Hello, is the formula for tire diameter 185 x % x 2divided by 25.4 + 14 let say 185.80.14 | | | | widht | | | ratio | | 185 x 80% x 2 Convert mm | 148 x 2 =296mm to inches | | 296 / 25.4= 11.653 inches Wheel diameter 11.653 + 14 inches =25.65 inches Overall diameter
205 70 14 205x70% = 143.5 143.5 x 2 =287 mm 287 / 25.4 =11.299 11.299+ 14 inches = 25.299 Overall Diameter On my westie i have 205 70 14 I didn't notice a lot a difference on the speedo betwen 185/ 80 to 205/ 70 I think bentley shop manual say in fourth gear you have 18 mile per hour by 1,000 rpm so at 4,000 rpm you should be around 70 or 72 mph I'm just betwen these two Denis Bélisle Saint-Basile le grand Québec Canada 85 westie |
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