Tire Size

[Grant Lenahan]

How did you get 6%? My math says >8%

c= 2*pi*R


Grant
On Feb 16, 2015, at 12:42 AM, <ekellock at gmail.com> <ekellock at gmail.com> wrote:

> The speedo difference would be 6% which means an indicated 75 is actually 80mph.
> 
> 
> Ed
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> From: Vincent Gelinas
> Sent: ‎Saturday‎, ‎February‎ ‎14‎, ‎2015 ‎2‎:‎59‎ ‎PM
> To: quattro at audifans.com
> 
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> 
> Hi, all. 
> 
> To update, it seems like I had a bad tire. I put the spare on and it all went away. I need four new tires now and I got them for free (almost new Goodyear Extra Grip Ice) but they're 215/65/16 instead of 215/55/16. That's less than an inch difference in  diameter if my math is right (10% of 215 mm is 21.5mm... 21.5mm is around 0.84 inches). 
> 
> I know this will cause my speedometer and odometer to read a little slow, but I'm wondering if it will fit under a stock suspension on a 2004 A6qA. C5 chassis. My research points to yes, but I would like the group's opinion. 
> 
> I would get the correct size, but beggars can't be choosers. 
> 
> Thanks in advance,
> 
> Vinney 
> 
> Sent from my iPhone
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