315/70/17 vs 35x12.50x17

[z0lt3c]

That is a good price for Duratracs. However if you like the Duratracs, check out the Kanati Trail Hogs made by Greenball.

A tire made by Goodyear in Ohio or a knock-off made by Kanati in Indonesia.

Somethings I am willing to spend a little more on.

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[PyrPatriot]

In addition, typical E rated tires achieve load ratings, and therefore stiffness, when run at the maximum PSI, which is typically 80. I would hazard a guess you are NOT running your tires at 80 PSI and thus your not actually riding on a fully stiffened E tire. If you are running at a more typical 35 PSI, you are at around 1/2 the tire max and have reintroduced some flex back into the tire. Where-as the C tire the max is 50 PSI and running at 35 PSI is much less a reduction.

The psi you run at is dependent on the load. A 6000lb JT isnt going to run as low a psi on pavement as a 4000lb JL. By my calculations I can run my 35s at 20psi and still have 6200lbs loadCl capacity on the tires. Outside a chalk test, the Falken service rep I emailed (who also Jeeps) says for my 6000lb rig 35psi is ideal

I read and read and read about all the options, loads etc . Decided on Falken Wildpeaks 315/70R/17” all terrain not mud terrains. It is the exact tire as the 35/12.5” 1/8” shorter and 1/4” wider than 35’s. Same loads and everything and $75 a tire cheaper when I got mine plus free delivery and it was the next day. The only difference is what’s blazed on the sidewalls. If you want to spend $300 more for a set of 4 to say 35/12.5/17” on the sidewall you have way more money than me. Just my opinion. They ride fine at 32psi and look and perform great.
$ 1031 to the door.

The difference in price between the 315 and 35 ATs is $30/tire right now. I hear what you are saying about $400 difference, but $150 is much more reasonable for those where an extra 1/8” means the difference between scraping and not, especially aired down, or the extra 1/4” width means your tire doesnt slip off a ledge or has more traction for mud. That being said my 32” M/Ts have kept up with the 35s run on lifted JLs

 

[LostWoods]

So wile we're on the topic, anyone find a good pressure to run their 315 load C KO2's? Not sure it really warrants a new thread.

 

[LostWoods]

The psi you run at is dependent on the load. A 6000lb JT isnt going to run as low a psi on pavement as a 4000lb JL. By my calculations I can run my 35s at 20psi and still have 6200lbs loadCl capacity on the tires. Outside a chalk test, the Falken service rep I emailed (who also Jeeps) says for my 6000lb rig 35psi is ideal

Keep in mind the load at any given PSI is more a logarithmic scale, not linear. If I remember correctly, it's also diminishing returns where you gain more per psi at low pressures. To be able to do the pressure correctly off a calculation, you'll need the engineering specs for the tires.

 

[PyrPatriot]

Keep in mind the load at any given PSI is more a logarithmic scale, not linear. If I remember correctly, it's also diminishing returns where you gain more per psi at low pressures. To be able to do the pressure correctly off a calculation, you'll need the engineering specs for the tires.

Companies often post their load index charts and it is a linear relationship more or less until below 35psi. I checked with Falken on their M/T 35s and it was essentially 34lbs per psi

 

[z0lt3c]

FYI-- Discount Tire has the BFG's on flash sale again for $100 + 5% off. (edit: but is now sold out!)

I got my tires 2 days after ordering them with a date stamp of 0920. Pretty happy on both fronts but man are these things monsters compared to my stock tire size! You don't appreciate how heavy they are until you see and lift them in person.

Also interested in feedback on PSI for the BFG 315.

 

[Digger70]

So wile we're on the topic, anyone find a good pressure to run their 315 load C KO2's? Not sure it really warrants a new thread.

I had them on my '15 JK and ran them at 32 psi.

 

[PyrPatriot]

I had them on my '15 JK and ran them at 32 psi.

JK weighs a lot less than JT. Might need higher pressure

 

[LostWoods]

I had them on my '15 JK and ran them at 32 psi.

JK weighs a lot less than JT. Might need higher pressure

I'm holding around 35 right now and was going to adjust as I go. The Raptor is 38psi stock and these are the OEM tires for those so I'm guessing I'm probably pretty close if 32psi is good for a Wrangler.

 

[Pat2Alaska]

So wile we're on the topic, anyone find a good pressure to run their 315 load C KO2's? Not sure it really warrants a new thread.

Mine drive best at 28 lbs on road. Off road I air down to 12 on most trails

 

[z0lt3c]

I just got the tires mounted and balanced, but not installed, as my lift goes on tomorrow. Unfortunately one tire took a lot of weight. I guess I will keep this one in the rear but a little disappointing for first rate tires.

 

[LostWoods]

It's something that's unavoidable with large tires. I think mine were between 3-9oz each.

If you are really concerned about it, get a Road Force balance done. Takes an hour to do 4 but they can locate the high spot on the tire which will minimize the weight required when installed correctly.

 

[z0lt3c]

Here the BFG 317's on my JT Sport with a 2" front and .75" rear lift:

I put about 200 miles on the tires immediately after driving out of the shop. I am very impress with how quiet the tire is, does not drive anywhere near as aggressive as it looks. It's exactly what I was looking for. I am running at 34 psi right now but I think the sweet spot is closer to 30.

Even with the lift, we had to remove the bumper wings, so no way these fit on a stock JT SPORT without bumper modification.

 

[PyrPatriot]

35x12.5x17. Completely stock JT, even the wheels, except for the bumper (which can be stock)

 

[z0lt3c]

35x12.5x17. Completely stock JT, even the wheels, except for the bumper (which can be stock)

That's not a Sport bumper. You don't have the wings between the bumper and fender that causes the tire obstruction. Even with a 2+" lift these will need to be removed. Of course, also a good excuse for a new bumper.

Before

After

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