275/40-R18 tires are 0.37 inches (9.5 mm) smaller in diameter than 255/45-R18 tires and the speedometer difference is 1.4%.

275/45-R17 tires are 1.08 inches (27.5 mm) larger in diameter than 275/40-R17 tires and the speedometer difference is 4.0%.
40" Tire Diameter 40X16R16. 41" Tire Diameter 41X14.5R16. 42" Tire Diameter 42X14R16 45" Tire Diameter 45X14.5R20. 46" Tire Diameter 46X19.5R20. 49" Tire Diameter
235/45-R18 tires are 1.24 inches (31.5 mm) larger in diameter than 225/40-R18 tires and the speedometer difference is 4.7%. Aspect Ratio Of 295 Tires. The aspect ratio of the 295 tires ranges from 40 to 75. Width Of 295 Tires. These tires feature a good section width of 11.614, which gives your car greater grip and improves its on-road and off-road handling and maneuverability. Rim Diameter Of 295 Tires. The 295 tires are compatible with 16-24 inch wide rims. 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. Overview of 10-Ply. 10-ply tires are much thicker compared to 4-ply; hence they should last much longer when utilized for towing, hauling, or off-roading. When used for hauling and towing, these tires thrive because they can better load control without wobbling at high speeds. They are constructed to provide more stability to your truck than 42 – 44 mm wide. Adding 4 mm to the width of your tires gives you some added plushness – compared to 38 mm, you’ve increased the air volume by 22%. In exchange for that added cush, you lose a little bit of connection to the road. To me, that isn’t a big loss, and I enjoy the greater traction and go-almost-anywhere capabilities of the
The recommended rim width for the 225 is 7.5 to 9 inches. The recommended rim width for the 245 is 8 to 9.5 inches. You will have some overlap making the tires compatible in certain cases. 225/45 R18 vs 245/40 R18. There is not going to be much difference between these two tire examples.
225 vs 245 tires: So when someone mentioned their tire size is 225/45 R17, what does this actually mean? 225 actually denotes the width of the tires in mm. For example a 225/45R17 tire size, it means that the width of the tire is 225mm (~ 8.9 inch) wide. The picture below shows an illustration of the 225mm length tire width.
A basic way to distinguish the two letters R is to look at their position in the sequence. For example, a tire sequence can be P215/65R15 95H or P225/70R16 87R. In both cases, the first R (65R15 and 70R16) all imply radial construction. So the second R in the latter example (87R) would refer to speed rating. 95H in the first example is another
255/40-R19 tires are 0.63 inches (16 mm) smaller in diameter than 275/40-R19 tires and the speedometer difference is 2.3%. 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 That is a LOT of road so I'd go 40mm, unless that 25% is really rough - like semi-technical single track. Another important consideration is if you intend these tires to be slicks or to have tread. Given how much road your suggesting id be temped to go 40 mm with tread and 45 mm slicks to try and keep the road riding from getting to sluggish WZh1SZ.
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    • difference between 40 and 45 tires