Joined the 255 Club
- Thread starter daverami
- Start date
Gear
Explorer, Overland Certified OC0020
alexrex20 wrote "the Interco SSR Radial comes in 35x10.50-16, possibly the ultimate expo size for the vehicle that still likes to get down and dirty."
Thanks for the reply. I actually saw those and considered them, but I am concerned about the noise. By chance could you put a tape measure on one of your wheels. I would like to know the true height. As a side note my Goodyear MTR 315/75/16(35"tire) actually measures 33 1/2" on my Jeep.
Thanks
Thanks for the reply. I actually saw those and considered them, but I am concerned about the noise. By chance could you put a tape measure on one of your wheels. I would like to know the true height. As a side note my Goodyear MTR 315/75/16(35"tire) actually measures 33 1/2" on my Jeep.
Thanks
alexrex20
Explorer
Gear,
that's not my FJ Cruiser. i run the SSR in a smaller size, and they're really not that loud. my dunlop mud rovers were louder, and so are my BFG ATs, surprisingly. comparatively, my KM2s are noisy <50mph and quiet at highway speeds, whereas the SSRs are quiet <50mph and whine/howl (only noticeable with windows down) at highway speeds.
i can only speculate what the 35x10.50 actually measures out to, with the weight of your jeep on it. but on my ~4klb nissan, the super stiff sidewalls on these tires allow hardly any sag. Interco says my SSRs measure out to 32.7in, and in fact they currently measure to more than that, despite having worn down some tread and with the weight of my vehicle. Interco is typically pretty good about being very conservative on their tire OD measurements. if anything, they're larger than they advertise.
that's not my FJ Cruiser. i run the SSR in a smaller size, and they're really not that loud. my dunlop mud rovers were louder, and so are my BFG ATs, surprisingly. comparatively, my KM2s are noisy <50mph and quiet at highway speeds, whereas the SSRs are quiet <50mph and whine/howl (only noticeable with windows down) at highway speeds.
i can only speculate what the 35x10.50 actually measures out to, with the weight of your jeep on it. but on my ~4klb nissan, the super stiff sidewalls on these tires allow hardly any sag. Interco says my SSRs measure out to 32.7in, and in fact they currently measure to more than that, despite having worn down some tread and with the weight of my vehicle. Interco is typically pretty good about being very conservative on their tire OD measurements. if anything, they're larger than they advertise.
Hilldweller
SE Expedition Society
Discount Tire gave me a $100 rebate coupon on top of the other discounts. That effectively lowered the price of the BFGs to $166 each plus mounting and tax.
Initial impressions: instant better fuel economy; boy they look skinny...
Redline
Likes to Drive and Ride
Psi
I think the Les Schwab boys were right on with 32 PSI. Not that it will hurt you to run 35, maybe a firmer ride on an already firm/stiff sidewall tire.
At 35-PSI a 255/85R16 is rated to handle 1,920-lb. per tire. Do you have over 3,840-lb. on each axle? I doubt it. At 40-PSI a 255/85 is good for 2,110, at 45-PSI, 2,290-lb.
If you are doing extended high speed driving then you might run them a bit higher, 35-40?, but my everyday PSI on my very heavy 4Runner is 32. With a heavy trailer with lots of tongue weight I will go higher in the rear as needed, but not for everyday.
I think the Les Schwab boys were right on with 32 PSI. Not that it will hurt you to run 35, maybe a firmer ride on an already firm/stiff sidewall tire.
At 35-PSI a 255/85R16 is rated to handle 1,920-lb. per tire. Do you have over 3,840-lb. on each axle? I doubt it. At 40-PSI a 255/85 is good for 2,110, at 45-PSI, 2,290-lb.
If you are doing extended high speed driving then you might run them a bit higher, 35-40?, but my everyday PSI on my very heavy 4Runner is 32. With a heavy trailer with lots of tongue weight I will go higher in the rear as needed, but not for everyday.
Hilldweller
SE Expedition Society
How high?
I'm going to start experimenting with the trailer tomorrow ---- when I travel "heavy" the tongue weight is about 165-170 pounds and a couple of hundred pounds in the back of the Jeep.
Redline
Likes to Drive and Ride
weight check
I would start at 35-PSI. 165-170-lb. is not that much (depending on how much weight is on the rear axle already).
I don't say this often enough (to everyone), pay a few bucks and weight your trucks so you know your gross weight, and front and rear axle weights as you have them loaded.
I would start at 35-PSI. 165-170-lb. is not that much (depending on how much weight is on the rear axle already).
I don't say this often enough (to everyone), pay a few bucks and weight your trucks so you know your gross weight, and front and rear axle weights as you have them loaded.
daverami
Explorer
Thanks for the info. I have been following some of the tire threads, and you do know lots of info on tires. I thank you for your input. I don't have that much weight for sure. I was thinking that with a little more psi, I'd get a little better gas mileage on the highway.
That is good advice to get our trucks weighed. There must be a scale near home here somewhere to do that.
Redline
Likes to Drive and Ride
You're welcome. I have yet to run tests on the impact of running 'super high' or 'excessive' PSI compared to simply 'proper' or 'enough' PSI but I think the difference may be small.
Running too low PSI surely reduces MPG and can cause other problems, but with adequate PSI fuel economy can be better than you might expect. Read the sidebar regarding fuel economy in the 4Runner article in the current Oberland Journal magazine for some similar information.
Running too low PSI surely reduces MPG and can cause other problems, but with adequate PSI fuel economy can be better than you might expect. Read the sidebar regarding fuel economy in the 4Runner article in the current Oberland Journal magazine for some similar information.
daverami
Explorer
Thanks, good info and that 4Runner isn't too shabby either.
jim65wagon
Well-known member
In the Tundra with the Coopers, right now I have 38 psi in the front and 32 in the rear. It generally stays there, unless I need to go to the gravel yard, then the rears get pumped up to about 50.
I tried running 45 all around when gas prices were sky-high, but:
mileage did not improve enough to warrant the much rougher ride. The truck felt skittish on every little bump, the V8 would burn the rear tires if I wasn't careful, and the wear pattern was horrible. Not worth ruining my tires or kidneys.
I tried running 45 all around when gas prices were sky-high, but:
mileage did not improve enough to warrant the much rougher ride. The truck felt skittish on every little bump, the V8 would burn the rear tires if I wasn't careful, and the wear pattern was horrible. Not worth ruining my tires or kidneys.
Hilldweller
SE Expedition Society
I usually use my IR temp gun and shoot the tires after a brisk drive looking for a consistent temp across the tread; that's what they taught us in track school anyhow.
Getting an alignment this morning too.
Getting an alignment this morning too.
daverami
Explorer
That's really interesting. What are the ranges of temps you get?
Hilldweller
SE Expedition Society
I must've put the IR thermometer in my roll-down toolbox behind the trailer... ...couldn't find it yesterday. I'll dig it out today.
The good-natured and well-meaning techs at Discount Tire were going to air the new tires to the max on the sidewall; they gave me a very quizzical look when I asked them to stop at 35.
35 is too much, btw ---- I'm down at 33 right now and I think it's still a little high.
