Chain Length

The list below states the required chain length for each chain ring / sprocket choice. 


44t Chain Ring

12t - 96 link
13t - 96 link
14t - 96 link 
13/15t - 98 link 
12/16t - 98 link
13/16t - 98 link

50t Chain Ring

12t - 98 link
13t - 98 link
13/15t - 100 link 
12/16t - 100 link
13/16t - 100 link

54t Chain Ring

12t - 100 link
13t - 100 link
13/15t - 102 link
12/16t - 102 link
13/16t - 102 link

Cable Lengths

Full set lengths of cables for long wheel base bicycles.

Pre 2017 Shifters
Left 2spd DR:

S - 1145mm outer, 1269mm inner
H - 1283mm outer, 1362mm inner 
M - 1187 outer, 1309mm inner
P - 1283mm outer, 1362mm inner

Right 3spd Hub Gear:

S - 1250 outer, 1411mm inner
H - 1360mm outer, 1521mm inner
M - 1302mm outer, 1463mm inner
P - 1344mm outer, 1505mm inner 

2017+ Integrated Shifters
Left 2spd DR:

S - 1015mm outer, 1379mm inner
H - 1120mm outer, 1206mm inner 
M - 1072mm outer, 1155mm inner
P - 1110mm outer, 1196mm inner

Right 3spd Hub Gear:

S - 1220mm outer, 1379mm inner
H - 1320mm outer, 1479mm inner
M - 1265mm outer, 1424mm inner
P - 1291mm outer, 1450mm inner

Brake: - 30deg/alu levers
Front:

S - 332mm / 485mm outer, 1050mm inner
H - 440mm / 485mm outer, 1050mm inner
M - 366mm / 485mm outer, 1050mm inner
P - 389mm / 485mm outer, 1050mm inner

Rear:

S - 1230mm outer, 1493mm inner
H - 1355mm outer, 1493mm inner
M - 1290mm outer, 1493mm inner
P - 1319mm outer, 1493mm inner

Brompton Component Weights

Below I have compiled a list of the standard factory components and their weights:

- NB. please let me know if you think one needs updating or something is missing!

Main frame - 2000grams             (mainframe/headtube section,hinge bushes/spindle and seat sleeve included)

Rear Triangle - 755 grams
Rear Triangle Ti - 461 grams

Fork 2017 -
Fork 2017 Ti - 285 grams
Fork 2018 - 543 grams 
Fork 2018 Ti

Stem S - 876 grams 
Stem P - 
Stem H - 919 grams
Stem M - 844 grams 

Stem H - Lower section - 317 grams 

Stem H - Upper section - 602 grams 

Stem bolt - 7 grams
Stem internal bolt + expander cone - 43 grams

Handlebar S - 133 grams
Handlebar H - low rise - 241 grams
Handlebar P - 470 grams 
Handlebar M - low rise - 241 grams
Handlebar catch - 27 grams

Brake lever - per lever 79 grams each, 158 grams pair 
Brake lever/shifter Left - 133 grams 
Brake lever/shifter Right - 155 grams 
Shifter pre 2017 Left 2spd + bell - 60 grams
Shifter pre 2017 Right 3spd - 52 grams 
Grip - 100mm foam - 14 grams 
Grip - 130mm foam - 
Grip - P type - 137 grams 
Grip pre 2018 foam - lock on - 55 grams 
Grip 2018 rubber - lock on - 
Headset - steel - 162 grams
Single Steel headset cup - 30 grams
Crown Race - 15 grams
Headset - alloy - 120 grams 

Front wheel -std - 650 grams
Front wheel - superlight  - 535 grams
Front hub std -
Front hub superlight - 
Rear hub 2spd - 312 grams
Rear hub BSR - 929 grams
Rear hub BWR - 940 grams
Rear wheel - BWR  - 1397 grams
Rear wheel - BSR - 1386 grams
Rear wheel - 2spd - 
                                                                     - all wheel weights do NOT include fittings or rim tapes. -
Front Wheel nut (single) - 8 grams
Front Wheel axle tab washer - (single) - Right - 3 grams 

Rim double wall - 330 grams

Rim - single wall - 
BSR/BWR indicator chain -  10 grams 

2/6spd Chain Tensioner - 148 grams 
2/6spd idler wheel + fittings - 20 grams
1/3spd Chain Tensioner - 131 grams
1/2spd Tensioner Nut/washer - 11 grams 
3/6spd Tensioner Nut/washer - 20 grams
2/6spd Idler wheel + fittings - 20 grams 

Kojak folding tyre - 182/185 grams
Kojak wired tyre - 230 grams
Schwalbe One 35mm folding tyre - 
Brompton Kevlar tyre - 256 grams
Schwalbe Marathon Racer - 
Schwalbe Marathon - 420 grams
Schwalbe Marathon Plus - 480 grams 
Schwalbe Winter - 465 grams
Inner tube - 97 grams

Front mudguard blade - 44 grams
Front mudguard stay + fittings - steel - 63 grams  
Front mudguard stay - Ti - 
Front mudguard flap - 13 grams
Rear mudguard blade L - 63 grams
Rear mudguard blade R - 89 grams
Rear mudguard stays only - steel - 80 grams
Rear mudguard stay only - Ti - 
Rear mudguard roller wheel - 
Front left mudguard stay tab washer - 6 grams 

Chainset 44t - 608 grams

Chainset 50t - 641 grams

Chainset 54t - 672 grams
Chainset 50t - fixed - 543 grams

Cranks arms only - 487 grams 

Crank bolt (single) - 13 grams 

Chain ring 44t - 89 grams

Chain ring 50t - 120 grams

Chain ring 54t - 150 grams
Chain Ring Bolts - 22 grams

 - Chain ring weights include plastic bash guard 

Bashguard + screws 44t - 

Bashguard + screws 50t - 45 grams

Bashguard + screws 54t - 

Bottom bracket - 249 grams (FAG), 244 grams (Thun), 250 grams (old ISO)

Chain 96 link - 260 grams 

Chain 98 link - 266 grams 

Chain 100 link - 272 grams

Chain 102 link - 278 grams

 - Chain weights include a quick link as part of the link count

Sprocket (12 spline) 12t - 14 grams

Sprocket 13t (3spline) - 21 grams

Sprocket 14t - 
Sprocket (12 spline) 16t - 21 grams

Sprocket set 13/15t - 

Sprocket set 12/16t - 56 grams 

Sprocket set 13/16t - 57 grams 

Circlip - 4 grams 

Plastic Disc - 12 grams 

3spd sprocket spacer - 

2/6spd sprocket spacer - 4 grams

3spd BWR sprocket spacers -  

Front brake caliper - 2017 - 185 grams

Rear brake caliper - 2017 - 182 grams

Front brake caliper - 2018 - 188 grams
Rear brake caliper 2018 - 183 grams

Brake pad - pair - 2017 - 44 grams

Brake pad - pair - 2018 - 34 grams 
Stop disc - 29 grams 

Seat post - Standard - 412 grams

Seat post - Extended - 517 grams

Seat post - Telescopic - 706 grams

Telescopic lower - 440 grams 
Telescopic upper - 142 grams 
Telescopic Plastic insert - 8 grams
Telescopic quick release clamp/lever - 78 grams  
Seat post bung - 9 grams 

Pentaclip - 109 grams
Seat clamp + clip - 72 grams

Saddle - 345 grams

Saddle - wide - 

B17 - 560 grams

B17s - 

Pedal - Left folding - 286 grams 

Pedal - Right - 124 grams 

Hinge clamp screw (Inc. washer) - 32 grams

Hinge clamp plate - 20 grams

Suspension block - Soft - 24 grams
Suspension block - Firm - 33 grams
Suspension block - Firm 2018 - 30 grams
Suspension block fittings - 26 grams

Cateye front light mount - 51 grams

Front carrier block - 91 grams

Easy wheel - stock, single with fitting - 22 grams 

Toolkit - 170 grams 
Pump - 92 grams
Seatpost O ring - 2 grams 

Rear hinge spindle / bolts - 40.5 grams  
Pivot spindle 6.0 - 11 grams 
Pivot spindle 6.1 - 12 grams 

Cable Gatherer - 2 grams 
2017 DR cable spring set / anchorage - 24 grams