Tire cracks

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How bad do tire cracks need to be before changing? On the Tacoma i have some good amount of tread left but between the grooves cracks have developed. The tires are Yoko's Geolander RTS's.
 
Wife has Sumitomo's on her Grand AM with cracks between the treads. Any amount of cracking(if there are a lot of cracks) tire should be changed when possible. I haven't had the money due to work issues but its on a priority list to get done before the fall along with new shocks for her.

Almost anytime there is a crack in the groove itself, its at the heart of the tire(basically think of the deep recess as being closer to the steel belted lining, so you don't have as much rubber protection as you would if it were on top of the grooves(upper layer of the tire). Cracked rubber will flake and chip away quicker resulting in a tire wearing out faster.
 
Cracks between the treads or on the sidewall are classic signs of dry rot and they should be replaced.
 
Originally Posted By: Papa Bear
I believe CapriRacer once said that small crazing on the sidewall is acceptable but cracks in the treads are not, they should be changed out.
How old are the tires?

I got them three years ago. Im guessing 30K on them now. It goes to show that southern heat and cold play a roll.
 
Originally Posted By: kart17
Think about what is going to happen to that crack at highway speed. Seems like it would try/want to open up at speed.

Yea. Ive thought of that too. Air pressure has stayed consistant. My spare tire is in worse shape compaired to the other four.
 
Originally Posted By: PhillyJoe
Cracks between the treads or on the sidewall are classic signs of dry rot and they should be replaced.

Are there any cleaners or shines that can be used to keep its natural oils inside the tire?
 
Originally Posted By: Papa Bear
I believe CapriRacer once said that small crazing on the sidewall is acceptable but cracks in the treads are not, they should be changed out.
How old are the tires?


Originally Posted By: Papa Bear
TIRE RACK says "Depending on their severity, they may be cosmetic in nature if they don't extend past the rubber's outer surface, or may be a reason to replace the tire if they reach deep into the rubber."


Yup, to both!
 
Originally Posted By: Papa Bear
TIRE RACK says "Depending on their severity, they may be cosmetic in nature if they don't extend past the rubber's outer surface, or may be a reason to replace the tire if they reach deep into the rubber."

I saw that too. Ill keep an eye on things.
 
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