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Tire Tech Basics  

How to read a tire sidewall
Example shown is 255/35ZR20 93W
255 Section Width (mm)
35 Section Height (Aspect Ratio)
Z Speed rating
R Radial
20 Wheel Diameter (inches)
93W Service Description
Calculating Tire Dimensions
Example: Size 275/55R20
1. 275 (mm) / 25.4 = 10.8 inches
2. 10.8 x .55 = 5.94
3. (5.94 x 2) + 20 = 31.88 inches
Section Width x 25.4 = SWi (converts mm to inches)
SWi x Aspect Ratio = Section Height (SH)
(SH x 2) + Rim Diamewter Outside Diameter


Speed Symbols and Tire Descriptions 

click for printable table
Load Index and Equivalent Loads

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