"W" markings on speedo

[Cody Forbes]

That seems odd in this instance. Haven't we seen like 4 different W numbers for cars with the same final drive? 

-Cody Forbes

On Jul 28, 2012, at 3:08 PM, Mike Arman <Armanmik at earthlink.net> wrote:

> 
> 
> The "W" marking (a number) on the speedo indicates which final drive ratio that speedo should be used with to get a correct indication.
> 
> When I was fooling with BMW motorcycles (vintages 1950 through 1969), I made a list of the W numbers and the final drive ratios they matched up to. Similar lists are floating around the internet.
> 
> For instance, a W=1.2 goes to a 27/8 final drive, and the indicated speed will then be accurate (or as accurate as can be expected). Those numbers may not be correct, it has been a few years, but that's what they are for.
> 
> Best Regards,
> 
> Mike Arman
> 90V8Q
> and a bunch of old BMW bikes
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