235/40-R18 tires are 0.93 inches (23.5 mm) smaller in diameter than 235/45-R18 tires and the speedometer difference is 3.5%.
700x40c is the measurement of your bicycle tire and is sized according to what used to be known as the ‘French system’. ‘700’ is the nominal diameter of your tire, measured in millimeters. ‘x’ just means multiplied by. ‘40’ is the second number and is the nominal tire width, also measure in millimeters.
There are a few key differences between 31 and 35-inch tires. The most obvious difference is size – 35-inch tires are significantly larger than 31-inch tires. This can impact several factors, including ground clearance, handling, and fuel economy. I n general, 35-inch tires will provide better ground clearance and off-road performance, but
255/40-R19 tires are 0.63 inches (16 mm) smaller in diameter than 275/40-R19 tires and the speedometer difference is 2.3%.

295/45-R20 tires are 1.16 inches (29.5 mm) larger in diameter than 295/40-R20 tires and the speedometer difference is 3.8%.

235/40-R19 tires are 0.93 inches (23.5 mm) larger in diameter than 235/35-R19 tires and the speedometer difference is 3.5%. Better Fuel Economy Factory Ratios Increased Power. vs 225/45-17 vs 225/50-17 vs 275/40-17 vs 235/45-17 vs 255/45-17 vs 255/40-17. 255/40-R17 tires are 0.65 inches (16.5 mm) smaller in diameter than 245/45-R17 tires and the speedometer difference is 2.6%. 235 tires offer less rolling resistance as compared to the 255 Tires. As a result, the 235 offer better gas mileage. Cars using the 235 tires can only carry a lighter load, while the 255 Tires can carry a much higher load. The 235 have a narrower width and are therefore less stable than the 255 tires with a wider width.

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 245/40 R19 and tire 255/40 R19 is significant.

The only reason I would go with the higher speed rating tire is if you drive aggressively/track the car, or plan on heavily modifying it for more power, better suspension. Whiteline tranny insert, JLT intake, SOLO performance turbo back, Tune+ tune w/WG, Mishimoto IC, BMR CB05, Steeda Diff bushings. 225/40-R19 tires are 0.89 inches (22.5 mm) smaller in diameter than 225/45-R19 tires and the speedometer difference is 3.3%. .
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    • difference between 40 and 45 tires