The calculation results are presented in the form of visual infographics, on which tire with size 225/45 R18 is on top, and tire with size 225/40 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. 59. € ,18. Vendu par Proakcess. Chaines neige 9mm MATIC 140 - automatique - 255 50 R17, 225 60 R18, 245 50 R18, 235 45 R19, 255 45 R19, 235 45 R20 et +. SNÖPRO. 78. € ,90. Vendu par Proakcess. Chaussettes et chaines neige achat en ligne au meilleur prix sur E.Leclerc. 235/40-R18 tires are 1.34 inches (34.1 mm) smaller in diameter than 225/55-R17 tires and the speedometer difference is 5.0% Brought a set of alloys wheels + TS850P (225/40 R18)s for winter use. Swapped out ContiSportContact 5Ps (230/35 R19)s which are great but stop working at temperatures lower than 10degC. These are really confidence inspiring on the ungritted roads that I have to transit every morning and evening. Top 3 Avon ZV7 Reviews. Given 90% while driving a BMW 320D M Sport (225/40 R18) on a combination of roads for 2,000 spirited miles. Great dry grip in any direction! Wet grip is excellent when starting and stopping; they do slide a bit when pushed to the limits although you do have to push it very hard! The first number 225 is the tire width in millimeters. The 2nd number 40 is used to calculate the sidewall height or "aspect ratio", by percentage. So, the sidewall height of a 225/40 R 18 tire is 60% of 225 = 192. The 3rd number 18 (generally preceded by an "R") is Rim Diameter in inches. 235/45-R18 tires are 0.42 inches (10.6 mm) smaller in diameter than 225/55-R17 tires and the speedometer difference is 1.6%. G4SyKA.

225 45 r17 vs 225 40 r18