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Old 12-16-2013, 08:54 AM   #1
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315-70-17 vs 35-12.5-17

I tried in vain to search for this as I have to believe its been discussed before but I could not come up with anything. So, I am looking to get a 2014 Rub X Unlimited and putting a 2.5 to 3.5" (TBD) lift kit on it with some sort of 35" tire. Most of the tires I am considering KM2, TOC, DT MTR (please don't debate here) come in both metric and standard sizes. Dimensionally, price,etc. they are basically the same. What would be the be the benefit one way of the other?

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Old 12-16-2013, 10:37 AM   #2
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When I was looking I rarely saw the same tire come in both 315/70R17 and 35x12.50R17 at the same time. I saw that one tire would come measured one way and a completely different tire measured the other way.

It really doesn't matter what system they use to describe the approximate size of the tire. The two sizes are basically the same, but vary slightly from one tire model to another. As long as it's the size you want you should focus on everything else about the tire that matters to you.

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Old 12-16-2013, 10:39 AM   #3
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Agreed. Worry about the tire (get what you want) rather than the size. What tire are you looking to go with?
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Old 12-16-2013, 11:15 AM   #4
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^^^ Yes, type of tire, Brand, and style, based on your Wrangler usage factor, is the most important. In other words, are you going to use it mainly on the pavement, or off road rock crawl, mudding, in the sand, back in the woods, and or a combination of all of that. So it's based on not only what you want, but more on what do you really need.............
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Old 12-16-2013, 12:43 PM   #5
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Pmetric and metric sizes are exactly the same, just different. LOL.
Keep in mind not all 35" tires are actually the same size. (or 305/70/17). Tire Rack have actual measurements (not on the vehicle though). A BFG KM2 is 34.8". A 35" MTR is 35". We're not talking much obviously. But my 305/70/17" KM2, basically a 34", was 33.5" on my Jeep. Great tire, not saying anything bad about it. Just FYI.
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Old 12-16-2013, 03:45 PM   #6
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Quote:
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Pmetric and metric sizes are exactly the same, just different. LOL. Keep in mind not all 35" tires are actually the same size. (or 305/70/17). Tire Rack have actual measurements (not on the vehicle though). A BFG KM2 is 34.8". A 35" MTR is 35". We're not talking much obviously. But my 305/70/17" KM2, basically a 34", was 33.5" on my Jeep. Great tire, not saying anything bad about it. Just FYI.
Most 35" tires barely break the 34" mark in actuall tire size. PitBull Rockers are one of the few.
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Old 12-16-2013, 04:23 PM   #7
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If you find a tire that has both "315" and "35" measurements take a look at load range/speed rating I bet one of those is different like these kooks for example the 315 are D rated and the 35s are E rated.

Tire Details - Discount Tire Direct


Tire Details - Discount Tire Direct

Links for both.
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Old 12-16-2013, 05:42 PM   #8
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Those two sizes are not the same. 315 70 17 measures 12.4" wide and 34.362" tall. I would say that the width is "basically the same", but the height is different.
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Old 12-17-2013, 08:58 PM   #9
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I recently put 315-70-17 Nitto Trail Grapplers on stock wheels. Per Discount Tire the 35-12.5-17 would not fit the stock wheel due to the approved wheel/rim specs.

If you look at Nitto's web site you will see;

315-70-17 (D rated) are 34.61" overall diameter, 13.27" overall width
35-12.5-17 (E rated) are 34.84" overall diameter, 13.19" overall width

The 315's are .23 inches less in diameter but .08 inches wider.
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Old 12-17-2013, 09:15 PM   #10
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Please explain how a tire that is 12.5" wide is 13.19" wide.
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Old 12-17-2013, 09:30 PM   #11
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Please explain how a tire that is 12.5" wide is 13.19" wide.
The measurement written on the side of the tire rarely matches the actual size of the tire exactly.
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Old 12-17-2013, 09:59 PM   #12
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I'm aware of that, but not that much difference. Most of the variance is due to how it sits on any particular vehicle. A 12.5" unmounted tire should measure pretty close to 12.5". Otherwise call it a 13" wide tire.
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Old 12-17-2013, 10:24 PM   #13
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That is tread width. The body of the tire may be slightly wider where it bulges.
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Old 12-17-2013, 10:39 PM   #14
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Per the Goodyear website...the 12.5 refers to the section width. Section width is defined as the measurement between the widest point of the outside sidewall to the widest point of the inner sidewall.

Tire Rack also has some information on section width as well.

I am thinking that the width of the tire has been used as an industry standard and hasn't been changed despite tires being wider than the industry standards?
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Old 12-17-2013, 11:14 PM   #15
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Quote:
Originally Posted by RedSectorA View Post
That is tread width. The body of the tire may be slightly wider where it bulges.
That makes sense.
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Old 12-18-2013, 04:46 AM   #16
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Quote:
Originally Posted by HunterTheBeagle View Post
If you find a tire that has both "315" and "35" measurements take a look at load range/speed rating I bet one of those is different like these kooks for example the 315 are D rated and the 35s are E rated. Tire Details - Discount Tire Direct Tire Details - Discount Tire Direct Links for both.
Definitely would recommend a tire with a load index of 119 or less.
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Old 12-19-2013, 10:39 PM   #17
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Seems to be load rating is the big difference. Since the vehicle weight is relatively low and I'm not going to overload it or tow with it, the radials lower rating would be better for me.
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Old 12-20-2013, 05:18 AM   #18
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Seems to be load rating is the big difference. Since the vehicle weight is relatively low and I'm not going to overload it or tow with it, the radials lower rating would be better for me.
The MTRs; while there are several biased posts about improbable issues, have got to be on everyone's short list of best all-around 35x12.5 MT.
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Old 12-20-2013, 11:55 AM   #19
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Quote:
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Definitely would recommend a tire with a load index of 119 or less.
Out of curiosity, why do you recommend this? I'm not very familiar with load ratings, but I always hear people say under 121...
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Old 12-20-2013, 12:15 PM   #20
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Out of curiosity, why do you recommend this? I'm not very familiar with load ratings, but I always hear people say under 121...
Heavy load ratings make the tire much stiffer. The stiffer the tire, the harsher the ride.
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Old 12-20-2013, 02:32 PM   #21
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my duratracs d rated 315s measure 33 3/4 mounted on the jeep
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Old 03-15-2014, 04:09 PM   #22
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The MTR's with kevlar are 315 70 17, load range D and the 35 x12.50 17 are load range C
Pretty close in size, the big difference I see is the load rating.
Any input between the D and C load range on these tires ??
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Old 03-15-2014, 05:06 PM   #23
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LT (Light Truck-35x12.5-17) tires have always been the tires designed for Pickups, Jeeps (a Jeep is neither) and SUVs due to the higher loading capability and higher CG of these vehicles. The LT-metric (315/70-17) are metric equivalent that the industry created to satisfy manufacturers need for global standardization. The globe is metric. In the past only P-metric (Passenger) tires existed and this extended the solution across the board.

Some LT-metric still have passenger like bias (less plies lower, max air pressure, tougher beads) as requested the OEMs to improve ride quality. Sometimes they are identical but other times they are not. This varies by tire manufacturer and even by tire size because an OEM may use that tire size. Just compare all of the specs for the LT vs the comparable size LT-metric and pick the one that best fits your needs.

It's best to have choices.
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Old 09-24-2014, 12:15 PM   #24
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So if I'm looking for a all terrain/winter tire for daily driving and occasional moderate trail, Is a P-metric size OK? Or should I spend the extra cash on an LT size to get a more durable tire.

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