![]() Tire size and speedometer accuracy are directly linked to each other. You might ask: do bigger tires make your speedometer faster? The answer is no. Is it okay to change all four tires with a different aspect ratio?Ĭan I Change Tire Sizes? … That said, the only dimensions you can change are the width and aspect ratio - never the wheel size, unless you buy replacement wheels - and you should always strive to keep the total height of the tire the same as the OEM. The difference in circumference is 529.3″ for the 45 and 494.0″ for the 40, or 7% more. That is because the aspect ratio is the height of the tire’s cross-section - its profile - divided by its width, sometimes called the section width. The lower the aspect ratio, the wider the tire. Or more accurately, high performance and aspect ratio. The 75 definately “looks” better and might even get ya better mileage as you’re not turning as fast…. so 1/2″ more sidewall… not a lot of difference. I think the 75 series tire is roughly 1″ taller than the 70 series…. The size you have is 3.09% smaller, so not recommended. It is recommended to stay within 3% of the original tire size on the car though. When you plus size wheels…the aspect ratio (height of the tire) decreases to compensate…and maintain the orig diameter/circumference. Yes…the wheel/tire combo has an overall diameter/circumference that should be maintained with 3% (+/-) the original spec. … Both 65 and 70 series tires can be categorized as all-season passenger tires, which generally have aspect ratios between 65 and 80, but a series 65 tire will give better response while a series 70 tire will offer a better, more comfortable ride. The higher the aspect ratio number, the taller the tire will be. It will have a slightly lower sidewall height, but should work fine. Again, wider tires are more costly than narrower ones because they need more rubber during construction. Bear in mind that wider wheels require more fuel due to their increased rolling resistance. But only if the rims on your car can accommodate tires that are 10-20 millimeters wider. However, this is only possible if your car’s rims can accept the larger millimeter. Can I use 225 tires instead of 235?Īre 225 and 235 Tires Interchangeable? Yes, they are. If a tire has an aspect ratio of 70, it means the tire’s height is 70% of its width. Tire makers calculate the aspect ratio by dividing a tire’s height off the rim by its width. Aspect ratio for most bias ply tires is somewhere around 80 or 90 percent. So if you have a 70-series tire, that means the sidewall height is 70 percent of the tire’s overall width. The aspect ratio is a percentage of the section width. Changing just the aspect ratio will affect the diameter of the tire. Longer answer: Overall diameter of the tire is what will affect your gearing and speedometer. Re: Change in tire aspect ratio affect speedometer? Quick answer: yes, but not much. Does tire aspect ratio affect speedometer? The best case scenario is to buy the same original equipment wheels that came on your vehicle. In addition, different sized wheels can lead to different sized tires which can be detrimental to your vehicle. Mismatched wheels will fit each tire differently causing uneven wear and tear. Is it OK to have two different tire sizes? While not immediately problematic, this rubbing can lead to steering issues over time. Tall tires may also rub against the inside of the wheel well. What happens if you use wrong tire size?Ĭhoosing too tall of a tire can result in a vehicle prone to rolling over, a dangerous concern for any driver. For instance, your vehicle has a set size of rims, but you can buy different sizes of tires to fit those rims, as long as the middle of the tires is the correct size. Wheels and tires are not interchangeable words. Can I use a tire that is a different size? A letter R following the tire aspect ratio identifies the tire’s construction as a radial tire. … The higher the aspect ratio, the taller the tire sidewall. How does aspect ratio affect tires?Īspect ratio is simply identified as a percentage of the section height divided by the section width. So long as you go with wider tread too, you can go as low an aspect as will fit your wheel’s width. If you put lower aspect ratio tire on the same diameter wheels, you need to compensate with a wider tread width in order to have the same overall tire diameter and keep speedometer and ECU accurate.
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