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Had the same issue on my TTS. Same inside wear on a new set of Michelin 4S. Camber was off slightly. Did not expect this much wear with so little adjustment.
Lex is right. Have to check tires often to catch unusual wear patterns.
what? Just about everybody who tracks stockish cars wears the outer edge of the tire before the inner.
On a 911? 20 years ago, first 911. Maybe 15,000 miles. Doing my own oil change. Shocked to see a cord popping through. many cars later, I've learned it is just how they wear. I still can't believe he got 33k out of a pair of rear tires. Must have been a lot of highway miles.
what? Just about everybody who tracks stockish cars wears the outer edge of the tire before the inner.
A car with negative rear camber is often the ideal setup for best handling performance, and it tends to be the way new cars are often setup.
But it does wear the inside rear tire more. If folks run almost neutral camber, driven on the street, the rear tire will wear pretty evenly across the inside to the outside.
I’m not sure why folks are suggesting toe. I would have thought this one is pretty obviously camber?
The pattern of wear indicates toe out is primarily to blame. Too much negative caber would leave the outside tread blocks with a lot more rubber while the inner blocks would be worn more. Instead, the photos show the tires did wear fairly evenly across all tread blocks except for the very inside edge where the rubber is ground off and cord is exposed.
Yeah Lex- I did think I got a lot of miles outta them. Just shudder at how dangerous it was and how stupid of me not to check more closely. I got lucky here.
A car with negative rear camber is often the ideal setup for best handling performance, and it tends to be the way new cars are often setup.
But it does wear the inside rear tire more. If folks run almost neutral camber, driven on the street, the rear tire will wear pretty evenly across the inside to the outside.
I’m not sure why folks are suggesting toe. I would have thought this one is pretty obviously camber?
Firstly, im pretty well aware of what negative camber is and have many examples of stockish cars wearing the outside edge of their tires far worse than the inner if they are driving with any kind of speed.
Now, while camber can lead to increased wear, with toe you are essentially scrubbing the tire at all times, leading to this sort of wear pattern.
At every oil change (about the 5,000 mile mark) I data log each tire's tread depth on the back of the oil change receipt. I take 3 distinct (one reading for each of the 3 major groves) measurements for each tire, and write it down.
If you are really-really observant, you'll start to notice a repetitive "blister" pattern in the black rubber of the tire just before cording. Hard to see, but it's there. Also, on aggressive corner exit, you'll notice a bit more tire slip before they hook-up. Can be fun.
Yeah Lex- I did think I got a lot of miles outta them. Just shudder at how dangerous it was and how stupid of me not to check more closely. I got lucky here.
I wouldn't be too hard on yourself. It can be difficult to see the inside edge of a modern 911's rear tires thanks to its low ride height, long/low rear overhang, and how far the inside edge of a 295 or 305 is tucked under the car—and a good-looking "most of the visible tread" can instill false (but entirely understandable) confidence right up until the cords come out. I suspect many enthusiasts who are otherwise attentive to their cars have been surprised to spot some cording on a tire at one time or another. I know I have.
So you learned a lesson, and better yet shared it with others who will hopefully heed it or use it as a reminder (as I will).
On the tire sidewall, there are visual triangle markers (sometimes even little Michelin man logos) molded in all around the circumference. These markers denote where the tread depth indicators are. Then you can easily reach in, and feel what is left on the inner 1/4-1/3 of the tire.
33,000 miles, holy crap. That's insane, I don't even understand how you can get close to that. My first pair lasted 6k and that was with no track days, I got an alignment done and got 10k out of my last pair which i was happy with.
02-03-2020, 09:14 AM
