you need new tires. Cost of changing tires just for mpg purposes is ridiculous, you never save enough gas to pay for the tires.