Example & Explanation of SRAM 6 Speed Derailleur with 3 Gear Hub with/without Mountain Drive Option Chart

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

   

Standard
16.375

inches

Notes Sprocket ratios other than the Brompton Standard ratio

Brompton Standard Wheel Size

The "Actual" physical wheel diameter size

Data
Entry
Area

Front Chain Ring

50

teeth

15

teeth

13

teeth

The number of teeth in the Front Chain Ring (You will be allowed to vary this)

Large Rear Sprocket

The number of teeth in the LARGE Rear sprocket (You will be allowed to vary this)

Small Rear Sprocket

The number of teeth in the SMALL Rear sprocket (You will be allowed to vary this)

1st Resulting Sprocket Ratio

3.333 to 1

3.846 to 1

Resulting ratio with the  LARGE Rear Sprocket engaged

2nd Resulting Sprocket Ratio

Resulting ratio with the  SMALL Rear Sprocket engaged

Resulting 1st Direct Drive Wheel Size

54.6

inches

63.0

inches

Resulting WHEEL SIZE in Direct Drive from 1st Sprocket ratio above

Resulting 2nd Direct Drive Wheel Size

Resulting WHEEL SIZE in Direct Drive from 2nd Sprocket ratio above

REAR HUB GEAR SELECTION

Resulting Wheel Size

With
Mountain
Drive
Engaged

With LARGE rear sprocket engaged

1st gear

15.9

inches
21.8

inches
29.7

inches
18.4

inches
25.2

inches
34.3

inches

Resulting Wheel Sizes with LARGE Rear Sprocket & Mountain Drive engaged

With Rear Hub 1st gear engaged

2nd gear

With Rear Hub 2nd gear engaged (direct drive)

3rd gear

With Rear Hub 3rd gear engaged

With SMALL rear sprocket engaged
1st gear

Resulting Wheel Sizes with SMALL Rear Sprocket & Mountain Drive engaged

With Rear Hub 1st gear engaged

2nd gear

With Rear Hub 2nd gear engaged (direct drive)

3rd gear

With Rear Hub 3rd gear engaged

Without
Mountain
Drive
Engaged

With LARGE rear sprocket engaged
1st gear

39.8

inches
54.6

inches
74.2

inches
46.0

inches
63.0

inches
85.7

inches

Resulting Wheel Sizes with LARGE Rear Sprocket & Mountain Drive disengaged

With Rear Hub 1st gear engaged

2nd gear

With Rear Hub 2nd gear engaged (direct drive)

3rd gear

With Rear Hub 3rd gear engaged

With SMALL rear sprocket engaged
1st gear

Resulting Wheel Sizes with SMALL Rear Sprocket & Mountain Drive disengaged

With Rear Hub 1st gear engaged

2nd gear

With Rear Hub 2nd gear engaged (direct drive)

3rd gear

With Rear Hub 3rd gear engaged