<VV> SPEEDOMETER off by a factor of 20%?

[Charlie]

Isn't the speed a function of tire diameter, not width? 

The "85" relates to width::height ratio, so 85x13 would have a slightly
smaller ~ hardly measurable? ~ diameter than 75x13, so you'd be going slower
than the speedo says, but not by a factor of 20%-25%?

Charlie

-----Original Message-----
From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
MarK Durham via VirtualVairs
Sent: Wednesday, December 24, 2014 9:55 AM
To: jvhroberts at aol.com
Cc: VirtualVairs at corvair.org; Rnojunkmail at aol.com
Subject: Re: <VV> SPEEDOMETER

The speedo is run by a plastic gear that slides into the side of the trans
and you can get plastic gears with different teeth on them to adjust for
tire size changes. Look at page 124 in Clarks catalog for parts.
There is a retainer bolt and a o ring seal to pay attention to but it can be
easily done.
Mark Durham
Hauser Idaho
62 Coupe
On Dec 24, 2014 8:23 AM, "John Roberts via VirtualVairs" <
virtualvairs at corvair.org> wrote:

>
> You might need to take it to a speedo shop. I've had old speedos in 
> other cars do this, usually a bit of rust on the hairspring causes a 
> loss of tension, hence a higher reading.
>
> John Roberts
>
>
> -----Original Message-----
> From: Rnojunkmail at aol.com via VirtualVairs <virtualvairs at corvair.org>
> To: VirtualVairs <VirtualVairs at corvair.org>
> Sent: Wed, Dec 24, 2014 8:57 am
> Subject: <VV> SPEEDOMETER
>
>
> My speedometer on my 63 monza reads 60 when I'm only doing 48 or 50. I 
> dont think this is the original trans. If it had a 3 spd manual 
> instead, would it jive with the speedo m eter? I also have 75x13 
> instead of 85x13 's. My 65 is much simpler with the speedometer cable 
> attached to the drivers wheel. Can I fix this? PS. I flunked physics .
> Sent from my Verizon 4G LTE Smartphone  
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