Tires, tires, tires

7006 messages, Last post on Oct 29, 2009 at 11:24 AM

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#4543 of 7006 I was just informed today by a tire by marsha7 Mar 12, 2005 (2:49 pm)
dealer, NTB, about my problem, but their answer doesn't make me feel any better...on my new Dodge Ram, the tires, Michelin LTX A/S P245/70R17, have the maximum pressure molded into the tire (like they all do) and the max pressure is 35 psi...the laebl on my truck says that Dodge recommends that the air pressure in the tire should be 35 psi cold...the tire guy just told me that the "P" at the beginning of my tire size does not mean "passenger" but the P means a shorthand that says that it is a 35 psi tire...why would Dodge recommend a tire that their safe minimum recommended pressure coincides with the tire's maximum safe pressure???...I usually keep my tires 1-2 psi OVER the minimum rec pressure, to allow for 1-2 psi leakage and still be safe...someone on these boards a few months ago said something about 2 different standards of psi and the way they measure it, but the tire dealer said that was bunk, 35 psi means 35 psi...does this not seem like the tire is not properly made for this truck, since Dodge certainly knows how they designed their truck and to what psi they recommend on the tires it rides on...yes, these tires were on factory wheels...what gives??? Replies to this message: corvette (Mar 12, 2005 3:16 pm)
#4544 of 7006 Re: I was just informed today by a tire [marsha7] by corvette Mar 12, 2005 (3:16 pm)
Replying to: marsha7 (Mar 12, 2005 2:49 pm) P does indeed mean it's a passenger car tire, LT would indicate it's a light truck tire. Can't help with the rest.
#4545 of 7006 Re: I was just informed today by a tire..... by marsha7 by capriracer Mar 13, 2005 (4:16 am)
And you were informed wrong, Marsha. (BTW, welcome to my world!!) Just a bit of clarification. The "P" only sort of stands for "passenger". It's on a truck, right? That means there is more to than that. The tire dealer was sort of right when he said that the "P" means 35 psi. That's true for Standard Load tires, but there are Extra Load tires, too, and those are 41 psi. However, the dealer is totally wrong if he thinks that 35 psi means 35 psi is the absolute maximum pressure. You see, the folks that make tire standards say that the load curve for P metric standard load tires ends at 35 psi and that's where the maximum load carrying capacity occurs. But the standards folks also say it is permissible (and they even hint at desirable) to use higher inflation pressures for certain circumstances. Those circumstances are generally higher speeds as experienced in Europe, but I think they are applicable any time someone exceeds 80 mph or the ambient temperature exceeds 100F. Those other "maximum's" are 44 psi and 51 psi for both P metric and Euro metric tires (without the "P".) LT metric tires are a whole different kettle of fish and in some respects have this same problem. For some reason Michelin seems to be the only tire manufacturer that doesn't put this higher inflation pressure on the sidewall, even though the standards say it is permitted. I can somewhat see that if the load curve ends at 35 psi, then putting 44 psi on the sidewall confuses people into thinking that the load curve ends at 44 psi (I can't tell you how many discussions I've had on that subject!!) On the other hand, there is your question. BTW, P metric tires have a static burst pressure over 100 psi. Now don't be thinking you can actually use 100 psi (or even 50!), but the point is that 44 psi is certainly well within the "safe" zone. I just wonder.......How does Michelin write this on the sidewall? If they say "Maximum XXXX pounds at 35 psi", then they aren't saying 35 psi is the maximum inflation pressure.......and all is right with the world! Hope this helps. Replies to this message: imidazol97 (Mar 19, 2005 10:07 am)
#4546 of 7006 Re: TDI shoes [corvette] by ruking1 Mar 13, 2005 (8:03 am)
Replying to: corvette (Mar 12, 2005 1:03 pm) The problem is there are no defined standards, such as; utoq 400, traction AA, temp A. So direct or indirect comparisons can be made but it would be hard to say they are valid. However the fact that it is an OEM product with back up marketing hype is (unfortunately) the surest sign. The reason why is pretty simple. One real world measure is they want to be able to get the highest fuel mileage to publish with a straight face. Or more importantly not to get sued!! ") (:. So it behooves them to put in the LEAST rolling resistant tires as possible!! So for example on a VW Jetta TDI three "lower resistant" tires come oem. In rank order by poll of actual owners in the real world 1. Michelin MXV4 plus 2 Continental ContiContact Touring CH95 3 Goodyear Eagle LS-H. Replies to this message: corvette (Mar 13, 2005 9:41 am) ruking1 (Mar 17, 2005 12:28 pm) mkhphillips (Mar 19, 2005 9:47 am) and 1 more...
#4547 of 7006 Re: TDI shoes [ruking1] by corvette Mar 13, 2005 (9:41 am)
Replying to: ruking1 (Mar 13, 2005 8:03 am) Thanks... Looks like he will probably go with the Michelins again. Replies to this message: ruking1 (Mar 17, 2005 12:28 pm) mkhphillips (Mar 19, 2005 9:47 am) steve_ (Mar 19, 2005 9:48 am)
#4548 of 7006 BF Goodrich Precept or Goodyear Allegra by vs4 Mar 15, 2005 (1:10 pm)
Hello All, I am in the market for new set of tires for my car and have narrowed it down to BF Goodrich precept and Goodyear Allegra tires, both of them are available in Canada through Canadian Tire. I am confused on which one to buy, I am having tough time to figure out which one is more quieter and has better traction than the other one. I asked the service advisor at Canadian tire and he is saying Goodyear (reason they sell more of those and the tread pattern). I also did a quick search at Edmunds and found GoodYear Allegra tire referred in discussion forums a lot more than BF Goodrich Precept. I would like to know if anybody has Goodyear Allegra or BF Goodrich Precept tires on there car and what there experience has been like? Also from anybody else who has heard any good or bad things about these two tires? Thanks for all of your help.
#4549 of 7006 Re: TDI shoes [corvette] by ruking1 Mar 17, 2005 (12:28 pm)
Replying to: corvette (Mar 13, 2005 9:41 am) Best of luck!! Also just as another poster has said the Michelin MXV4's has a few models. I hope he got the correct one for his needs. Replies to this message: mkhphillips (Mar 19, 2005 9:47 am) steve_ (Mar 19, 2005 9:48 am)
#4550 of 7006 RARE Japanese wheels. PLEASE HELP!!! by mkhphillips Mar 19, 2005 (9:47 am)
Replying to: ruking1 (Mar 17, 2005 12:28 pm) I desperately need help on finding these wheels. They are called "Supersonic" and they are made in Japan (I think). I am having a very hard time finding anyone who sells them. I was told that they were introduced to the US about 7 months ago. The only company that I can find them through is QRS Auto Group, Inc. (www.wheeltechnology.com/product-supersonic.php). The middle man is selling them on eBay. I tried to purchase them through him but he said that the company was not responding. The company came to him at last year's SEMA show in Las Vegas. Like I said before, I am in desperate need of these wheels (20") for my Avalanche (Z71). Any help would be greatly appreciated. I can be contacted at “MikeMikeandKaren.cc”. Thanks, Mike Replies to this message: steve_ (Mar 19, 2005 9:48 am)
#4551 of 7006 Re: RARE Japanese wheels. PLEASE HELP!!! [mkhphillips] by steve_ HOST Mar 19, 2005 (9:48 am)
Replying to: mkhphillips (Mar 19, 2005 9:47 am) Try sema.org. Steve, Host
#4552 of 7006 Re: I was just informed today by a tire..... by marsha7 [capriracer] by imidazol97 Mar 19, 2005 (10:07 am)
Replying to: capriracer (Mar 13, 2005 4:16 am) Capriracer: I was critized in another forum when I repeated your statement in this forum about 100 psi for burst pressure minimum. I had responded to a post that 44 psi was a burst pressure and that tires should not be inflated more than 1 or 2 pounds above the maker recommended pressure. The same post said the tires had to have a rounded sidewall or "otherwise the sidewalls will not flex enough to provide proper handling, ride control, etc." But I've always felt handling was better with 3 or 5 pounds more in the tires, especially fronts on FWD. Is that right or is control better with lower pressures? I've had a variety of cars with FWD, Century, LeSabre. But I even felt that true with RWD Mustang and Torino 73. How about that pressure above doorpost?