DavantiGuarantee. One Year Tyre Life Guarantee. 215/45/R17 / Load 91 / Speed W. Mileage. Dry Roads. Wet Roads. Low Noise. More Info. Add to Quote. Tyrereview data from 34 tyre reviews averaging 67% over 374,820 miles driven.. The Noble Sport NS20 is ranked 117th of 199 Summer High Performance tyres.. Latest Tyre Test Results. 2020 Auto Bild UHP 19 inch Tyre Test - 9th of 10 tyres. Positive - High aquaplaning resistance, low price.; Negative - Dangerously long wet and dry 22545-R17 tires are 2.19 inches (55.5 mm) smaller in diameter than 215/60-R17 tires and the speedometer difference is 8.1%. Compare215/45 R17 vs 245/40 R17. Tire Size and Comparison Calculator calculate tire diameter from code and compare speedometer differences for tire sizes. The first number 21550R17 = 25.5X8.5R17 225/45R17 = 25x8.9R17 225/50R17 = 25.9x8.9R17 235/45R17 = 25.3x9.3R17 245/45R17 = 25.7x9.6R17 255/40R17 = 25x10R17 265/40R17 = 25.3x10.4R17 40" Tire Diameter 40X13.5R24 40X14.5R24 40X15.5R24. 42" Tire Diameter 42X15.5R24. Tire Height Calculation Chart for 26" Wheels. 31" Tire Diameter Inthe tire comparison table above, you can see a detailed calculation of the size difference between 235/45 R17 and 255/40 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 235/45 R17 is on top, and tire with size 255/40 R17 below. Both in the table and in the graph, the tires are TireRack did some VERY detailed testing of 215, 225 and 245 width tires on 17x7, 17x8 and 17x9 Enkei RPF1 BRZs! Reactions: I would have been interested in 225/40/17 vs 225/40/18, for science. Reconsidering a 225/45r17 RT660 instead of 245/40r17 on a 17x9 wheel for track/spirited jaunts. Looks like it was the Tiresize comparison 215/55 R17 vs 225/45 R18 Calculate CM INCHES If your speedometer reads: Real speed is: Size difference between 215/55 R17 and 225/45 R18 tires. In the KF7dOm.