Note: Charts are below the text.
Rim width and tire width are two closely related sizes. Flexible tire sidewalls alow a single tire size to be mounted on a rim of various widths. Actually, there is an approved rim width range for every tire size, but on the other side, there is a tire width range for every rim size, specifically, rim width.
When replacing a rim or a tire with a wider one you could ask a question in two different ways:
What rim widths fit to my tire? (e.g., 195/65 R15)
The answer would be: "Rim widths corresponding to the tire size 195/65 R15 are: 5.5, 6.0, 6.5 and 7.0 inches". The information related to other tire sizes can be found in Wheel/Rim Size Calculator.
Now, question and answer for it that charts on this page should provide. If you want to mount a wider or a narrower tire on the existing rim you could ask the question:
What tire widths fit to my wheel/rim?
When replacing OE(original equipment) tire with a wider aftermarket tire, the width of rim should be taken into account because each rim width corresponds to only a few tire widths.
For example, appropriate tire widths for the 6" rim are from 165mm to 235mm. Equivalency tables presented below could help you to make a rational decision about the tire size(i.e., tire width) you need for a given wheel/rim dimension(i.e., rim width).
All the time we speak only about the relation beween the tire width and the rim width.
These charts, as an addition to our tire4rim calc, should be used along with our rim4tire calc, which complements first two. If you choose a tire dimension in these charts or in the tire4rim calc, do one more check in the rim4tire calc for the selected tire dimension, to double check if the selected tire size has your existing rim in the acceptable rim width range.
Which tire width to choose from the tire width range?
Every tire width and aspect ratio combination, listed below specified rim width, can be mounted on the rim width, but which tire width is the most appropriate for the specified rim width?
The tire measuring rim width, which stems from the tire size could help. You already have the tire width, the aspect ratio, the rim diameter, that is, you have the full tire dimension. if your rim width is closer to the measuring rim of selected tire, there is a greater chance that the chosen tire is more likely to fits your rim.
Every tire has its own measuring rim. In other words, the nominal tire dimension becomes the real tire dimension when fitted on the appropriate measuring rim.
For the specific rim width and adequate tire dimensions try out our Tire size for rim size/width calculator which tells you what tire sizes to pick - for entered rim size(i.e., rim width).
Tire widths for a wheel/rim size chart - Equivalency table
Tire widths for a wheel/rim size charts show what tire widths fit to the specific wheel/rim size i.e., show the tire width range for a given rim width. E.g., for the 7" rim width, following tire widths can be fitted: from 185mm to 275mm.
In the charts, beside each tire width, there is one more part of the tire dimension: aspect ratio(i.e., tire profile or tire series). The tire series is the ratio between the tire section height(i.e., tire sidewall height) and the tire section width (i.e., tire width). Series = tire sidewall height / tire width.
If two tires have the same tire width, but different series: first has 50, second one has 30, that means that the second tire has smaller tire sidewall height(lower profile) in relation to the first, rims will be closer to the road.
The tire width and the series are connected when we talk about tire to rim fitment. The reason for this is that for every tire series there is a different rim width / tire width ratio (specified by the tire associations). The ratio is used for determining the measuring rim for the tire. In other words, lower aspect ratio means that you can use wider rim for the same tire width.
Important notes about tire to rim fitment:
Actual tire dimension depends on a rim on which the tire is mounted. The nominal tire dimension is imprinted on the tire sidewall, but the tire gets its real dimension only when mounted on the rim. That's the reason why a measuring rim exists for every tire dimension.
Next important info is that the tire width changes for about 5mm (2/10") for every 0.5" (inches) change in the rim width, in the approved rim width range for the tire.
Suppose you have the tire 195/65 R15 on the 6" rim width (6"x15"). If you changed the rim to 7"x15", the rim width would be increased by 1". According to the previous rule, when you mount the tire 195/65 R15 on that rim, the actual tire width will be 195mm + 10mm = 205 mm.
The type of rim, that tire is designed for, is also important.
All these things affect the overall tire diameter, which is important to stay in permissible limit, during the process of tire replacement.
The data presented here are for Metric tires, no P-Metric, although, they may be similar, there can be differences. Also, the LT tires are not included, etc. These charts are only for the passenger car metric tires.
The charts are a compilation of data from year books of renowned tire manufacturers, and it may not be in accordance with the newest data, so please, always check data from these charts with tire manufacturers or tire specialists!
For more rim dimensions and adequate tire dimensions try out our Tire size for rim size/width calculator which tells you what tire sizes to pick - for any rim size.
Please note that these charts should be used only as a reference and they should be verified with tire/wheel manufacturers. They are for informative purposes only. The tyresizecalculator.com is not responsible for any errors that may arise with their usage.