--- In st2_owners@yahoogroups.com, Nick Vale <nickvale@...> wrote:
>
> No, I understood what you meant! My original ST4 read slightly slow
> according to my mates - my indicated 8- was their indicated 85 (no gps's
> then).
>
> I believe the mileometer reads OK because it's a pure mechanical link,
> whereas the actual speedo somehow uses an induced/indirect feed - but
> the big list is much more active, so I'll cross post to it for a
> definitive answer!
>
> Cheers - Nick
Both the speed AND the mileage are based on a nominal circumference of the front wheel so both will vary somewhat, depending on the design and state of the front tyre. At the moment, my UK-market ST4 is reading spot-on versus the GPS throughout the speed range, but a fresh set of rubber is waiting to go on, so it may soon change....
NickW, UK
Nick,
Isn't it strange when we change our worn to the cords rear tires that our bike seems to be slower off the line but has more top speed and better gas mileage?
Bingo. The taller new rear tire has changed the overall gearing. Just the same as it does for the worn front tire(if that is where your speedo pickup is)
Physics, you gotta love it.
Ciao, Nick Alaniz
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