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Bicycle Gearchart Calculator

Please note: This application is an unabashedly direct rip-off of Mike Sherman's Bicycle Gear Calculator. All I did was add a bit of code to generate the required capacities for the front and rear derailleurs, since I find that information useful and Mike's original doesn't include it.

Title
Cassette
Required Rear Derailleur Capacity:					Select a Cassette My touring bike 5 speed 13-30 ----------------- 5 Speed Freewheel 14-18 5 Speed Freewheel 14-22 5 Speed Freewheel 14-24 5 Speed Freewheel 14-26 5 Speed Freewheel 14-28 5 Speed Freewheel 14-32 5 Speed Freewheel 14-34 5 Speed Freewheel 13-17 5 Speed Freewheel 13-18 5 Speed Freewheel 13-22 5 Speed Freewheel 13-24 5 Speed Freewheel 13-26 5 Speed Freewheel 13-28 5 Speed Freewheel 13-32 5 Speed Freewheel 13-34 ----------------- Sachs 6 Speed Freewheel 13-18 Sachs 6 Speed Freewheel 13-21 Sachs 6 Speed Freewheel 13-24 Sachs 6 Speed Freewheel 13-26 Sachs 6 Speed Freewheel 13-28 ----------------- Sachs 7 speed freewheel 12-19 Sachs 7 speed freewheel 12-21 Sachs 7 speed freewheel 13-21 Sachs 7 speed freewheel 12-24 Sachs 7 speed freewheel 13-24 Sachs 7 speed freewheel 13-26 Sachs 7 speed freewheel 12-28 Sachs 7 speed freewheel 13-28 Sachs 7 speed freewheel 13-30 Sachs 7 speed freewheel 13-32 Sunrace 7 speed freewheel 13-28 Shimano 7 speed cassette HG 70 11-28 Shimano 7 speed cassette HG 90 12-21 Shimano 7 speed cassette HG 90 12-28 Shimano 7 speed cassette HG 90 13-21 Shimano 7 speed cassette HG 90 13-23 Shimano 7 speed cassette HG 90 13-26 Shimano 7 speed cassette HG 90 13-28 Shimano 7 speed cassette HG 90 13-30 Shimano 7 speed cassette HG 90 14-32 Shimano 7 speed cassette HG 90 13-34 ----------------- Sachs 8 speed freewheel 12-19 Sachs 8 speed freewheel 12-21 Sachs 8 speed freewheel 12-24 Sachs 8 speed freewheel 12-26 Sachs 8 speed freewheel 12-28 Sachs 8 speed freewheel 13-28 Sachs 8 speed freewheel 12-30 Sachs 8 speed freewheel 13-30 Sachs 8 speed freewheel 12-32 Shimano Deore XT 8 Speed IG Cassette 11-28 Shimano Deore XT 8 Speed IG Cassette 11-30 Shimano XTR 8sp HG Cassette 12-28 Shimano XTR 8sp HG Cassette 12-32 Shimano Dura Ace HG 8 spd Cassette 12-21 Shimano Dura Ace HG 8 spd Cassette 12-23 Shimano Dura Ace HG 8 spd Cassette 12-25 Shimano Dura Ace HG 8 spd Cassette 13-23 Shimano Dura Ace HG 8 spd Cassette 13-26 Shimano HG50 8spd Cassette 12-21 Shimano HG50 8spd Cassette 12-23 Shimano HG50 8spd Cassette 12-25 Shimano HG50 8spd Cassette 13-26 Sram 5.0 8 speed Cassette 11-32 Sachs 8 speed Quartz Cassette for Sachs Freehubs 11-28 Sachs 8 speed Quartz Cassette for Sachs Freehubs 12-32 Campagnolo 8 Speed Cassette 12-23 Campagnolo 8 Speed Cassette 13-23 Campagnolo 8 Speed Cassette 13-26 ----------------- Sram 7.0 9 Speed Cassette 11-32 Shimano XTR TI 9 speed Cassette Cogs 11-30 Shimano XTR TI 9 speed Cassette Cogs 12-2 Shimano XTR 9sp Mega 9 Cassette 12-34 Shimano Dura Ace 9 Speed Cassette 11-21 Shimano Dura Ace 9 Speed Cassette 11-23 Shimano Dura Ace 9 Speed Cassette 12-21 Shimano Dura Ace 9 Speed Cassette 12-23 Shimano Dura Ace 9 Speed Cassette 12-25 Shimano Dura Ace 9 Speed Cassette 12-27 Shimano M750 9 speed Cassette 11-32 Shimano M750 9 speed Cassette 12-34 Shimano M750 9 speed Cassette 11-34 Shimano Ultegra 9 speed Cassette 11-21 Shimano Ultegra 9 speed Cassette 11-23 Shimano Ultegra 9 speed Cassette 12-21 Shimano Ultegra 9 speed Cassette 12-23 Shimano Ultegra 9 speed Cassette 12-25 Shimano Ultegra 9 speed Cassette 12-27 Shimano Ultegra 9 speed Cassette 13-23 Shimano Ultegra 9 speed Cassette 13-25 Shimano Ultegra 9 speed Cassette 14-25 Shimano HG70 9 speed Cassette 12-23 Shimano HG70 9 speed Cassette 12-25 Shimano HG70 9 speed Cassette 13-23 Shimano HG70 9 speed Cassette 13-25 Shimano HG70 9 speed Cassette 11-32 Campagnolo 9 Speed Cassette 11-21 Campagnolo 9 Speed Cassette 11-23 Campagnolo 9 Speed Cassette 12-21 Campagnolo 9 Speed Cassette 12-23 Campagnolo 9 Speed Cassette 13-23 Campagnolo 9 Speed Cassette 13-26 Campagnolo Chorus E d 9 speed Cassette 12-21 Campagnolo Chorus E d 9 speed Cassette 12-23 Campagnolo Chorus E d 9 speed Cassette 13-23 Campagnolo Chorus E d 9 speed Cassette 13-26 Campagnolo Veloce Cassette 9 speed 12-21 Campagnolo Veloce Cassette 9 speed 11-23 Campagnolo Veloce Cassette 9 speed 12-23 Campagnolo Veloce Cassette 9 speed 13-23 Campagnolo Veloce Cassette 9 speed 13-26 Campagnolo Veloce Cassette 9 speed 13-28 ----------------- Campagnolo 10 speed Cassette 11-21 Campagnolo 10 speed Cassette 11-23 Campagnolo 10 speed Cassette 12-25 Campagnolo 10 speed Cassette 13-26 Campagnolo 10 speed Cassette 13-29

Chainrings			Wheel	Crank
			27 x 1 3/8 27 x 1 1/4 27 x 1 1/8 27 x 1 700 x 44 700 x 38 700 x 35 700 x 32 700 x 28 700 x 25 700 x 20 26 x 2.125 26 x 1.9 26 x 1.5 26 x 1.25 26 x 1.0 = 559mm 650c wide tubular tubular 26 x 1 3/8 = 590mm 24 24 x 1 = 520mm 20 x 1.75 = 406mm 20 x 1 1/4 = 451mm 17 x 1 1/4 = 369mm 16 x 1 3/8 = 349mm	155 160 162.5 165 167.5 170 172.5 175 177.5 180 182.5 185
Required Front Derailleur Capacity:

Gear Table

Semi-Log Graph
Semi-Log Graph

Sheldon Brown's Gain Ratio Chart
Sheldon's Ratios

Rollout Table     Inches Meters
Rollout Table

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