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Gear Inches / Drivetrain software
Some interesting software for figuring out gear inches and ratios etc from your drivetrain. Tells you the max speed in each gear combination adjusted for cadence.... Runs on the PC www.income-software.com/GearCalc/ -- malcomm |
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"malcomm" wrote in message
... Some interesting software for figuring out gear inches and ratios etc from your drivetrain. Tells you the max speed in each gear combination adjusted for cadence.... Runs on the PC www.income-software.com/GearCalc/ Seems to be a bad link. -- malcomm FWIW, I've recently added a Gearing Calculator to my CycliStats ride log and training diary ( http://www.CycliStats.com ). You can see a screen shot of the Gearing Calculator on this page: http://www.shastasoftware.com/CycliStats/tools.htm (the Gearing Calculator is about halfway down the page). -- ~_-* ....G/ \G http://www.CycliStats.com CycliStats - Software for Cyclists |
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malcomm wrote:
Some interesting software for figuring out gear inches and ratios etc from your drivetrain. Tells you the max speed in each gear combination adjusted for cadence.... Runs on the PC www.income-software.com/GearCalc/ Took me about 20 minutes of doodling in a spreadsheet (the OpenOffice.org one in this case) to get the same effect. Cut and paste shown below. The notations on some of the rear gears are old; I now warm up in 52/18 and then do the entire ride in 52/16, thus using the hills for anaerobic intervals. --Blair "Runs on bananas." Ratios 42 52 24 1.8 2.2 22 1.9 2.4 20 2.1 2.6 warmup/down 18 2.3 2.9 Cruise 16 2.6 3.3 Sprint 14 3.0 3.7 Descent inches/crank @ 27 tire compressed 1/8 in (unused gears deleted from table) 24 147 22 160 199 20 176 218 18 243 16 273 14 312 cranks/mile 24 431 22 395 319 20 359 290 18 261 16 232 14 203 Mph @ 84 rpm 24 11.7 22 12.8 15.8 20 14.0 17.4 18 19.3 16 21.7 14 24.8 I was going to save a .csv file and post it, but apparently that doesn't preserve the formulae. It's pretty simple, though. Each gear_ratio is just chain_ring_teath/rear_cog_teeth. Then each inches_per_crank is just 3.14*(wheelsize-2*compression)*gear_ratio. Then each cranks_per_mile is just 5280*12/inches_per_crank. Then each mph@rpm is just 60*rpm/cranks_per_mile. |
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