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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#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?
#4553 of 7006 Michelin digital tire pressure gauge by nyyanks81 Mar 19, 2005 (8:13 pm)
Replying to: alext (Sep 27, 1999 2:54 pm) Does anyone own this gauge? It's from Michelin. What is your opinion on this gauge.? Im thinking of getting a digital gauge and came across the Michelin gauge. How does it compare to the accutire gauge? Replies to this message: steve_ (Mar 19, 2005 8:22 pm)
#4554 of 7006 Re: Michelin digital tire pressure gauge [nyyanks81] by steve_ HOST Mar 19, 2005 (8:22 pm)
Replying to: nyyanks81 (Mar 19, 2005 8:13 pm) See Tire gauges too. Steve, Host
#4555 of 7006 Re: Tire Burst Pressure by imidazol97 by capriracer Mar 20, 2005 (5:31 am)
I saw that post (actually the series of posts), and....ah....well, may be things could have been worded better. (me included!) There isn't a "Minimum Burst Pressure" - like a standard or a regulation. It turns out that if you design a tire correctly, you wind up with static burst pressures well over 100 psi. So it's just a consequence, not an intended result. What is molded on the sidewall is a usage upper end. It is also true that more inflation pressure does increase the risk of impact type failures - a "burst", if you will. But characterizing what is molded on the sidewall as some sort of maximum for "burst" purposes is as wrong as thinking that what people do on the race track has a bearing on what people should do on the street. (Racing is such a peculiar activity from a vehicle operational point of view.) Yes, more inflation pressure does improve steering response (how quick the tire, and therefore the vehicle, reacts to steering input) it also reduces the amount of heat generation and how much a tire "rolls over" on cornering - which is why folks use 40 to 50 psi in FWD cars when racing on "street" tires. I also recommend 3 to 5 psi above the placard inflation - but that's a general rule and not always appropriate - and I do that based on my understand of what methodology is used to set the placard pressures. Part of my recommendation is based on my preference for a "crisper" steering response, but also on the idea that sacrificing a bit of ride softness and getting many improvements (hydroplaning resistance, durability, treadwear,etc) is just a good trade-off. Hope this helps.
#4556 of 7006 In other words, by driftracer Mar 20, 2005 (7:14 am)
disregard what the guy at Pep Boys told you, the tire isn't going to explode at 50 psi based on a 44 psi max load pressure - it'll ride stiff and you'll get center tread wear, but no explosions.
#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.