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[Kleinacus]

So I've had my 335 since the end of Feb and I'm pretty sure one of my run flats has had a slow leak since delivery. I've looked a few times and do not see any bubbles or a nail/screw in the tire. I'm going to try and figure out where the leak is this weekend with some soapy water.

However, I've read a few posts of people that had success inflating problem RFT's to 45 psi and having it 'set' itself. If anyone has had any luck with this, can they please chime in and let me know how long it took to notice no psi loss? I'd like to avoid riding around in Phila with a tire at 45 psi as it is already a war between me, the run flats, and the potholes.

BTW, I'm trying to avoid taking it to a dealership around here as I've heard some horror stories of wheel/tire insurance coverage when taking your car to a dealership outside of where you purchased the car (Flemington, NJ).

Thanks guys.

[noro]

It sounds like the leak maybe around the edge somewhere. I had this issue with non original tires and the problem was that a little piece of rubber from the molding process was stuck between the rim and the tire and was letting air out.

The issue is that you may find nothing after taking the wheel off and checking it in water because the tire will not have any vertical load on it which may be what's opening an air gap.

Try pouring water around the edge of the tire while it is still on the car, sometime a little wetness is enough to her the air come out.

Ultimately the only solution is to remount the wheel and ask the person performing the job to really clean up the rim/tire sealing area.

Also check the stem area in case that's where it's coming from.

[Kleinacus]

Thanks. Yeah, I was going to try the soapy water in a spray bottle. For the time being, I don't really have a driveway to even jack the car up. The leak only requires air every 2 weeks or so. If I can't find it / fix it, I'll just wait until I'm back in NJ and have them fix it.

[demosthenes]

How much pressure does the tire lose every week?

[Kleinacus]

3-4 psi. Probably closer to 3. I filled the fronts to 32 and rears to 36 about 2 weeks ago. (manual specified for LT 100 mph as I'm generally below that in the city) Low tire light came on and when i checked I was in the 28-29 psi area for that one back left tire.

[demosthenes]

I had a slow leak in a RFT that lost about 3 psi every week. It turned out to be a screw and a nail without a head.

After the problem above, a total loss due to a nail in the edge and another problem, I replaced the RFT's with PS2's. I can't explain why RFT's seem to have more problems than other tires, but I had 3 problems in less than a year.

[Aurora Bearialis]

I've had the exact same problem on my rear driver's side tire. My conclusion though it may sound dumb I think is what is happening. When it gets cold here (yeah I know So Cal lol) but in the morning when it was chilly I wold get in my car and would receive a TPM warning saying low pressure. I went to the gas station to fill up on air and they also have a gauge there too. So I check all the tires and they are all at the PSI they are supposed to be at. The tire I had problems with seemed to lose PSI when the weather was cold out and I would have to fill up the tire every week almost. Now, since it had warmed up I haven't done it since early February or even January. I know it sounds weird but due to the cold weather it may let out PSI. ALSO, I had to fill up all the tires once also during that DSR tire dilemma so it proves that with the cold air ALL tires may be losing a little bit of pressure but for some reason the driver's side rear tire lost more pressure faster.

[Kleinacus]

Yeah, I should be on 189's with dunlop direzza SS's soon so I won't be on RFT for long. However, I'll still probably use the 17" run flats for my winter f around set so I'd like to remedy it if possible.

[demosthenes]

Good. If you don't fix it and the tire goes a while with little or no air, most shops won't repair it because the tire will be shot. Big bucks to buy a new one.

[kefler]

I had the exact problem with the rear-left tire, I tried looking at it from every angle but never found anything. Since I had the wheel/tire insurance I took it to the dealer, and they found a nail.

They don't patch RFT's so they replaced the tire, but it was all free along with the first oil change. I paid 399 for the wheel/tire insurance and their price for the tire install would have been $422 (still woulda been like 360 at another local shop). So the wheel/tire insurance was worth it.

[Oulixes]

Originally Posted by jklein5525

So I've had my 335 since the end of Feb and I'm pretty sure one of my run flats has had a slow leak since delivery. I've looked a few times and do not see any bubbles or a nail/screw in the tire. I'm going to try and figure out where the leak is this weekend with some soapy water.

However, I've read a few posts of people that had success inflating problem RFT's to 45 psi and having it 'set' itself. If anyone has had any luck with this, can they please chime in and let me know how long it took to notice no psi loss? I'd like to avoid riding around in Phila with a tire at 45 psi as it is already a war between me, the run flats, and the potholes.

BTW, I'm trying to avoid taking it to a dealership around here as I've heard some horror stories of wheel/tire insurance coverage when taking your car to a dealership outside of where you purchased the car (Flemington, NJ).

Thanks guys.

On a similar problem, my dealer found a leak in the rim. To be more specific, the air leaked directly throw a flow in the alloy body of the rim.