Metric off road tire sizes in 15" rims?

[Dalaigh]

I'm looking at getting some new tires this summer and I'm looking at 32" tall tires. I know there are 32/11.5/15's, but I was wondering what tire sizes in metric are close to or the same as these. Narrower tires would be even better.

[76stepsidechevy]

looks like a 295/75r15. you can play around with this a little bit to see what more common sizes actually measure out at. http://www.redrock4x4.com/tireconversioncalculator.html

[space wrangler]

265/75/16 best fits your description. ..

[wilkin250r]

Originally Posted by space wrangler

265/75/16 best fits your description. ..

Metric tire sizes aren't as straight-forward as tire sizes measured in inches. You can bet a 33/12.5/15 is almost exactly the same size as a 33/12.5/16 with the only change being the rim diameter. That same pattern does not hold true with metric tire sizes. I'm betting he's looking for a tire to fit his existing 15inch rims.

265/75/16 means 265 millimeters wide at it's widest point (usually the sidewall), 75 means the sidewall is 75% as tall as the width (in this case, 265*0.75=199mm). To get total tire height, add two sidewalls together (top and bottom), then add the rim diameter. To convert millimeters to inches, divide by 25.4.

Great. What does that mean for the original question? It means unless you enjoy number crunching, going the other direction with the calculations is an exercise in self-punishment (I didn't get punched in the face enough as a child, so I've done the calculations several times). 265/75/16 is about a 32/10.5 tire, but because the tires aren't calculated in size the same way, if you use the same 265/75 but use a 15 inch tire instead, it becomes equivalent to the very common 31/10.5/15 tire size.

Unfortunately, 295/75/15 or 285/75/15 would indeed be the equivalent metric size, but I don't see them. I use TireRack.com as my general guideline of what is commonly available, and they don't list a single tire in those sizes. That doesn't mean they don't exist, but it is a pretty good indication that they aren't common.

If you feel like buying 16 in rims, however, the 265/75/16 would indeed be right about 32 inches tall, and is a very common tire size that you could probably get just about anywhere.