Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - driving on 4 narrow spare tires (or similar) to reduce rolling resistance

drmiller100 · 12-26-2011, 01:02 PM

there are actually 3 numbers on tires.

the 195/85/15 for instance. The middle number is the ratio of height to width.

if you want a narrow tire, you want the middle number to be high. 85 is about as narrow as it gets.

12-26-2011, 01:02 PM	#2 (permalink)
drmiller100 Master EcoModder Join Date: Dec 2011 Location: Boise Idaho Posts: 842 Thanks: 39 Thanked 89 Times in 69 Posts	there are actually 3 numbers on tires. the 195/85/15 for instance. The middle number is the ratio of height to width. if you want a narrow tire, you want the middle number to be high. 85 is about as narrow as it gets.