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tire guru's????

A

Anonymous-0

Well-known Member
Hey folks,
Wife's car
(Kia Sorento) calls for either 245/70 r 16 or 225/75 r 16 tires. Looking for a set of straight winter tires and found plenty that are rated as the best thing since sliced bread for a bunch of money. Now, on my little car (Kia Sportage) has some off brand winter tires that you just can't get stuck. Closest I found was 235/70 r 16 and half the price of the popular ones.
Owners manual calls for the two sizes I posted, but I should be OK with the 235/70's shouldn't I?

Dave
 
Well the 225/75RX16 it a narrower tire I.E. the 2nd number tell you how wide a tire is the first number how tall it is and the last the rim size. So that 235/70RX16 would be a tire that would sort of fit between the other 2 you listed if they both said 70 or 75. I think the 70 is about a 1/2 wider then the 75 is. So say you have tires that number 205/80R or 205/75R 205/70R or 205/60R all in theory are the same height but the 80 is narrower then all the rest as is every one in progression and the 60 being the widest so yep you should be able to use the 235?70RX16 with no problems
 
My experience with tires over the last 40 years has been the satisfactory service I get out of a tire is inversely proportionate to the price I pay.

In other words, some of the worst tires I've owned have been high dollar, popular brands and some of the best have been el cheapo off brands that nobody ever heard of.
 
The P-metric tire numbering system works in this way. The first number is the tire width in mm. In your case either 245 or 225mm. The second number is the aspect ratio. This is a percentage of the width. In your case either 70% or 75%. This is the height of the actual sidewall of the tire. Therefore in your case both tires are near 29.5" in diameter (one is actually 29.3"). A 235/70/16 is 29" in diameter. Your speedometer would be off by about 2%.

I have found this website to be of assistance when looking at equivalent tire sizing: http://www.miata.net/garage/tirecalc.html

P.S. A 205/80/X is over 3 inches taller than a 205/60/X. Both are the same width.
 
Actually, I believe, when reading a metric tire size, the first number is the width in millimeters, the second number is the height of the sidewall from the wheel to the outer edge, as a percentage of the overall width (first number), and the third number is the size of the hole in the center.

With that said, if you were to want to spend the money, in my opinion, Michelin LTX A/Ts are the way to go. They provide good traction and will go at least 80K miles, if you don't travel much gravel.
 
As long as you change out all four tire you should be okay as the 235/70R16 falls right in the same size range as tires called for on the car. But remember that advice is worth what you pay for it.
 
aspect ration is height vs width in %, has nothing to do with width. 225= 225 mm wide, 75= sidewall is 75% of width (168.75 mm from bead to tread), 16" rim. complicated, for sure...what ever happened to a good ol' E78-14?
 
The 245/ 70 and the 225/ 75 will have just about exactly the same outside diameter, with the 245 being 20 mm wider. The 235/ 70 will be about 8.5mm (2 x 4.25) shorter in overall diameter.
These are all very common sizes over here...the better digging tire all other things being equal would be the 225 ( less floatation, more dig)
If you are looking at pure winter tires, look for a set of Blizzaks... in the 225/75-16, though, you should be able to find some real chaep stuff because that's also a commercial size
 
...you might also look for 205r16 and 215r16 sizes...both common Range Rover sizes, the right overall outside diameter and narrow will give good bite...plus, tread patters designed for Range Rover type applications.
 
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