On my 2004 S2000, about 2 weeks ago had brand new Dunlop Direzza Z1 Star Specs installed by a local garage. A few days later, the driver's side rear tires was extremely low on air pressure, that I noticed after the car was pulling to one side during acceleration/letting off the gas pedal.

So I filled it up with air again and it seemed to be ok. The car was outside during below freezing temps so I thought that maybe that led to the low pressure.

Well fast forward, the car has only been driving maybe ~100-200 miles since the tires were installed. Driving to work I was experiencing the same symptoms, and low and behold the same tire is extremely low on air. I fill it back to 32 psi and now the whole car is vibrating/shaking pretty badly, even at low speeds. I'm thinking I might have a bad tire/defective mount?

Not sure, but seeing if anyone else has experienced something similar. I checked and rechecked and put all the tires to 32 psi and it's still bad. Funny thing is, this morning driving in to work the car was not shaking like this until after I filled the tire up.

 

What about wheel out of balance? May be the weight fell off.

 

[QUOTE=RedJet,Feb 15 2010, 09:55 AM] On my 2004 S2000, about 2 weeks ago had brand new Dunlop Direzza Z1 Star Specs installed by a local garage.