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Agreed, I think you have too much toe on the rear. However I only get about 8-10k from a set of tires myself so I don't think you're getting killed on costs at least.
I'll disagree with the above about the 3:1 rear to front replacement. I suppose if you're always fishtailing or doing burnouts, it could happen, but I find if you drive aggressively (especially braking hard, trail braking, lots of corner speed, etc) while you will get more wear out of the fronts than the rears, it's not that much more and you don't want tires with vastly different wear front to rear so I just replace them 4 at a time.
Toe settings wear tire faster then high camber angle. Get an alignment and ask for 1deg camber in front, zero toe, 0.5 camber in rear and 0.1 toe out in rear
dealers don’t do realignment at delivery. Too much toe scrubs tire. Like walking pigeon toe down a concrete road, your shoes wouldn’t last long.
Toe out in the rear will make for an interesting ride!
Thank you for all the input so far. As promised here are better pictures of the tire. The original service advisor said it was normal wear and tear, but the service advisor who game me my old tire said I might need to check my alignment. The pictures below are of my rear left tire. The rear right tire looks the same but with maybe 10% less wear (still lots of cord showing).
I caught my rear tire wear on its way to the above wear pattern. I took it in to the local Porsche dealer for an alignment and told them of the wear, obviously caused by too much negative camber.
When I got the car back, they had adjusted the fronts, which were a bit off, and the rears not at all. I had the alignment sheet and called them back, stating that the inside of the rear tires would get eaten up way before the the rest of tread, of which there's quite a bit even after nearly 12k miles.
I got a call back from the lead service advisor, after I had made another appointment to get resolution. He stated that Porsche factory settings, and built into their equipment, puts that negative camber in for better track performance. They will align for a street setting but the setting will show outside the "green" zone.
So, the above pattern will happen with the factory settings. As I'm not a track participant (yet), we'll go with street numbers.
On another note, the new Corvette C8 alignment comes in a "street" default settings, which has been found to cause understeer. When changed to "track", the car handles more neutral, this has been noted by YouTubers that have driven C8s at both settings.
It’s not a camber problem. If tire is straight, camber will result in even wear on 1/3 to 1/2 of tire. A thin edge like this is all due to toe. Dealers are lazy about toe because it takes time. Double check your alignment sheet and talk with advisor to reduce.
and correcting Norge911 above, slight toe inn in rear but only 0.05 to 0.1 deg.
zero toe in front.
I’ve got near 12k on mine and also have RAS. Those look good, even wear. And I keep comfort pressure as well.
Mine are nearly at the carcass on the inside edge and plenty left before the bars on the rest. Would like to resolve the issue before buying a set of rears.
I’ve got near 12k on mine and also have RAS. Those look good, even wear. And I keep comfort pressure as well.
Mine are nearly at the carcass on the inside edge and plenty left before the bars on the rest. Would like to resolve the issue before buying a set of rears.
Three months ago I replaced rear tires at 9,600 miles. The right rear looked like pictures above. The left rear worn on the inside but not as bad. I had a 4-wheel alignment done. The neg. camber before alignment was -2.21 on the right vs -1.56 for the left. The proper spec calls for approx -1.4 on both sides. The toe on both was ~ on spec before alignment. So, NOT a factor.
In my experience, extreme wear of just the shoulder as you guys are showing here is toe wear. I've run -2.5 to -3.0 degrees camber on a number of my cars, FWD, AWD, and RWD and none of them exhibit the type of wear you guys are showing with cord on just the very edge. I will say that this looks extreme even for wear for too much toe. Where the cord is showing doesn't even really look like part of the contact patch. I'm inclined to think of the tire rubbing on something as a possible cause. Possible with the RAS and hard cornering that the tire is deforming enough to rub something?
07-23-2020, 11:37 PM
