Here's something I found interesting by a gent named Chagzuki on another forum, if you are interested. Can't vouch for the accuracy and since it was dated from 2014 some of the parts may be different now, especially brake levers and the new cranks with replaceable chain ring.
chagzuki
Brompton weights listing
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on: January 31, 2012, 04:49:59 pm »
I reckon it'd be useful to have a full list of weights for Brompton parts so I figured I'd start with what I know and people can contribute to it over time. These are a mix of official weights and my own, don't know which are which unfortunately. Units are grams, obviously
Fork:
steel: 565
titanium: 350
Rear Frame:
steel: 755g
ti: 468g
Stem:
M: 806
S: 866
P: 602
Headset:
steel: 165
aluminium: 120
Handlebar:
M: 282
S: 132
P:
Brake Lever (single): 75
Seat Post:
standard, steel: 397
Pentaclip: 100
Saddle:
post-2009: 385
Crankset:
left arm: 190
44T right side: 288
44T chainguard: 57
Bottom Bracket (inc. crank bolts): 279
Chain:
SRAM PC1, 96 links: 280
Pedals:
Folding Pedal:
pedal: 240
bolt, steel: 41
washer: 8
Alloy, non-folding: 119
Front Hub:
standard: 158
superlight: 108
Tyres:
Brompton yellow Label: 240
Eazy wheel (not including fixings): 30
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