#Tire metric to standard calculator how to

In this guide, I’ll teach you how to calculate the size of a tire and how to properly convert it from inches to metric form. No matter where you buy tires, you have to look at all three variables, not just the width. 35 inch wide tires are as wide as 315-millimeter tires, but the thickness and diameter of a tire should also be taken into consideration. However, more calculations go into the true size of a tire. Since America is the only country not on the metric system, what are 35-inch tires in metric? What Are 35-Inch Tires In Metric?ģ5-inch tires are about 315 millimeters in diameter. However, the measurements of a tire differ where you live. There are tons of different tire widths available, and you need the exact right size for your tire.

Also check your tyre's speed and load ratings in most cases the new tyre will need to match or exceed those ratings, except for offroad vehicles which can use N (140km/h) rated tyres.Buying the right size of tires can be a hassle.

Wider tyre may require wider rim road regulations may say permitted rim width is +/- 25mm from standard.

Your new tyre is more than 15mm taller - check that's legal, usually limit is +15mm for cars, +50mm for 4X4s.

Your new tyre is both taller and wider than the existing this will mean it is heavier, with effects on handling, fuel consumption etc.įor Australians, the following should be considered with regard to legality but check your specific situation:.

You are fitting a smaller rim ensure this fits your vehicle, especially front brake calliper clearance.

In most countries tyres cannot protrude from the bodywork, so consider wheel arch flares.

You are fitting a significantly wider tyre you may need a wider rim to suit.

As your tyre is taller, you should check fitment in spare wheel bays.

Your new tyre is taller so your speed will read low compared to true speed, Your gearing will now be higher fewer revs to maintain 100km/h.

Check the exact specs for your selected tyre in your selected size, and in particular: The measurements here are calculated from the general tyre specs in practice, actual sizes will vary a little from these measurements, particuarly offroad tyres which have deep tread. The following general guidance may be of use check whether it applies in your specific circumstances: Version 3 - coding & design by Robert Pepper NOTE: This calculator does not check the tyre sizes entered actually exist for your desired tyres. Email not stored or used for any other purpose.Īll figures approximate consult your tyre manufacturers exact specs e.g. Leave blank unless you want results emailed to you. Whatever you want to name this calculation, e.g. Any GPS app on a phone will work drive at GPS reading of 100km/h in a straight line on the level for 30 seconds. The width of the car probably won't change as the body should be the widest part of the car. Measure this, or use carmaker's specification. Enter your current tyre details Existing Tyre

There is also a calculator to convert tyre sizes to/from imperial and metric and you may also find the Towing Weights Calculator useful. If you’re not sure about tyre specs, then read the Tyre Help. You just need to know a few tyre specifications, then hit Calculate. See a graphic comparing the two tyre sizes.See what equivalent sizes there are to your existing and new tyres.Get some guidance about the effect on your vehicle of the new tyre.See the difference in ground clearance with a different sized tyre.See the difference a new tyre will have on your speedometer reading.Compare two tyres for example diameter and width.