Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Higher tire pressure -> lower MPG??

CapriRacer · 10-07-2015, 02:13 PM

Slippage?

I think there are 2 different concepts being discussed.

1) Slippage in the direction of travel. As tires are required to generate more forward force to overcome wind resistance, the tire has to slip relative to the direction of travel to generate that force. This MIGHT have implications on RR - BUT - when RR is measured in a lab, there is no wind resistance. The only thing being measured is pure RR. That's why I think the standing wave is the reason for the increased RR.

2) Lateral slippage - as in a turn. Another way to look at this is grip. And, yes, slippage due to loss of grip is going to affect the energy loss a vehicle experiences, but I don't think that is impacting what that graph is showing.

10-07-2015, 02:13 PM	#37 (permalink)
CapriRacer Tire Geek Join Date: May 2008 Location: Let's just say I'm in the US Posts: 796 Thanks: 4 Thanked 393 Times in 240 Posts	Slippage? I think there are 2 different concepts being discussed. 1) Slippage in the direction of travel. As tires are required to generate more forward force to overcome wind resistance, the tire has to slip relative to the direction of travel to generate that force. This MIGHT have implications on RR - BUT - when RR is measured in a lab, there is no wind resistance. The only thing being measured is pure RR. That's why I think the standing wave is the reason for the increased RR. 2) Lateral slippage - as in a turn. Another way to look at this is grip. And, yes, slippage due to loss of grip is going to affect the energy loss a vehicle experiences, but I don't think that is impacting what that graph is showing. __________________ CapriRacer Visit my website: www.BarrysTireTech.com New Content every month!