Better Fuel Economy Factory Ratios Increased Power. 245/40-R19 tires are 0.96 inches (24.5 mm) smaller in diameter than 245/45-R19 tires and the speedometer difference is 3.5%.
In the tire comparison table above, you can see a detailed calculation of the size difference between 225/45 R17 and 225/50 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 225/45 R17 is on top, and tire with size 225/50 R17 below. Both in the table and in the graph, the tires are
225/45-R17 tires are 0.06 inches (1.5 mm) smaller in diameter than 255/40-R17 tires and the speedometer difference is 0.3%.
Its pretty simplethe profile is the sidewall heigth as a percentage of the treadwidth. So on a set of tires that are 215mm wide, a /40 profile tire would have an 86mm tall sidewall, and a /45 profile tire would have a 96.75mm sidewall. So that's about a quarter inch of difference between the two, which as stated isn't going to be very visible.
Both in the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 245/45 R18 and tire 235/50 R18 is significant.
225/35-R18 tires are 0.89 inches (22.5 mm) smaller in diameter than 225/40-R18 tires and the speedometer difference is 3.6%.
. 188 173 352 382 288 75 41 49 324
difference between 40 and 45 tires
