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Does anyone know the weights for the standard frame, fork and rear triangle

Discussion in 'Folding Bikes' started by 12boy, 31 Dec 2016.

  1. 12boy

    12boy Well-Known Member

    Casper WY USA
    With all the Ti variations available, i.e. seat posts, pedals,bolts rear triangles and forks I have to wonder if the basic main frame would not be a better way to lose weight. The Brompton Builder shows you in real time how much you lose or gain by customizing the bike in different ways, which is interesting and good, but I cannot find how much those basic components weigh. I am curious as to how much weight could be lost by simply going to a high quality material like butted Columbus or Reynolds 725 tubing.
  2. chriscross1966

    chriscross1966 Well-Known Member

    Remember that normal (penny-penny) bikes buit with those materials depend on triangulation for stiffness.... all the BRompton has is a little gusset tube at the seatpost stem.....
  3. Grant Fondo

    Grant Fondo Parks, Hotels and Palaces, Europe Endless.

    I picked up a £4 grand Cervelo frame and forks in a local bike shop...weighed about as much as new 5 quid note!!
    chriscross1966 likes this.
  4. OP

    12boy Well-Known Member

    Casper WY USA
    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.
    Brompton weights listing
    « 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

    steel: 565
    titanium: 350

    Rear Frame:
    steel: 755g
    ti: 468g

    M: 806
    S: 866
    P: 602

    steel: 165
    aluminium: 120

    M: 282
    S: 132

    Brake Lever (single): 75

    Seat Post:
    standard, steel: 397

    Pentaclip: 100

    post-2009: 385

    left arm: 190
    44T right side: 288
    44T chainguard: 57

    Bottom Bracket (inc. crank bolts): 279

    SRAM PC1, 96 links: 280

    Folding Pedal:
    pedal: 240
    bolt, steel: 41
    washer: 8

    Alloy, non-folding: 119

    Front Hub:
    standard: 158
    superlight: 108

    Brompton yellow Label: 240

    Eazy wheel (not including fixings): 30

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  5. chris folder

    chris folder Well-Known Member

    Hi :hello:i found this weight guide to guy had one reply from it. the bottom bracket on it what part would you say that is? The back triangle?
  6. OP

    12boy Well-Known Member

    Casper WY USA
    The bottom bracket is the spindle and bearings that attach to the crank arms and sometimes can mean that part of a bike that houses the spindle and bearings.
  7. chriscross1966

    chriscross1966 Well-Known Member

    Yes, if you are talking about the frame then it is the tube (threaded on trad frames) that the bearings and crank axle sit in, if you are talking about the group set then it is the bearings etc that the pedal cranks run on