Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Largest Tire Diameter on a 6th Gen Civic (for lower RPM)

UnCivic · 11-09-2009, 10:44 AM

For any Civic DX of that generation stock size should be 185/16/15

175/65 R14 OD=23 inches = -2% from stock
185/65 R14 OD=23.5 inches = 0%
195/60 R15 OD=24.2 inches = +4%

175's were under sized, so your odometer would have read more miles than you actually traveled. For example, 100 miles would really have been 98 miles. Also, your 4th gear (automatic) cruising rpm's would have been higher (probably around 3300 at 65mph). Conversely, with the 195's, 100 miles is really 104 miles, and 4th gear cruising rpms are lower (probably around 2900 at 65mph for the automatic).

11-09-2009, 10:44 AM	#30 (permalink)
UnCivic EcoModding Lurker Join Date: Sep 2008 Location: Pittsburgh, PA Posts: 17 Thanks: 0 Thanked 2 Times in 2 Posts	For any Civic DX of that generation stock size should be 185/16/15 175/65 R14 OD=23 inches = -2% from stock 185/65 R14 OD=23.5 inches = 0% 195/60 R15 OD=24.2 inches = +4% 175's were under sized, so your odometer would have read more miles than you actually traveled. For example, 100 miles would really have been 98 miles. Also, your 4th gear (automatic) cruising rpm's would have been higher (probably around 3300 at 65mph). Conversely, with the 195's, 100 miles is really 104 miles, and 4th gear cruising rpms are lower (probably around 2900 at 65mph for the automatic).