245/35-R20 tires are 0.35 inches (8.9 mm) larger in diameter than 235/40-R19 tires and the speedometer difference is 1.3% 245/70-R17 tires are 0.37 inches (9.5 mm) smaller in diameter than 235/75-R17 tires and the speedometer difference is 1.2%. 245/50-R17 tires are 0.39 inches (10 mm) larger in diameter than 235/50-R17 tires and the speedometer difference is 1.5%.
The 245/75r16 tire has a width of 9.65 inches (245mm), which is slightly wider by 0.39 inches (10mm) or 4.1% compared to the 235/85r16 tire width of 9.25 inches (235mm). The wider tire might offer a marginal increase in surface contact, providing slightly improved grip and traction. However, wider tires might also experience more drag
235/50-R18 tires are 0.43 inches (10.9 mm) smaller in diameter than 245/45-R19 tires and the speedometer difference is 1.6%.
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245/60-R15 tires are 0.47 inches (12 mm) larger in diameter than 235/60-R15 tires and the speedometer difference is 1.8%.

\n \n\n\n235 45 vs 245 40
A 245 40 18 tire has a slightly taller dia (less than .2") than a 235 35 19. If you use the same type/brand tire the tire height would look virally identical. The rim offset on different rims will fool the eye to make fender well more filled. The slightly decreased (45 vs 50mm) offset will make it look fuller and more aggressive. The first number 235 is the tire width in millimeters. The 2nd number 50 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 235/50 R 18 tire is 60% of 235 = 192. The 3rd number 18 (generally preceded by an "R") is Rim Diameter in inches. 4551. 5288. Better Fuel Economy Factory Ratios Increased Power. 245/55-R19 tires are 1.93 inches (49 mm) larger in diameter than 245/45-R19 tires and the speedometer difference is 6.5%. .
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    • 235 45 vs 245 40