[Bandit009]

Hit a pothole. Tire damaged. Question- what would you recommend? I have 7,500 miles on tires. Replace just fronts? All four? Can I leave the front tire alone for now?

[Mcssls]

Looks like it’s just the bead protector. I’d leave it but if you start noticing a shake or deformity then get the fronts replaced

[Bandit009]

Originally Posted by Mcssls

Looks like it’s just the bead protector. I’d leave it but if you start noticing a shake or deformity then get the fronts replaced

Thanks!

[redcars]

Put some rubber cement from those tire patch kits into the crack before it spreads.

[RockCrusher]

I'd replace the tire just to be safe.

Unfortunately with 7500 miles on the tire you might (might...) have to replace the other tire. General rule of thumb is tires on the same axle should not have tread depth difference of 30% or more.

Encountered this first with my Porsche cars then later with my Hellcat and even my MINI JCW. (Hit a pothole with the right front tire and next AM tire was "flat" due to sidewall damage. Run flat tires are really sensitive to side wall damage.)

[Pentland]

Originally Posted by RockCrusher

General rule of thumb is tires on the same axle should not have tread depth difference of 30% or more.

That’s not correct.

[Prince Thundernight]

[FunnyUsername]

The tire is probably ok to drive on but it could develop a bubble at any time, which means you constantly need to be checking and avoid long drives. Tire bubble means the integrity is compromised and could blowout at any moment. Obviously quite unsafe for even main surface streets driving.
I personally just used the pothole as an excuse to upgrade to PS4s on each wheel. Unfortunately no buyers yet for the other 3 tires despite the low miles and good tread.

[RockCrusher]

Originally Posted by Pentland

That’s not correct.

That's what Porsche stated in its factory manuals.

And while I could find nothing specific in my M2 or 230xi owners manuals I did find the following:

Replacement of wheels and tyres
Fitting and balancing

Have the wheel fitted and balanced by a Service Partner of the manufacturer or another qualified Service Partner or a specialist work- shop.


And:

The following are recommended and approved by the manufacturer of the vehicle for the approved wheels and tyres per vehicle type and special equipment:
▷ Wheel and tyre combinations.
▷ Rim designs.
▷ Tyre sizes.
▷ Tyre makes.
Information on the approved wheels and tyres for the vehicle, as well as the special equip- ment, can be obtained from a Service Partner of the manufacturer, another qualified Service Partner or a specialist workshop.

When I got a puncture in my 2024 230xi's rear tire at the dealer had the tire replaced. Talked with the service advisor and he said the tire wear would be checked by the tech to determine if the other tire on the axle should be replaced. I don't recall any tire wear numbers offered but the word from the tech was tire wear was not enough to require the other tire be replaced. Was not surprised the other tire didn't require replacing as I had put <3300 miles on the car from new and tire wear was minimal.

For the OP he is free to check in with the dealer/service department regarding the question of tire replacement required due to tread depth.

[Pentland]

Originally Posted by RockCrusher

That's what Porsche stated in its factory manuals.

I’m sure this is a BMW forum…..

Originally Posted by RockCrusher

And while I could find nothing specific in my M2 or 230xi owners manuals I did find the following:

Replacement of wheels and tyres
Fitting and balancing

Have the wheel fitted and balanced by a Service Partner of the manufacturer or another qualified Service Partner or a specialist work- shop.


And:

The following are recommended and approved by the manufacturer of the vehicle for the approved wheels and tyres per vehicle type and special equipment:
▷ Wheel and tyre combinations.
▷ Rim designs.
▷ Tyre sizes.
▷ Tyre makes.
Information on the approved wheels and tyres for the vehicle, as well as the special equip- ment, can be obtained from a Service Partner of the manufacturer, another qualified Service Partner or a specialist workshop.

When I got a puncture in my 2024 230xi's rear tire at the dealer had the tire replaced. Talked with the service advisor and he said the tire wear would be checked by the tech to determine if the other tire on the axle should be replaced. I don't recall any tire wear numbers offered but the word from the tech was tire wear was not enough to require the other tire be replaced. Was not surprised the other tire didn't require replacing as I had put <3300 miles on the car from new and tire wear was minimal.

For the OP he is free to check in with the dealer/service department regarding the question of tire replacement required due to tread depth.

As you’d expect from an Owners Manual.


The answer is specified in the BMW TIS.
Easily searchable on these forums so I’ll not repost.

[RockCrusher]

Originally Posted by Pentland

I’m sure this is a BMW forum…..





As you’d expect from an Owners Manual.


The answer is specified in the BMW TIS.
Easily searchable on these forums so I’ll not repost.

Yes, I know this is a BMW forum. Too much to expect I guess for BMW to have to same guidelines regarding tread depth between a new tire and an old (used) tire as Porsche.

I looked in the owners manual and what I found I posted. Which pretty much directs one to check with the dealer.

I tried to find a TIS here or elsewhere but ended up on a Russian site. No TIS but I met a nice Russian lady online. Very pretty. Says she likes me. Asking for air fare to come visit me.

[Pentland]

Originally Posted by RockCrusher

Yes, I know this is a BMW forum. Too much to expect I guess for BMW to have to same guidelines regarding tread depth between a new tire and an old (used) tire as Porsche.

I looked in the owners manual and what I found I posted. Which pretty much directs one to check with the dealer.

I tried to find a TIS here or elsewhere but ended up on a Russian site. No TIS but I met a nice Russian lady online. Very pretty. Says she likes me. Asking for air fare to come visit me.

May be she’s attracted by the Porsche which you mention in every post that she’s attracted to?

Anyway. The TIS has been published and tread depth has been discussed several times on here so you don’t need to search too far.

[Stick435]

I believe it's 2-3mm difference.

https://f30.bimmerpost.com/forums/sh...5&postcount=37

[RockCrusher]

Originally Posted by Pentland

May be she’s attracted by the Porsche which you mention in every post that she’s attracted to?

Anyway. The TIS has been published and tread depth has been discussed several times on here so you don’t need to search too far.

Found some vague/questionable links to "get" the TIS. Some sites offered the info for a subscription. Not willing to share my credit card info with these sites...

More searching and the mentions of TIS were of "versions" at least over a year old.

This highlights a problem. If a car owner obtains some info while it is hoped it applies to at least his vehicle it is not good practice to assume it applies to vehicles going forward.

And what about updates?

(Years ago -- 2002/2003 time frame -- I found a hard copy factory manual for one of my then new cars. Full retail price was $3000!. But I found it for sale at a dealer IIRC in Oregon for $300. Bought it. All 64lbs! Unpacking and going through the material it was all there. And then some. A good portion of the included material were updates, addendums, and supplements to bring the info up to date. But I had no way to get further updates. In a few years the factory stopped publishing hard copy manuals. And it even stopped providing digital copies on disc. The info was still available, to the dealer techs, via a link to the factory and its master factory service manual portal. The factory only had to keep this digital manual current. No need to print updates and ship these to dealers. No need to even make digital copies.)

Rather than continue to look for the info online I stopped in at the local BMW dealer and asked.

There was some mention made of "50%" tread depth difference being the point at which an old tire -- but otherwise good tire -- should be replaced when a new tire is being fitted on the same axle.

But I was told that when the car is brought in for a tire replacement the tech will measure tread depths and based on BMW info -- probably tied to the vehicle's VIN -- he will determine if the differences are within BMW guidelines for that vehicle. The tech has access to the latest info on this subject.

Back home further searching found mention of 1% difference (in circumference) being the maximum allowed difference. (This "1%" was mentioned in the discussion I had at the dealer, too.)

Using the tires on my 2024 230xi: P225/40 19 (front and rear) with a diameter of 26.100" a reduction of 1% of the tire's circumference works out to a tread depth change of 4/32 (0.125").

But as I mentioned in a previous post the dealer (service department) would have access to the correct/up to date info.

And this is important: I was told at the dealer that one can't apply this 50% or whatever number one arrives at across the entire BMW line.

The new X6 came in for special mention as its iDrive system is in some way different and thus even more sensitive to tire diameter differences.

[Pentland]

Originally Posted by RockCrusher

Found some vague/questionable links to "get" the TIS. Some sites offered the info for a subscription. Not willing to share my credit card info with these sites...

More searching and the mentions of TIS were of "versions" at least over a year old.

This highlights a problem. If a car owner obtains some info while it is hoped it applies to at least his vehicle it is not good practice to assume it applies to vehicles going forward.

And what about updates?



(Years ago -- 2002/2003 time frame -- I found a hard copy factory manual for one of my then new cars. Full retail price was $3000!. But I found it for sale at a dealer IIRC in Oregon for $300. Bought it. All 64lbs! Unpacking and going through the material it was all there. And then some. A good portion of the included material were updates, addendums, and supplements to bring the info up to date. But I had no way to get further updates. In a few years the factory stopped publishing hard copy manuals. And it even stopped providing digital copies on disc. The info was still available, to the dealer techs, via a link to the factory and its master factory service manual portal. The factory only had to keep this digital manual current. No need to print updates and ship these to dealers. No need to even make digital copies.)

Rather than continue to look for the info online I stopped in at the local BMW dealer and asked.

There was some mention made of "50%" tread depth difference being the point at which an old tire -- but otherwise good tire -- should be replaced when a new tire is being fitted on the same axle.

But I was told that when the car is brought in for a tire replacement the tech will measure tread depths and based on BMW info -- probably tied to the vehicle's VIN -- he will determine if the differences are within BMW guidelines for that vehicle. The tech has access to the latest info on this subject.

Back home further searching found mention of 1% difference (in circumference) being the maximum allowed difference. (This "1%" was mentioned in the discussion I had at the dealer, too.)

Using the tires on my 2024 230xi: P225/40 19 (front and rear) with a diameter of 26.100" a reduction of 1% of the tire's circumference works out to a tread depth change of 4/32 (0.125").

But as I mentioned in a previous post the dealer (service department) would have access to the correct/up to date info.

And this is important: I was told at the dealer that one can't apply this 50% or whatever number one arrives at across the entire BMW line.

The new X6 came in for special mention as its iDrive system is in some way different and thus even more sensitive to tire diameter differences.

Eh?