225/40-R18 tires are 1.24 inches (31.5 mm) smaller in diameter than 235/45-R18 tires and the speedometer difference is 4.7%. In the tire comparison table above, you can see a detailed calculation of the size difference between 245/45 R17 and 245/40 R17 tire. The calculation results are presented in the form of visual infographics, on which tire with size 245/45 R17 is on top, and tire with size 245/40 R17 below. Both in the table and in the graph, the tires are +40 offset means that the mounting point of your wheel is 40 mm away from the centerline, towards the street side. Most vehicles come with a factory offset of about +12 to +20. In this case, assuming that your original offset was zero, if you switch to a +40 offset rim, your wheel will be tucked in by 40 mm. The same applies to negative offset Re: 35 vs 45 offset..? I'm no expert but my winter wheels are a 43et and i put 20mm in the rear and 10mm in the front to make the wheels stick out to the fender. I think the 35 offset is what you are looking for. C6A6 3.0t Avant. @avantneil. @avantoberfest. @skiguardusa www.skigaurd.com. 03-18-2009 07:58 PM #3. 2 days ago · Performance all season tires (17) Performance all-season tires provide year-round grip tuned for enthusiastic driving. They are a step up from regular all-season tires, and they place more To determine offset, use the following calculation: offset = 25.4 x (backspacing -.5 x full rim width) So for instance, if you have a wheel that has a size of 20x9, then the actual width is most likely 10 inches wide. If the backspacing is 7 inches, then the calculation is as follows. offset = 25.4 x (7 - .5 x 10) 235/45-R17 tires are 0.35 inches (9 mm) larger in diameter than 225/45-R17 tires and the speedometer difference is 1.4%. 225/45 18" will increase diameter by 4.8% (thus exceeding the 3% rule) and the sidewall height by 15mm, that is a very close call, on my rough calculations, for rubbing while cornering. 215/40-R18 vs 225/45-R18 Tire Comparison - Tire Size Calculator I think 215/45 18" should fit without problem the tire fenders even while steering around. In the tire comparison table above, you can see a detailed calculation of the size difference between 225/40 R19 and 225/45 R19 tire. The calculation results are presented in the form of visual infographics, on which tire with size 225/40 R19 is on top, and tire with size 225/45 R19 below. Both in the table and in the graph, the tires are Compared to 235/75R15, the sidewall height of 265/70R16 is 4.93% greater. This means the 265 tires will offer a smoother ride whereas the 235 tires will offer better grip on muddy road conditions. Sidewall height denotes the measurement between the edge of a rim and the top of a tire. The greater the sidewall height, the smoother the ride, and WrVXx2g.