Inthe tire comparison table above, you can see a detailed calculation of the size difference between 235/65 R18 and 245/60 R18 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/65 R18 is on top, and tire with size 245/60 R18 below. Both in the table and in the graph, the tires are 23545-18 235/40-19 Difference; Diameter inches (mm) 26.33 (668.7) 26.4 (670.6) 0.07 (1.9) 0.3%: Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%: Circum. inches (mm) 225/45/R18 vs. 225/40/R18. Jump to Latest Follow 235/40 is even closer at ~25.402" OD, so if he's planning on going with wider aftermarket wheels like he was thinking about, then that'd be the best choice for performance and looks. But with the stock rims, then yeah, 225/45 is looking like a really good choice. 5381 Better Fuel Economy Factory Ratios Increased Power. 235/60-R18 tires are 0.47 inches (12 mm) smaller in diameter than 245/60-R18 tires and the speedometer difference is 1.6%. Thefirst number 235 is the tire width in millimeters. The 2nd number 55 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 235/55 R 18 tire is 60% of 235 = 192. The 3rd number 18 (generally The2nd number 45 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 225/45 R 18 tire is 60% of 225 = 192. The 3rd number 18 The235/45R18 Run Flat tire has the following features: the first three digits 235 refer to the width of the tire in millimetres. The second two-digit number 45 refers to the ratio between the height of the sidewall and the width of the tire. R stands for “Radial” and the last two figures 18 indicate the wheel diameter in inches. 23545-R18 tires are 1.02 inches (25.8 mm) larger in diameter than 215/55-R16 tires and the speedometer difference is 3.8%. Thecalculation results are presented in the form of visual infographics, on which tire with size 235/65 R18 is on top, and tire with size 275/65 R18 below. 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. MWsuoh.

235 45 r18 vs 235 40 r18