255/45-R21 tires are 1 inch (25.5 mm) larger in diameter than 255/40-R21 tires and the speedometer difference is 3.3%.

The 215/45r17 tire has an overall diameter of 24.62 inches (625.3 mm), and the 225/45R17 tire has a diameter of 24.97 inches (634.3 mm). The difference in diameter between these two tire sizes is around 0.35 inches (or 9 mm), equating to a 1.4% difference. Since this is less than the recommended maximum difference of 3%, using a 225/45R17 tire

If you shop for them, you’ll notice that the 18-inch versions of aftermarket wheels are always more expensive than the 17-inch ones. A set of 18′′ wheels typically costs between $100 and $200 more than a set of 17′′ wheels. Additionally, tires that fit 17-inch alloy wheels rather than 18-inch wheels cost $10 to $20 less per tire.
Use our tire size comparison calculator to find all your tire comparison needs. Our tire size comparison calculator takes two tire sizes and directly calculates the differences between the tires diameter, width, sidewall, circumference and revolutions per mile.
Difference in diameter is relatively unimportant since the tire is not a solid disk. What is most important is the revs/mile of the two different tires. Using Tire Rack specs for representative 40 and 45 tires, the revs/mile difference between the two tires is less than 5 %, which is a pretty easy difference to accommodate.
difference between 40 and 45 tires
Better Fuel Economy Factory Ratios Increased Power. vs 255/45-19 vs 255/40-19 vs 245/50-19. 255/45-R19 tires are 0.35 inches (9 mm) larger in diameter than 245/45-R19 tires and the speedometer difference is 1.3%.
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 7z6mt.
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