Author Topic: Flat spots when sitting (Read 1303 times)

84im · « **on:** March 21, 2005, 10:01:45 pm »

I've got a new set of Kumho ECSTA MX 215x40x17s on my Monster Miata (from TireTrends). If the car sits for a week or so it vibrates like the tires have a flat spot, for about 1/2 km. After that they're okay. Is this common? I've never had this problem before, but then again, I've never run a 40 series tire before (if that matters).

morty · « **Reply #1 on:** March 22, 2005, 02:59:55 am »

What is the temperature like? With the newer performance tires they have a nylon cap to protect the belts from impact. This a great feature, however, they generally do not like cold temperatures and can distort. Usually just lasts a short while until the tire heats up. Not common, but not unusual with this type of tire construction.

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capriracer · « **Reply #2 on:** March 23, 2005, 06:33:31 am »

Flat spotting is very sensitive to inflation pressure. So what pressures are you running and what does the placard says for tire size and inflation?

84im · « **Reply #3 on:** March 23, 2005, 01:03:51 pm »

I'll have to recheck the tire pressure. After having the car sit for only one night, there was no 'thump, thump, thump as I drove away.

canadasvt · « **Reply #4 on:** May 24, 2005, 10:50:23 pm »

never had that problem with my Civic 40 series tires.