Brompton factory build:
A Line
C Line Utility
C Line 2-speed
C Line Explore
C Line 12-speed
G Line 8-speed
G Line Electric
P Line 4-speed
P Line 12-speed
T Line 1-speed
T Line 4-speed
T Line 12-speed
BWR 6-speed
BSR 3-speed
SRAM 6-speed
SRAM 3-speed
SA 3-speed
SA 5-speed
2-speed
Single-speed
Brompton-compatible data only:
Options:
Chainring:
Factory sizes are 54/50/44 teeth (+8%/standard/-12%)
Tyre:
Brompton HP: 16×1⅜ - ETRTO 37-349
Continental Contact Urban: 16×1.35 - ETRTO 35-349
Brompton Schwalbe Almotion: 16×1.35 - ETRTO 35-349
Schwalbe One: 16×1.35 - ETRTO 35-349
Marathon: 16×1.35 - ETRTO 35-349
Marathon Plus: 16×1.35 - ETRTO 35-349
Marathon Racer: 16×1.35 - ETRTO 35-349
Marathon Racer Tanwall: 16×1.35 - ETRTO 35-349
Kojak: 16×1.25 - ETRTO 32-349
Stelvio: 16×1⅛ - ETRTO 28-349
G-One Allround: 20×2.0 - ETRTO 54-406
Continental Contact Urban: 20×2.0 - ETRTO 54-406
Manufactured by Schwalbe
Hub:
Brompton 4-speed cassette
BWR (Brompton Wide Range)
BSR (Brompton Standard Range)
Sachs/SRAM 3-speed
Sturmey Archer S2 Kick Shift
Sturmey Archer 3-speed
Sturmey Archer 5-speed
Sturmey Archer SRF5(w)
Sturmey Archer XRF8(w)
Shimano Nexus 8
Shimano Alfine 8-speed
Shimano Alfine 11-speed
Rohloff Speedhub
Kindernay XIV 14-speed
No internal gears
Same ratios as most SA 3-speeds
Schlumpf:
Direct Drive
Mountain-Drive
Speed-Drive
High-Speed-Drive
Units:
Gear Inches
Metres Development
Speed - MPH
Speed - KPH
Gear Inches
Hub Ratios
75%
100%
133%
Rear sprocket:
42.2
56.2
74.9
Range: 178%