Understanding Tire Size
#1
01-28-2009, 07:31 AM
Join Date: Jan 2009
Location: Thousand Oaks, CA
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Understanding Tire Size
Sorry to sound like a rookie here, but does the 2nd number ina tire size mean the higher the number the more "thicker" the wall profile?
Like a 275/35/20 compared to a 275/40/20?
Any info would be greatly appreciated to educate me. Thanks!
Like a 275/35/20 compared to a 275/40/20?
Any info would be greatly appreciated to educate me. Thanks!
#2
01-28-2009, 07:37 AM
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Join Date: Nov 2004
Location: Delawhere?
Age: 44
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The second number is the height of a single sidewall compared to the tread width.
So,
275mm across the tread
The sidewall is 35% of 275mm
The wheel is 20 inches
You need to count the sidewall twice for overall height.
or
(2(275 x .35))/25.4+20
The 25.4 is to convert mm to inches. A 275/35/20 is 27.58 inches high. A 275/40/20 is 28.66 inches high.
So,
275mm across the tread
The sidewall is 35% of 275mm
The wheel is 20 inches
You need to count the sidewall twice for overall height.
or
(2(275 x .35))/25.4+20
The 25.4 is to convert mm to inches. A 275/35/20 is 27.58 inches high. A 275/40/20 is 28.66 inches high.
Last edited by Gramicci101; 01-28-2009 at 07:43 AM.
#4
01-28-2009, 02:16 PM
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