Tire Size 285 vs 305
#1
Tire Size 285 vs 305
I just found something interesting on Pepboys web site they have a formula to determine tire size and when you do the calculations of a 285/75/16 and the 305/70/16 both tires come out to be the same as far as how tall they are here is the formula on there site.
(Cross section width x 0.aspect ratio) x 2
__________________________________ + Wheel Diameter
25.4
=Overall Tire diameter in inches
EXAMPLE: 285 x 0.75 x 2
_____________ +16 inches =32.83
25.4
(Cross section width x 0.aspect ratio) x 2
__________________________________ + Wheel Diameter
25.4
=Overall Tire diameter in inches
EXAMPLE: 285 x 0.75 x 2
_____________ +16 inches =32.83
25.4
#2
#3
#4
#5
Richard, the 16" example is correct.
285/70R16 = 265/75R16
This one is wrong, or at least, that there is about an inch in diemter difference. If a 265/75R17 tire existed, it would be similar to 285/70R17.
285/70R16 = 265/75R16
(17' Tire Size Comparison)
285/70-17 is about 33x11.5-17
and
305/70-17 is about 33x12.5-17
285/70-17 is about 33x11.5-17
and
305/70-17 is about 33x12.5-17
#6
OK APT i now se what you are talking about he got the 285/70/17 part wrong thus creating the wrong eqaution Good enough. MY BAD and I stand corrected.The thing is I was not talking about 17" tires and haven't even looked at any of the sizes that are available but as far as 16" tires goes i think there may be a 265/75/16 available.I would have to look it up and check.And since i have not need for a 17" tire i do not pay attention to what is available for that size.
Richard D.
Richard D.
Last edited by Richard D; 02-20-2003 at 03:58 PM.