Agreed, my limited experience backs this up. Three of my 15x8's fell in my lap from a guy who wrecked his car and needed cash. I'd have much preferred 15x9 but the deal was too good. Maybe someday I'll try the x9s, but I've got bigger fish to fry at the moment.

 

So I got the 15x 8 Konigs, wrapped in 205/50/15 kuhmo xs. Tires work great for auto x but.. ..I have lost two tires due to rapid tire pressure loss while driving ( to work) Both times in cool weather. Any suggestions?

 

what??

what tire pressures do you run? what do you mean you lost them? did they come off the bead?

 

Have been running about 30 psi, cold. While I am driving they just suddenly lose pressure. Then the rim burnes a stripe in the sidewall. When I was having the tires installed, the shop was having a hard time getting the bead to not leak.

 

Some of the lighter Konigs, such as the Helium, are not recommended for competition use (by mfr). Perhaps they are flexing too much?

 

I think I've seen d0r1ft0 jackasses complain about this when running 185's on x8 rims but I just assumed it was due to the stupid stretched tire. I would not consider the 205 on an 8 to be a stretch. I've run this combo with year round with s.drives on the street and nt-01 for track days and I luvs it muy mucho. Maybe the kuhmo xs just does not like that wide a rim

Related: The "post-your-stretched-tires" thread on CR makes me ill

 

These are the Konig flat out's. I am leaning towards the kuhmo tires not liking it..

 

I have 205/50-15 Kumho XS on 8" 6ULs with zero trouble. I still do not think I understand what you are relaying.

Are you saying that you have the tires set to 30psi cold, cooler weather drops that pressure below that, and when you drove on the lower pressure - the tires were losing the bead and releasing the majority of the air pressure left? Basically causing a flat tire?

This sounds like something is defective:

A) The tire installers
B) The particular set of wheels
C) The particular set of tires

 

Yes, exactly what you just wrote. Lower temp = leaky bead. Lower temp only caused about a three psi drop though..

 

Maybe for street I just need to use a much higher pressure..

 

If that works, it will be a band aid covering up a larger problem. A 30psi-27psi drop shouldn't be allowing the bead to come off with that setup.

 

Kinda how I thought. Could the shop that mounted them have possibly messed up the bead? I did notice their machine struggled quite a bit getting them on. I've watched lots of tires be installed and this looked like it was tough.

 

I was really curious because the person who sold me the wheels, told me that a 205 is too narrow, but all I find here is people calling it the hot ticket.

 

What is the date on the tires? May have been in stock for years.

 

maybe the wheel is damaged. Only thing I can think of is a slight flatspot/bend is causing the leak. Or maybe the tire is badly out of shape, but this is definitely not normal behavior. You should easily be able to drive on a tire at 20-22psi I would think...

 

Brand new wheels. I'll check the tire date. Auto crossing, the tires acted very well. I'll check the date though.

 

I would try taking them to another shop in town - preferably one with some experience with aftermarket or track cars - and have them dismounted, inspected, and remounted.

There is a defect or problem somewhere.

 

Good idea.