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-   -   Tread depth (http://legacygt.com/forums/showthread.php?t=199901)

computersoc 01-17-2013 06:43 PM

Tread depth
 
After almost 21k miles, I have 7/32 to 7.5/32 on each tire. I think one is a little above 7/32, two are around 7.25/32 and the other is a little under 7.5/32, is that ok for wear since they're all different?

Is being around 7/32 normal or good after appx. 21k miles? My driving is mostly highway.

How many 32nds can I run them down to until they need to be replaced? I think law in my state is 2/32, but I'm not sure what traction, handling, or feel will be like at that. My guess is that is too low?

BAC5.2 01-17-2013 07:25 PM

Tires have wear bars. They will tell you when they need to be replaced.

You should be rotating your tires every (or every other) oil change. You also need to measure depth across the tread to ensure they wear evenly.

computersoc 01-17-2013 09:33 PM

I've been doing 8k tire rotations. Should I switch it?

Is that a good tread depth to be at right now? Or are they wearing too fast?

RabidWombat 01-17-2013 11:31 PM

8k is fine. He's referring to the 2009 OCI which is 3750mi.

Your tire wear sounds reasonable. Assuming the tread started at about 10/32nd (typical), you've used about 1/3-1/2 to a wear bar at 2/32nd. I'd say your well on pace to exceed 50k miles, which is standard for OEM tires.

Your tires will see the snow and rain performance degrade as they wear. Depending on how bad conditions you drive in, you may want to replace at about 2x the wear bars. Since you're in upstate NY, you might want to consider dedicated winter tires anyway.

apexi 01-18-2013 01:34 AM

Being down to around 7/32nd's after 21k is pretty good in my opinion. Personally I replace my tires at around 4/32. Here's tireracks take on the subject. While they may seem like a biased source, i agree with their thoughts on the subject.

http://www.tirerack.com/tires/tirete...jsp?techid=157

mark5032 01-18-2013 05:57 AM

If you have the Turanzas on your car, I would replace them at 4/32".

Norm Peterson 01-18-2013 07:02 AM

Quote:

Originally Posted by computersoc (Post 4251177)
After almost 21k miles, I have 7/32 to 7.5/32 on each tire. I think one is a little above 7/32, two are around 7.25/32 and the other is a little under 7.5/32, is that ok for wear since they're all different?

They're all within 0.02", which is about as good as you can expect unless you go out of your way to find tire pressures and alignment specs that work best for you in your specific driving.

Measure at least three positions across the tread (inside, mid, outside) and see how close to even they are.


Quote:

Is being around 7/32 normal or good after appx. 21k miles? My driving is mostly highway.
Exactly what tires do you have? Not only do various tires have vastly different treadwear ratings, there is also at least 2/32 variation in the tread depth that they start out with. IOW, I can't tell if you've worn only 2 or 3/32nds off them (about 35% worn from a 10/32 tire) or if it's been closer to 5/32 that's already gone (50% worn from 12/32). Estimates based on keeping them down to 2/32".

50% worn @ 21000 miles sounds about right for 350 - 400 treadwear tires.


Quote:

How many 32nds can I run them down to until they need to be replaced? I think law in my state is 2/32, but I'm not sure what traction, handling, or feel will be like at that. My guess is that is too low?
For upstate NY, I'd have put on a set of dedicated winter tires and not be concerned yet.

For "3-season" purposes, if you've got some reasonably current wet autocross experience under your belt you probably can go all the way to the wear bars (2/32). If not, start your tire-shopping once you drop below 5/32 so you'll be able to make your tire decision at leisure instead of in haste under time pressure.


Norm

Captain Ned 01-18-2013 08:23 AM

Upstate NY means 2 sets of tires (Vermonter here). OE tires with half-tread are a Bad Thing when the snow flies.

As for snows, I stick to the Finns (Hakkapellitta).

computersoc 01-18-2013 11:30 AM

I have Bridestone on it now I think. Two sets doesn't seem necessary since it's been doing fine in what little snow we've had.


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