Tires, tires, tires

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

You are in the Maintenance & Repair Forum. Your Host is mr_shiftright

What is this discussion about? Tires, Wheels, Steering

Edmund's Feature Article: Tire Safety: Don't Ignore the Rubber on the Road

For dedicated winter tires, also have a look at the Snow/ice winter tires discussion topic.

Outline

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#4557 of 7006 capriracer by marsha7 Mar 20, 2005 (5:30 pm)
I am grateful for your explanation, but can you see my dilemma???...a tire dealer (a supposed expert) tells me one thing, and you say another...being a PI lawyer like I am, imagine if one of my tires blew for any reason, I get injured, and I sue for a defective tire...they measure the other 3 tires, see that I put 38 psi in them, and read the max 35 psi on the tire, guess who is at fault???...ME, for overinflating the tires...where will some expert like you be to testify that 35 psi doesn't really mean 35 psi???...I cannot go out right now to view the actual wording, as I am quite ill, but I will post the actual wording molded in a day or so, so you may analyze it and give feedback...it is not that I doubt your word, but can you understand the dilemma???...my Crown Vic has Goodyears that say 44 max psi, and Ford recommends cold 35 psi, so carrying them at 38 psi cold is no problem...further, the one Goodyear tire on the truck, the spare, also says max 35 psi...now TWO manufacturers have 35 psi max for a 35 psi recommended cold pressure from the manufacturer...any tire makes out there with 41 or 44 psi molded in my tire size, so I can carry 38 psi cold in the truck? Replies to this message: imidazol97 (Mar 20, 2005 5:38 pm) driftracer (Mar 20, 2005 5:43 pm) imidazol97 (Mar 20, 2005 5:52 pm) tidester (Mar 20, 2005 6:44 pm)
#4558 of 7006 Re: capriracer [marsha7] by imidazol97 Mar 20, 2005 (5:38 pm)
Replying to: marsha7 (Mar 20, 2005 5:30 pm) Just checked my Michelins. The symmetry tires say rated at a maximum load at 35 psi. maximum pressure. That tells me not to expect them to carry more that that 1709 pounds or whatever it was just by upping the pressure above 35. It doesn't say not to inflate above 35. It says the tires are not capable of higher loads even if I were to inflate higher. The Harmonys say the same for 44 psi as max pressure for rating of load purposes. That might explain why the symmetry tires are softer than the X-ones or Harmonys I've had recently. They are meant to have a luxury car ride.
#4559 of 7006 Re: capriracer [marsha7] by driftracer Mar 20, 2005 (5:43 pm)
Replying to: marsha7 (Mar 20, 2005 5:30 pm) If it helps, and this is NOT a solicitation...I'm an automotive expert witness, and I'll gladly testify that your tire guy doesn't know beans about tires and having a tire at 38 psi didn't cause a tire failure. I'm totally amazed at some of the incredibly uneducated things that come out of the mouths of some shop techs and managers, especially at chain shops like Midas, Meineke, and Pep Boys...pretty danged scary. Both my sons work at Pep Boys in parts, it's a pretty decent job for a high school senior and a college freshman, discounts on stuff, decent pay, but the stories they come home with would curl your hair. Replies to this message: imidazol97 (Mar 20, 2005 5:52 pm)
#4560 of 7006 Re: capriracer [driftracer] by imidazol97 Mar 20, 2005 (5:52 pm)
Replying to: driftracer (Mar 20, 2005 5:43 pm) I have run tires at 3-4 pounds above car recommended pressures for decades. Thirty-five has been my max pressure cold. When the tires are driven the temperature increases which increases the pressure at about 1 pound pressure for each 10 degrees Fahrenheit. So that pressure goes above 35 pounds. However, because of the increased pressure, the tires don't heat as much and and the pressure don't rise as much. If they are lower in pressure to start with, and driven at speeds and with loads such as 4 in the car, the tires heat up more, which adds more pressure which slows the increase in heating due to the additional pressure. My point is starting with the higher pressure isn't going to end up with 3-4 pounds additional at highway speeds and 3 adults and lotsa luggage and ice cooler chest for refreshment on the road because of the reduction in extra heating.
#4561 of 7006 Shoot, I run 45-50 lbs in tires rated by driftracer Mar 20, 2005 (6:02 pm)
at a max of 44 when I autocross, depending on what my tire paint shows me, and that's on vehicles rated at 28-35 psi by the manufacturer. I'd have a serious blast providing testimony for the argument that 3 psi caused problems. Heating tires up enough to have tread chunk off, while at 50 psi, and driving 70-80 mph through corners, and never a failure in 18 years...please.
#4562 of 7006 Re: capriracer [marsha7] by tidester HOST Mar 20, 2005 (6:44 pm)
Replying to: marsha7 (Mar 20, 2005 5:30 pm) but can you see my dilemma??? If you're that concerned then adhere strictly to the written recommendations of the manufacturer. tidester, host
#4563 of 7006 Ziex-512 - poor treadwear? by mbuster25 Mar 20, 2005 (8:47 pm)
Hello Everyone: I own an ES300, oem Michelin MXV4 (not MXV4+), replaced with Ziex-512s. The Ziexs in my size at 205-65R15 are suppose to be warrantied for 60K, but at my rate, I will only see 25-27K down to 2/32. Anyone else getting poor treadwear with Ziex-512 or can recommend a tire better than it? Thank you
#4564 of 7006 Re: Tire Burst Pressure by imidazol97 by capriracer Mar 21, 2005 (4:09 am)
"a tire dealer (a supposed expert)" I think most tire dealers try to be helpful, and will try to answer your question, even if it means "making up" an answer. I don't think you can call them "experts", in much the same way you can't call vehicle dealers "car experts". Each of these have some knowledge and expertise, but there is a limit to their expertise I can only say that I'm a lot closer to the folks who write that stuff on the sidewall. But there is some new information that wasn't in your earlier posts - Do you say you are a Pl lawyer - as in "Product Liability"? If so, then you know about "Daubert" and that ought to clue you in. Hope this helps.
#4565 of 7006 Personal Injury. by driftracer Mar 21, 2005 (4:19 am)

#4566 of 7006 Max Performance Tires by kschac Mar 21, 2005 (9:29 am)
I have a 2004 BMW 545i with sport package - 18 inch BMW wheels. I am looking to replace the rather uncomfortable OEM Dunlop run flats with a set of max performance summer tires. I am deciding between the Goodyear F1 GS-D3 and the Michelin PS2's. Tire sizes are 245/40-18 (front) and 275/35-18 (rear). While high performance is a priority, I would be willing to sacrifice the last degree of performsnce for some enhanced comfort. I live in the NYC area and we have a lot of potholes! Any thoughts or suggestions? Replies to this message: kschac (Mar 27, 2005 7:16 pm) rwoods (Apr 19, 2005 10:28 am)