Sorry I forgot the rest of the world uses development rather than our
traditional system. The inches refer to the wheel size of an ordinary. With
a geared bicycle divide the front sproket by the rear cog multiply by the
wheel size (tradition is 27") and you get the gear in inches. In the rest of
the world you could multiply that number by pi convert the sum to meters and
you would have gear development. Our "English" gear chart is used as an
abstraction like the farenheit temperature scale.
Every old school trackie knows a 47x14 (90.6) as the sprinters 90 and the
50x15 (90.) as the pursuiters 90.
I hope you don't mind me sharing but, I should'nt address my sparse
comments to only a few middle aged Americans, Brits and pehaps a few
Italians.
T.Shaw
Santa Clara, California
> From: Dennis Young <mail@woodworkingboy.com>
> Date: Sat, 13 Mar 2004 20:57:03 +0900
> To: <terence@shawscycles.com>
> Subject: Inch means?
>
> Hi Terence,
>
> Can I trouble you to explain to me what you are referring to when using this
> inch notation to explain single speed gearing. How does this translate into
> gear sizes?
>
> Thanks.
>
> Dennis Young
> Japan
>
>
>> 55 to 75" effective range