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09-07.-2004, 06:15 AM
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#1 |
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Guest
Posts: n/a
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gear inch to mph formula
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. |
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09-07.-2004, 08:02 AM
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#2 |
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Guest
Posts: n/a
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Re: 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 |
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09-07.-2004, 10:15 AM
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#3 |
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Guest
Posts: n/a
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Re: gear inch to mph formula
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 |
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09-07.-2004, 06:30 PM
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#4 |
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Guest
Posts: n/a
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Re: gear inch to mph formula
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" <tsherman@qconline.com> wrote in message news:2l67l0F9bgdjU1@uni-berlin.de... > 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 |
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09-07.-2004, 06:46 PM
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#5 |
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Guest
Posts: n/a
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Re: gear inch to mph formula
Hi Yous I just used your formula, looks about right. Thanks
"frank & alma" <fwilliamsjr@sc.rr.com> wrote in message news:cwjHc.103830$wH4.5964598@twister.southeast.rr.com... > 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 |
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10-07.-2004, 03:20 AM
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#6 |
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Guest
Posts: n/a
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Re: gear inch to mph formula
If you know gear inches, then at 100 rpm multiply GI by .3 to give
approximate speed ie 80 inches = 24 mph. "johnson.." <merifreekinxmas@yahoo.ca> wrote in message news:2l5r23F8k7etU1@uni-berlin.de... > 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. |
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