Tyre size for rim size/width calculator tells you what tyre sizes to go for, for the size of your rim. For e.g., it gives an answer to the question: "I'm going for 6.5 x 15j rims. What's the best tyre size?"

The calculator can only show a possible tyre width range for the selected rim, specifically, rim width. It also shows minimum and maximum tyre widths. In the tyre range, next to each tyre width, there is another tyre dimension: a tyre series(i.e., tyre profile or aspect ratio). Both dimensions are important when the tyre is going to be fitted to the rim. The tyre series affects relation between the tyre width and the rim width. Read more in Tyre width for a rim size width chart and What is a tyre measuring rim.

The resulting tyre list lacks certain tire sizes, so it should not be considered complete. The calculator is only for the passenger car metric tyres. Tires in the list should not be all considered suitable for your car, because only a few of them or maybe, only one would satisfy a requirement that their overall diameter should be the same as your OE (original equipment) tire diameter.

So, when you find the tyre sizes, i.e., tyre width and series combinations that fit your rims use our Tire Size Calculator – Tire Dimensions, to compare them with your OE Tyre size to ensure that the selected tyres circumferences or diameters do not deviate too much from the OE Tyre circumference or diameter. This is extremely important for many reasons.

Notes: A Tire with higher profile(series) for the same tire width or the same profile for a wider tire width, has a higher tire sidewall, that means more comfortable ride. Wider tires create more traction on the road, resulting in reducing fuel economy.

Select your rim size and click on the button "Find Tyre Size". The calculator will then tell you what tyre sizes, that is, combinations of tyre width and aspect ratio you could choose for your rim.

Can I mount a smaller tire width than the one presented in the chart as the smallest, for the specific rim width?

Rim Dimensions

TyreSize4RimSize Calculator

select rim size

e.g. 6.5" x 15"


Please note that this calculator and its results should be used only as a reference, its results should be verified with tyre/wheel manufacturers or specialists. The tyresizecalculator.com is not responsible for any errors that may arise with its usage.

This calculator is only for the passenger car metric tyres.

This calculator complements our Tyre width for a rim width chart and should be used along with our Rim width for tyre width calculator, which complements prior mentioned calculator and chart. After you chose the tyre size, do one more check in the Rim width for tyre width calculator, for the selected tyre size, to double check if the selected tyre size has your existing rim in the Recommended rim width range. It's very important.

NOTICE: Tire widths/sizes presented in the resulting tables, as possible candidates for entered, specific wheel dimension, maybe aren't all suitable for your car. The tire widths/sizes listed above satisfy only one criterion in the quest for the new tire size, the one that says that the new tire width must be in a certain range in relation to the entered wheel width. That's not enough for the tire to rim fitment (read this).

Besides, it may happen that the resulting table doesn't contain all possible tire widths/sizes, that also might satisfy the wheel dimension entered, due to a lack of data.

When choosing new tire size for your car, one more thing(among others) you need to pay attention to, besides the tire width, is the overall tire diameter of the tire mounted on the selected wheel. The overall tire diameter of a new tire must be in a certain acceptable range, compared to the tire diameter of the OE tire.

To get more precise results you need to narrow down the resulting list of tire widths(tire sizes) by comparing its entries (you have: tire width, aspect ratio and wheel diameter) with your car's OE tire size. You can do that in the Tire Size Calculator – Calculates tire dimensions. It can tell you does your chosen tire satisfy criterion which depends on the tire diameter, as a result of comparing OE tire diameter with the chosen tire diameter.

By considering results of these two calculators, you should get a tire size that is more precise and suitable for your needs.

Again, the purpose of these calculators and charts isn't to give the final verdict what is the best for you needs, but only to give you a suggestion in your quest for the final answer. This area isn't so simple it might look on the first sight, it requires a tire professional with an experience and testing on the site(a tire service). So, be careful.

Also, check out our other calculators and charts:

Related articles: