Replace a single tire?

[dinfern22]

Hey everyone, hope all is well!

I have 3 HP Primacy tires that have not been used for a while and I wanted to put them back on my car, but I have a bit of an issue.

I initially put away the tires after one tire blew out, and replaced them with PSS, but now those are worn. The HP's have only been used for 1 year and only have ran about 5-10k.

My question is, can I put a single new HP Primacy tire with the rest or will that affect the treading etc. I was thinking about buying a used tire, but now I don't feel safe using a used tire.

Here are the 3 tires...Will they be ok with a single new tire?

[Vital]

It'll work just fine. Id be more worried about those other 3 tires since they might be getting old, i guess it would be alright since you didnt really use them much.

[dinfern22]

Originally Posted by Vital

It'll work just fine. Id be more worried about those other 3 tires since they might be getting old, i guess it would be alright since you didnt really use them much.

Great thanks!

Is that really a cause for concern, what could happen to tires that haven't been used in a while?...Because these 3 tires have been sitting in the backyard shed for around 4 years now.

[Transport3r]

Originally Posted by dinfern22

Great thanks!

Is that really a cause for concern, what could happen to tires that haven't been used in a while?...Because these 3 tires have been sitting in the backyard shed for around 4 years now.

Rule of thumb is that tires lose a significant portion of their grip after ~6 years of being made, and after 10 years they should be replaced regardless of thread wear.

I personally don’t use performance tires at all after they reach 6 years.

Check for the date stamp on them, if they’re older than 2016 I’d toss them.

https://m.tirerack.com/tires/tiretec...e&gclsrc=aw.ds

[KMA KiCKz]

Might want to get a used one with almost the same amount of tread life left, if possible.

If you buy a new tire, you'll be stuck with a single one once it is time to replace the old set but you could keep it as a spare just like your previous incident.

Based on the pictures, them tires still got a good amount of life left on them.

It would depend on how they were stored. Were they garaged or left outside in direct sunlight?

[Transport3r]

Originally Posted by KMA KiCKz

It would depend on how they were stored. Were they garaged or left outside in direct sunlight?

Doesn’t really matter. Exposure to oxygen is what ages the tire compound. Unless they were sealed in vacuum bags, they’re more or less done after 6 years.

[dinfern22]

Originally Posted by Transport3r

Rule of thumb is that tires lose a significant portion of their grip after ~6 years of being made, and after 10 years they should be replaced regardless of thread wear.

I personally don’t use performance tires at all after they reach 6 years.

Check for the date stamp on them, if they’re older than 2016 I’d toss them.

https://m.tirerack.com/tires/tiretec...e&gclsrc=aw.ds

Shoot! Looks like it says 2015. Is there any chance it's safe to use? Money is kind of tight right now...

[dinfern22]

Originally Posted by KMA KiCKz

Might want to get a used one with almost the same amount of tread life left, if possible.

If you buy a new tire, you'll be stuck with a single one once it is time to replace the old set but you could keep it as a spare just like your previous incident.

Based on the pictures, them tires still got a good amount of life left on them.

It would depend on how they were stored. Were they garaged or left outside in direct sunlight?

It was left in the shed in the backyard for about 4 years, so no light. Never touched once they were taken off.

[KMA KiCKz]

Originally Posted by Transport3r

Doesn’t really matter. Exposure to oxygen is what ages the tire compound. Unless they were sealed in vacuum bags, they’re more or less done after 6 years.

I forgot about how oxygen could be a factor, thanks for mentioning it.

Originally Posted by dinfern22

It was left in the shed in the backyard for about 4 years, so no light. Never touched once they were taken off.

It might be best to play it safe. Better to spend money on new rubber than to be in an accident due to old tires.

[CrowsFeast]

I don't see any signs of dry rot so I'd say you'll be ok. The tires don't look too worn either so the one new tire shouldn't have that much of a difference in circumference (which I think is where the recommendation to always change at least 2 tires at a time comes from). That said; I'm just some guy on the internet.

[Transport3r]

Most sources will tell you 10 years is the maximum you should be running, I’ve noticed that tires between 6 and 10 years old are more unpredictable then before. I wouldn’t say 2015 tires are unsafe, just realize they may behave differently at the limit and the limits will be lower. Better than running a set of $60 tires that’s for sure.

[Transport3r]

Oh, and put the new tire on the front, just in case there is a small difference in rolling diameter between the old tires and new tires, your LSD won’t have to deal with it.

[beltax90]

Originally Posted by Transport3r

Doesn’t really matter. Exposure to oxygen is what ages the tire compound. Unless they were sealed in vacuum bags, they’re more or less done after 6 years.

@ 5:01

[Transport3r]

Originally Posted by beltax90

@ 5:01

Yea sunlight and heat will quicken the process too, and dry the tire out. Modern tires are pretty resistant to that though, they have a molded-in dressing/conditioner that ‘sweats’ out of the tire over time and protects the surface of the rubber. That compound sweating out is what makes tires look brown after a while.