I just replaced my Kuhmo tires with Potenza 50A's. All tires wore out on the inside where the side wall meets the tire down to belt. The rest of the tire looked great. Balanced, aligned and rotated every 7000. The tire store tells it is the camber set up that can not be changed. Can I affect this camber my raising or lowering tire pressure? Currently using 34 psi.
Not running the M45 2004 agressively.
Thanks
Tire wear
Re: Tire wear (Scavell)
I just had the same issue on mine. The inside of the rears were wearing down to the belts but the rest of the tire looked fine. New tires and an alignment and the shop said all is in spec now and I should not have any more problems. I hope this is the case. I only have about 400 miles on the new tires so I really can't tell anything now.
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AlbuquerqueM45sport
- Posts: 23
- Joined: Tue Dec 16, 2008 1:29 am
- Car: 2006 Infiniti M45 Sport, 1998 Porsche Boxster, 2002 Ford Excursion (7.2L Diesel)
Re: Tire wear (ronez82)
These cars have negative camber in their specs. Well at least that’s what my alignment shop told me. Negative camber is one of the features that allow these cars to handle as well as they do, it is also what contributes to the “twitchy” feeling that many complain about.
As the vehicle turns the outside tire will try and lean out. When this happens the sidewall flexes and the tire will roll over, (outward). To overcome that, the vehicle is set up with the top of the tire leaning in that will basically cause the tire to stand straight up on a corner. A good alignment shop can get some of this negative camber out but not all.
As a matter of fact if you drive aggressively more often than not, you might want to add additional camber. Sport cars with soft tires (sticky) wear out faster but provide that safe feel in fast corner. The negative of that is they are expensive and wear out faster.
Read the tread wear rating on the side of the tires you are thinking of purchasing and purchase the highest number for longest wear and the lowest number for best handling.
As the vehicle turns the outside tire will try and lean out. When this happens the sidewall flexes and the tire will roll over, (outward). To overcome that, the vehicle is set up with the top of the tire leaning in that will basically cause the tire to stand straight up on a corner. A good alignment shop can get some of this negative camber out but not all.
As a matter of fact if you drive aggressively more often than not, you might want to add additional camber. Sport cars with soft tires (sticky) wear out faster but provide that safe feel in fast corner. The negative of that is they are expensive and wear out faster.
Read the tread wear rating on the side of the tires you are thinking of purchasing and purchase the highest number for longest wear and the lowest number for best handling.
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: Tire wear (AlbuquerqueM45sport)
Treadwear rating is extrapolated from a 7200 mile test loop in San Angelo Texas. Tire manufacturers have learned to fudge the test so meaningless to near accurate depending on ethics of manufacturer.
Real performance tires are done by ~~ 20,000 miles.
The tires are tested with a max of -0.5 degrees front camber so anymore will accelerate wear.
Tires are not often tested on exact vehicle as tire companies contract a FLEET so any variance in vehicle weight can shift wear rates.
Increasing load index above oem will increase tire life, decreasing load index will decrease tire life. Roughly by a 60% of gain factor for Michelin of course depending on inflation thruout life.
Important to study tires as they will be used for entire driving life and most people will buy 20-25 sets.
http://www.tiresociety.org/pdf...b.pdf
"Warnings about tire aging hazards arenecessary because the visual cues of the hazard can beinvisible and unknown, therefore it should be considereda "hidden” hazard.Without knowing exactly how much informationthe public has been exposed to about tire aging, therehave been recent efforts to begin to understandconsumer’s perceptions about the hazards of tire aging.A study by Kalsher, Wogalter, Lim and Laughery (2005)suggested that a substantial percentage (26%) of peoplethought that tires could last 10 years or more. Thisindicates at the very least, some incomplete consumerknowledge about tire aging.
"Approximately half (44.9%) of the participantsreported that they have not read the owner’s manual forthe vehicle they drive. Of those who reported readingthe owner’s manual, 63.7% reported that they have readless than 50% of the manual."
http://www.hfes.org/Web/HFESNews/tireaging.pdf
Real performance tires are done by ~~ 20,000 miles.
The tires are tested with a max of -0.5 degrees front camber so anymore will accelerate wear.
Tires are not often tested on exact vehicle as tire companies contract a FLEET so any variance in vehicle weight can shift wear rates.
Increasing load index above oem will increase tire life, decreasing load index will decrease tire life. Roughly by a 60% of gain factor for Michelin of course depending on inflation thruout life.
Important to study tires as they will be used for entire driving life and most people will buy 20-25 sets.
http://www.tiresociety.org/pdf...b.pdf
"Warnings about tire aging hazards arenecessary because the visual cues of the hazard can beinvisible and unknown, therefore it should be considereda "hidden” hazard.Without knowing exactly how much informationthe public has been exposed to about tire aging, therehave been recent efforts to begin to understandconsumer’s perceptions about the hazards of tire aging.A study by Kalsher, Wogalter, Lim and Laughery (2005)suggested that a substantial percentage (26%) of peoplethought that tires could last 10 years or more. Thisindicates at the very least, some incomplete consumerknowledge about tire aging.
"Approximately half (44.9%) of the participantsreported that they have not read the owner’s manual forthe vehicle they drive. Of those who reported readingthe owner’s manual, 63.7% reported that they have readless than 50% of the manual."
http://www.hfes.org/Web/HFESNews/tireaging.pdf
Re: Tire wear (Q45tech)
So is the camber adjustable on our M's?
J
J
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AlbuquerqueM45sport
- Posts: 23
- Joined: Tue Dec 16, 2008 1:29 am
- Car: 2006 Infiniti M45 Sport, 1998 Porsche Boxster, 2002 Ford Excursion (7.2L Diesel)
Re: Tire wear (M4T5)
As far as I know there is adjustment for camber, I don’t know if you can reduce it much, but I know my alignment shop was able to add some in. I would try and find the best alignment shop in your town. You could ask on this website, or go to the local Porsche club website. Porsche drivers are often playing with the alignment on their vehicles to get the best of performance and tire wear. A lot of Porsches eat the rear tires in less than 12,000 miles!