[Bcube]

Especially any GS Spyder owners.

Could anyone please give me the Tire Pressure data on your door sill and the lowest pressure recommended in your owner's manual?

Reason being is that my '05 Spyder originally delivered with the seven spoke 18 inchers with Michelins. So all data for my car is for that size wheel/tire. But I have the 19" GS wheels with P-Zeros.

I am experimenting/trying to find a decent and reasonable pressure for this wheel/combo - within the min/max limits - to help ride quality and prevent the initial flat spotting that upsets the Spyder so much. (The dreaded cowl/column shake onslaught - you spydey folks know what I"m talking about. )

 

[DeaneG]

Door sticker: 35/32 psi f/r
Manual: 2.4/2.2 bar (about 35/32) f/r

I have run mine as low as about 30/30, but it didn't significantly calm things.

 

[Bcube]

Thanks Deane.

Damn. I am currently running 32/32 psi. Which is too low for the fronts per your data. I guessimated those numbers based upon my manual's allowance of 29/29 psi on 18 inchers.

I did have my fronts at 35psi for a while and I can "feel" a (better) difference at 32 psi. The front tires don't seem to transmit the impact from sharp ridges so strongly - thus, i was perceiving not quite so much cowl shake...or rather not quite so often.

 

[DeaneG]

I now call the cowl judder "charm" and go with the flow. When my wristwatch starts rattling, I take it off.