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[racingBMW]

This is my first vehicle with run flat tires and I was wondering how u can tell if you punctured your tire. or if there is a leak? will the OBC let you know?

[FunRevn]

Yes..... Actually if you change air presure your supossed to reset the computer. You can check it all out in the manual.. Enjoy!

[lkevinl]

OBC will let you know. You'll get a tire pressure warning. It happened to me in my 325 loaner. Got a huge hole in the run-flat and the tire pressure warning fired.

[Acheron]

Originally Posted by racingBMW

This is my first vehicle with run flat tires and I was wondering how u can tell if you punctured your tire. or if there is a leak? will the OBC let you know?

It's supposed to and I had a friend w/nail in one and he said it did immediately, however the nail was large enough to fully puncture the tire so honestly I'm not sure if you get a small one in it I cant comment on that.

[racingBMW]

thank, cuz i just got back home from the freeway and ran over what seemed like a piece of wood on the expressway. everything looks fine. but when i hit it on the freeway i smelt something burning . i guess im just a little paranoid.

[DasBlitz]

Originally Posted by racingBMW

thank, cuz i just got back home from the freeway and ran over what seemed like a piece of wood on the expressway. everything looks fine. but when i hit it on the freeway i smelt something burning . i guess im just a little paranoid.

Well if the system did not go off and it does not sound strange. Next thing to do is check them yourself. Use your hands to check for any inconsistencies, objects sticking out etc.

When I got a nail in my runflat the system came on checked and found the nail.

Patched it up. Now works great.

[328 B.X.i]

You can patch up RFTs? I had a nail in my tire around the Cape Cod area, and the light came on for a flat. I put my hand through the threads to find the nail, and brought into a local BMW dealer to fix it. They told me that you can't patch RFTs and that if you get a nail you have to replace the tire altogether. Were they screwing me? (I had the rim/tire protection, thank god, so nothing came out of my pocket regardless, but I'm just curious)

[RedGT3]

^^^ Yes they are. It drives me crazy every time I take the 335 or the 530 in for service they want to change a tire because of a nail. Are this tire that soft?

[Orient330iNYC]

its liability concerns.
A run flat tire can be patched just like a normal tire IF and ONLY IF the tire never ran at very lowair pressure. driving at very low pressure damages the sidewalls, requiring a replacement.

Now the dealer has no idea if the tire went completely flat, how long and how loaded the tire was when it was low/had no air pressure. there's no way to tell how much internal damage was sustained. for them, its safer to assume worse case scenario and replace the tire.

i wouldn't have any issues getting a RFT plug-patched if the puncture was within the scope of a normal tire repair (size and location) and i had not let the tire run on low pressure (ex: a nail in the tire that holds air, or leaks slowly). There's nothing magical about a run flat aside from the reinforced sidewalls, once you have to use those, its pretty much replacement time.