USER INSTRUCTIONS: The BLUE entry points   Blue  below are where you may enter combinations of different values for the number of teeth on the CHAIN RING and REAR sprockets and the chart will compute the resulting Wheel Sizes for the different Gear Settings. If your browser is MS Internet Explorer then to compute the result after entering new data you may press Enter or click on any other part of the form. With other browsers use only the second method. On changing the option in the combo box the result is computed automatically.

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Mouse or Keyboard TAB key: You may reach the DATA ENTRY points by pressing the TAB KEY on your Keyboard which cycle you through the various data entry points or by MOUSE CLICKING the entry point allowing you to enter different spocket teeth values for comparison combinations.
HELP Messages & Notes: On the right side of the chart, you will see the words HELP and NOTE. MOUSE CLICK on these words for the Help or Note message associated with that area.

SRAM 6 Speed Rear Derailleur with 3 Gear Hub with/without Mountain Drive Option

   

inches

Brompton Standard Wheel Size

Data
Entry
Area

Front Chain Ring

teeth

teeth

teeth

LARGE Rear Sprocket

SMALL Rear Sprocket

Resulting Sprocket Ratio

inches

inches
Note

Resulting Direct Drive Wheel Size

Note

REAR HUB GEAR SELECTION

Resulting Wheel Size

Resulting % of Direct drive
With Mountain Drive Engaged

With LARGE rear sprocket engaged

1st gear

inches

inches

inches

inches

inches

inches

29.2%

2nd gear

40%

Note

3rd gear

54.4%

With SMALL rear sprocket engaged

1st gear

29.2%

2nd gear

40%

Note

3rd gear

54.4%

Without Mountain Drive Engaged

With LARGE rear sprocket engaged

1st gear

inches

inches

inches

inches

inches

inches

73%

2nd gear

100%

Note

3rd gear

136%

With SMALL rear sprocket engaged

1st gear

73%

2nd gear

100%

Note

3rd gear

136%