Do Lower Profile Tires affect Speedometer Reading

[Ed Kellock]

It works out because you're taking 60% of 205 and 65% of 195. That's why one
number goes up and the other goes down.
 It's all about maintaining the diameter of the tire while having a narrower
contact patch on the road. This causes the need to displace or "cut through"
less snow and on ice, it concentrates the weight of your vehicle on a
smaller area thereby increasing traction.
 Ed

 On 11/9/05, mboucher70 at hotmail.com <mboucher70 at hotmail.com> wrote:
>
> I'm looking at a pair of 'performance winter' tires. The size is 195 55
> R15.
>
> My car's original equipment is 205 60 R15.
>
> I've read that for winter you should change the sizing by one each - that
> is either
>
> 205 60 R15 or
> 195 65 R15 or
> 185 70 R14 if load capacity allows.
>
> I'm a bit confused by this rule. I understand that the tire profile change
> is ofset by a rim size change. So then, wouldn't 205 60 R15 and 195 65 R15
> give different speedometer readings, since the rim size is the same but the
> profile is different?
>
> Bottom line question is will moving from 205 60 R15 TO 195 55 R15 work on
> my car (1990Audi100) or will it change my speedometer readings?
>
> Other question, where is a good place to get inexpensive winter rims
> (Wal-Mart, etc)? It uses 6Jx15 rims. Are these standard rims, or specialized
> Audi rims? I've noticed that most Audis use the 5-bolt tires, but mine uses
> a 4-bolt.
>
> Thanks
>
> Charles
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