After driving this set of 5 GoodYear Duratrac 315/70R17 tires for 34,000 over 18 months with two winters in Lake Tahoe, it was time to take them off and install a set of 37/12.5/17 MT/R Kevlars to head out to Moab for Easter Jeep Safari to run with the big dogs.
The intent of the video is to share with you a set of five tires that has been wheeling across Moab, Death Valley, and countless days on the Rubicon Trail. This set of tires has served me fantastically in two seasons of snow, ice, rain, mud, slickrock, sand, and highway travels for a year and a half. As you can see after 34,000 miles these tires still have plenty of service life tread left on them.
After watching the video I hope to settle some of the disparity of opinion on the forums about how this tire performs and lasts. Note I never tore a sidewall wheeling them, which included all around Northern Nevada which is known for having many sharp-edged rocks throughout the trails of the Sierra Nevada. In my opinion, people who are tearing sidewalls are most likely spinning the tires and thus tearing the tires. I’ve not seen a tire sidewall tear when wheeling at a speed that was obstacle appropriate in either a D or E rated tire with 2 or 3 ply equivalent sidewall ratings. Just my experience, but I think if you are going to tear a sidewall on 35s or 37s on a 4,000-5,000 pound truck you’re probably driving too fast over the obstacle so as the tire does not have time to conform, or the driver should have avoided the obstacle altogether by taking another line. Our rock krawling Wranglers aren’t 3/4 ton Raptors hauling ass at 100mph across the desert and shredding tires in every conceivable manor.
About the dimensions of the tire, Goodyear lists the 315/70R17 at 34.4 inches in diameter. It’s the largest 17″ rim Duratrac tire they offer. After you install the tire on your truck the tire is going to be compressed and the diameter will be reduced. You now will have an “EFFECTIVE DIAMETER” which is dynamic in shape when you drive, but static in diameter in it’s performance. At 42psi, on my 4,800 pound JKUR with lots of heavy duty steel aftermarket parts, the effective diameter was 33.75″. To get the accurate effective diameter of the tires I first used a tape measure of the tires height after mounted and then confirmed the specs with a GPS speed calibration tool on my iPhone to match the Superchips TrailDash settings for accurate speed and distance. No tire is the same diameter before and after installation because of differing rim width, truck weight, and PSI, so there will be many reasons why we all have a different effective diameters from the same tire.
I hope the video was informative and please leave a comment if you would like to share your thoughts. If you subscribe to the channel YouTube will notify you about our next product reviews and travels.
Now that my GoodYear 37″ MT/R Kevlars are now on my truck, I will follow up with a review after I get a chance to give them some trail time – Easter Jeep Safari Here I Come!
Let the good times roll! But not roll over.
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