If a ratio isn't specified, the default is approximately 80%... (I
thought I recalled it being 82%, but that could be a faulty memory).

On Jul 23, 2008, at 10:40 AM, Ben Cichowski wrote:

> Hi Jeff,
>
> We'd have to know the ratio on the first tire (someone probably
> knows that tire by memory though, it's a popular tire).
>
> The first number is the width in mm and the second number (70 in the
> case of the Michelin tire) is the % of that first number that makes
> up the sidewall. So your 205/70R14 is about equiv to a 185/78R14 in
> overall diameter (143.5 mm of sidewall).
> If that second number is bigger than 78 on your Hancook...then your
> old tires are larger in diameter...which I'm pretty sure it is
> indeed larger.
>
> So, if both are 14" tires, I'm guessing your new tires are smaller
> in overall diameter and will spin faster...i.e. show you going
> faster than you actually are.
> BTW....you are talking about a 205/70R14 as the message
> said...right? Because that is a pretty common 15" size.....
>
> -Ben
>
>> Date: Wed, 23 Jul 2008 09:20:55 -0500
>> From: magikvw@GMAIL.COM
>> Subject: Tire Question (not the dreaded tire thread at all)
>> To: vanagon@GERRY.VANAGON.COM
>>
>> Ok, this may seem like a dumb question but oh well -
>>
>> If I went from Hankook 185R14 tires to a Michelin 205/70R14 would
>> one expect
>> a change in my speedo and odometer accuracy?
>>
>>
>> --
>> Thanks,
>>
>> Jeff
>> '90 Carat (Grover)
>> '86 (We call this one Parts)
>> '78 Bus (Melissa) Patty's Bus
>
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