gear inch to mph formula

[johnson..]

Hi All
Looking for this formula:

chainring /
cog x
wheel size x
pi /
88 /
something x
cadence =
miles per hour

the rest i forget but it gives the speed based on cadence in mph. Anyone
know the rest or something other formula that does the job? Thanks a bunch.

 

[frank & alma]

If I remember correctly, gear inches times cadence divided by 336 equals
mph. Try Sheldon Brown though, I have been wrong in the past.
Skip

 

[Tom Sherman]

johnson.. wrote:
> Hi All
> Looking for this formula:
>
> chainring /
> cog x
> wheel size x
> pi /
> 88 /
> something x
> cadence =
> miles per hour
>
> the rest i forget but it gives the speed based on cadence in mph. Anyone
> know the rest or something other formula that does the job? Thanks a bunch.

Email me if you want an Excel spreadsheet that calculate gear inches,
development (in meters) and mph for a given crank rpm for triple crank,
da Vinci quad, SRAM DualDrive, Schlumpf Speed and Mountain drives,
Rohloff hubs, jack-shaft step-up gear, and Rotator type mid-drive systems.

--
Tom Sherman – Quad City Area

 

[johnson..]

Hi Tom
Thanks for the offer but avast virus scanner will not allow any
attachments to be opened on this computer.

--
Radio Frequency IDentity tags. The end of privacy.
http://www.securityfocus.com/columnists/169
http://www.nocards.com/welcome/index.shtml
http://www.stoprfid.org/
"Tom Sherman" <[email protected]> wrote in message
news:[email protected]...
> johnson.. wrote:
> > Hi All
> > Looking for this formula:
> >
> > chainring /
> > cog x
> > wheel size x
> > pi /
> > 88 /
> > something x
> > cadence =
> > miles per hour
> >
> > the rest i forget but it gives the speed based on cadence in mph. Anyone
> > know the rest or something other formula that does the job? Thanks a
bunch.
>
> Email me if you want an Excel spreadsheet that calculate gear inches,
> development (in meters) and mph for a given crank rpm for triple crank,
> da Vinci quad, SRAM DualDrive, Schlumpf Speed and Mountain drives,
> Rohloff hubs, jack-shaft step-up gear, and Rotator type mid-drive systems.
>
> --
> Tom Sherman – Quad City Area
>

 

[johnson..]

Hi Yous
I just used your formula, looks about right. Thanks


"frank & alma" <[email protected]> wrote in message
news:[email protected]...
> If I remember correctly, gear inches times cadence divided by 336 equals
> mph. Try Sheldon Brown though, I have been wrong in the past.
> Skip
>
>

 

[harv]

If you know gear inches, then at 100 rpm multiply GI by .3 to give
approximate speed ie 80 inches = 24 mph.
"johnson.." <[email protected]> wrote in message
news:[email protected]...
> Hi All
> Looking for this formula:
>
> chainring /
> cog x
> wheel size x
> pi /
> 88 /
> something x
> cadence =
> miles per hour
>
> the rest i forget but it gives the speed based on cadence in mph. Anyone
> know the rest or something other formula that does the job? Thanks a
bunch.
>
>