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windowExample: 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 |