flipflop
Ok to Drive
attitude is everything
Posts: 178
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Post by flipflop on Oct 22, 2009 21:56:17 GMT -8
Trail ready toyota with me in it = 3800lbs.
Tires = 35x12.5x15 radial mud terrain tires are 1 year old Wheels = 15x10 steel wheels Street Pressure = 17psi front/10psi rear Trail Pressure = 7psi front/5psi rear
Reason I ask is I was hoping the sidewall on these radial mud terrains would break in abit more so I wouldn't have to run 17/10psi on the street. But for some reason that's not the case even after a year of heavy snow use aired down to 5/4psi in the snow. My street pressure's on these tires seem real low in order to get a full contact patch across the entire width of the tread. I'd like to run these tires at 25/20psi but then the tires would only really ride on the two center lugs/tread. I guess I'm curious if anyone else has this problem?
flip.flop
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Post by trdoffrd on Oct 23, 2009 0:07:57 GMT -8
running 15/10 here for the street an any were from 5 on down on the trail. this is with a 36 radial irok
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Post by toyrocs on Oct 23, 2009 8:25:44 GMT -8
Trail ready toyota with me in it = 3800lbs. Remember your running high flotation tires on a very light truck .Your pressures will have to be lower than expected. How is the wear pattern on the tread? This is a good way to determine proper pressures. Another consideration is how does the truck handle? Does it under-steer/ over-steer excessively? Does it have excessive tire squirm when turning? Does the tire side-wall tuck under? This is noted by wear or scuffing on the side-wall of the tire. Toyrocs
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flipflop
Ok to Drive
attitude is everything
Posts: 178
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Post by flipflop on Oct 23, 2009 9:27:51 GMT -8
running 15/10 here for the street an any were from 5 on down on the trail. this is with a 36 radial irok O.K., well thats some what reassuring, at least I'm not the only Toy. having to run this low of psi on the street. Thanks for posting. flip.flop
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flipflop
Ok to Drive
attitude is everything
Posts: 178
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Post by flipflop on Oct 23, 2009 10:02:34 GMT -8
Remember your running high flotation tires on a very light truck .Your pressures will have to be lower than expected. How is the wear pattern on the tread? This is a good way to determine proper pressures. Another consideration is how does the truck handle? Does it under-steer/ over-steer excessively? Does it have excessive tire squirm when turning? Does the tire side-wall tuck under? This is noted by wear or scuffing on the side-wall of the tire. Toyrocs Does a 35x12.5x15 really count as a high flotation tire? Wear pattern is as expected center tread slightly worn more than outter treads but overall still looks brand new. Truck wanders on freeway, lots-o-body role, but other than that great!! Nah, nothing is to excessive its just annoying me as a daily driver, gues I could park this toyota and get a real daily driver, what ever that is...? Toyrocs these are all good questions and I think that I'd probably be having more issues if I would have left these tires on the 15x8" steel wheels that they were first mounted to. At the time I thought if I went to a 10" wide wheel that I wouldn't have to air the tires as far down, but it really didn't change my street PSI. I can imagine excessive tire role, squirm, under/over steer running a 8" wide wheel though.
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flipflop
Ok to Drive
attitude is everything
Posts: 178
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Post by flipflop on Oct 23, 2009 10:14:16 GMT -8
So isn't there a difference between a Radial and Bias Ply tire? Shouldn't the sidewalls become fatigued overtime and soften up a bit? I wonder if this tire pressure vs. weight of vehicle is linear or does the sidewall height and load rating of the tire make more of a difference? 38x12.5x15" swamper on a 15x10" wheel in my mind it seems like you wouuldn't have to air that tire down as far on the street to get an even contact patch on the street?
Or maybe I'm over thinking this and I need to run a smaller tire say a 33x9.5" would probably do the trick. Only problem is I would have to run a different camshaft...stage 2 or 3 maybe?
...Sounds like I don't know squat about tires, I'm switching to decaf and going to go talk with Les Schwab guys, hopefully get an education on tires/wheels.
flip.flop
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Post by trdoffrd on Oct 23, 2009 11:35:41 GMT -8
i notice a big dif in sidewall flex after i groove my tires. just keep in mind the Toys are lite, mine show very little sidewall flex an they are 3 1/2 yrs old an have been daily drivers.
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Post by trdoffrd on Oct 23, 2009 11:37:30 GMT -8
an Les Schwab will tell you to run 32 psi don't go asking them!
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Post by Jon on Oct 23, 2009 13:52:19 GMT -8
Whoa now!! Take it easy there. No reason to do anything rash here.... ;D
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Post by iceman on Oct 23, 2009 18:25:26 GMT -8
My nissan (3200 lbs with me and gear) I ran 31-10.50-15 radial that was a aggressive a/t (if there is such a thing) and I couldn't run them with more than 20psi on the street or the truck would push in the corners and the center of the tire would wear baddly. And offroad I would run 8 to 10 in the dirt and 4 to 8 in the snow this is with a 8" rim. But for an A/T they hooked up really well.
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flipflop
Ok to Drive
attitude is everything
Posts: 178
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Post by flipflop on Oct 23, 2009 18:54:34 GMT -8
an Les Schwab will tell you to run 32 psi don't go asking them! Yah you were right, that's pretty much what they told me initially, then I explained the situation more and found out that we had the same understanding and knowledge on tire pressure topic Oh well, I needed to test my new fancy cross member bushing. flip.flop
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flipflop
Ok to Drive
attitude is everything
Posts: 178
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Post by flipflop on Oct 23, 2009 18:59:50 GMT -8
My nissan (3200 lbs with me and gear) I ran 31-10.50-15 radial that was a aggressive a/t (if there is such a thing) and I couldn't run them with more than 20psi on the street or the truck would push in the corners and the center of the tire would wear baddly. And offroad I would run 8 to 10 in the dirt and 4 to 8 in the snow this is with a 8" rim. But for an A/T they hooked up really well. That really suprises me but its good to know, maybe I won't be able to just bolt on a set of skinny 33" tires and run them on the street at 20+ psi. Then again maybe my expectations are way to high from driving/wheeling my heavy fj40 all of these years, and the light toy. pickups are really just that much lighter...? flip.flop
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Post by fivendime on Oct 23, 2009 23:25:58 GMT -8
On my Cherokee I run 33" BFG Baja TA's which are normally at 40- 45 PSI on the street. Sounds like allot but that's where they wear the best. I have aired these down to 10lbs in the snow and it seems like that's no where near enough. I realize they are Baja tires and not engineered for the snow. The nature of the tires is another story as well. They are crud for wet or snow traction......simply put my 2wd Ford ranger does better in the snow with studs then my Cherokee with 4wd aired down, and that makes me mad...haha
On my CJ3B I have 32" TSL's and I run them around 30 PSI on the street. I have never run less then 8lbs. Much less then that and they feel like there going to come off. I think age has something to do with these tires though cause they are old. Of course with a rig that weight probably around 3K with no air they bulge very little.
Thats just what I run.
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