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*To*: joelc@hookup.net*Subject*: Re: snow tire size.*From*: PDQSHIP@aol.com*Date*: Sun, 26 Nov 1995 23:45:15 -0500*cc*: quattro@coimbra.ans.net*Sender*: quattro-owner@coimbra.ans.net

In a message dated 95-11-26 11:09:39 EST, you write: > >I received a message from the post master that the following message never >got posted. Come to think of it, I never did get "my copy" of the message >either. That being said, here comes the questions once again! As it is now >snowing in Toronto, any and all responses would be apprecated. > >The summer tires on my Audi are 205/55/16. I know that I can get 15 inch >tires around the calipers so the question is.... what is the correct size >winter tire? I think that it is 195/65/15 but I am not sure. Any help >would be appreciated! > >Also, what is the mathematical formula to determine what size of tires are >equivalent! > > 205/55 16 means: 205/25.4 = 8.07 tire width then 8.07 X .55 (aspect ratio = height relation to width) = 4.44 X 2 (rim to ground and rim to top of tire) = 8.88 then 8.88 + 16 (inch wheel) = 24.88 tire diameter so a 195/65 15 will give you a 24.98 diameter or .05" higher height a 205/60 15 will give you a 24.68 diameter or .1" higher height So either one will work with very little, if any speedo error...... My 5ktq runs 205/55 on 16X7.5's in the summer and 205/60 on 15X7's in the winter..... Me, I would take the 60's, the 65's tend to float too much at higher speeds, most snows are not known for sidewall stiffness....... HTH Scott

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