gear inch to mph formula

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

johnson.. said:

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

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.
securityfocus.com169Open ↗
nocards.comindex.shtmlOpen ↗
stoprfid.orgstoprfid.orgOpen ↗
"Tom Sherman" <[email hidden]> wrote in message
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Quoted message said:

johnson.. said:

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.

Quoted message said:

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

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

"frank & alma" <[email hidden]> wrote in message
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Quoted message said:

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

If you know gear inches, then at 100 rpm multiply GI by .3 to give
approximate speed ie 80 inches = 24 mph.
"johnson.." <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

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.