tire combination for wider back tire

[mohammad bahzad]

currently the tires on my vehicle are as follows:

Front: 275/35R18
Back: 315/30R18

My problem is that the back tire size is not available where I live. I am thinking to change the tire size (width and ratio)
how can I choose tire sizes combinations and keep the car leveled?

Topic

[zero]

The most important thing is to match up the overall diameter. If you click on this link and click on the specs tab, you will see a set of more accurate dimensional information on the tire. And below, Tire rack actually lists similarly sized tires. So attempting to match up the overall diameter with something that can fit on a 10 inch wide rim I saw a few options. 285/40r18 and the same size as your front tires, 275/35R18. If your rims aren’t offset, matching the tire size would probably the best overall decision, then you could rotate them. You could even go with a 295/30r18, it would just put the car about a quarter inch lower, but the tread is still as wide as the 315.

[Cameron]

You want the F and R diameters as close as possible but they do not need to be identical.

If you cannot get the 315 tire for the rear then these 2 options for the REAR will be suitable if you can get these sizes where you are……

Front (current) 275 35 18 …..649 mm diameter

REAR….
305 30 18 …641 mm diameter
285 35 18 ….657 mm diameter

In each case there is only 8mm difference in diameter between Fr and Rr which is OK. (295 tires do not get you a close diameter match with the 275/35 on the front).

I would use the 305/30 /18 on the REAR if you can get it . For the 285/35 fitment the maximum wheel width is 10.5 inches so if you have 11 or 12 inch REAR rims you would need the 305/30 tire.

[Author]

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