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kenchan · 09-16-2015, 04:47 PM

it's easy to do the calculation

width x profile (%) x 2 + 19" x 25.4 = total diameter in mm

Sport front tire: 245/40/19 would be: 245 x 0.40 x 2 + 19 x 25.4

use that to find the size and profile you want just change the 19" to 20".

09-16-2015, 04:47 PM	#4 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	it's easy to do the calculation width x profile (%) x 2 + 19" x 25.4 = total diameter in mm Sport front tire: 245/40/19 would be: 245 x 0.40 x 2 + 19 x 25.4 use that to find the size and profile you want just change the 19" to 20".