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: Wheel diameter for 225x50x16 is calculated : (widthxprofile/50)+(wheel diam*25.4) = 631.4 mm : therefore circumference (pi x diam) = 1982.6 mm : which is equal to 0.001232 miles : to get top speed, rev limit x gear ratio x final drive x circumference : in this case, for an NA in 2nd gear and 7200 rpm would be : 7200 x 1.93 x 4.08 x 0.001232 miles or 69.84 miles per hour. : (for other tire widths change above numbers) : (for other gears or TT the following is relevant: : gear ratios: : 1st 3.21
: 2nd 1.93
: 3rd 1.30
: 4th 1.00
: 5th 0.75 : final drive
: NA: 4.08
: TT: 3.69 : ------- I do it slightly differently (I shun the metric system LOL), but the end result is the same. I take the tire circumference and convert it into feet.
(225 mm * .5 * 2) / 25.4mm per inch = 8.858", 8.858" + 16" = 24.858" * pi = 78.09455" / 12 inches per feet = 6.507' (7000 rpm x 6.507') / ( final drive x gear ratio x 88)
ie 1st gear-> 45,555.1549 / (4.08 * 3.21 * 88) = 39.5266 mph
Later,
Phuong
 Rice Land
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