• Butchered Ti Brooks B17 saddle
  • Ergon bar ends
  • Pantour™ suspension hub
  • Birdy 'Green' suspension elastomer
  • Camagnolo Centaur carbon cranks
  • Schwalbe Stelvio slick tyres; Velocity Aeroheat 349 rims
  • Phil Wood 'Keirin' track hub (fixed gear transmission)
  • Look! No horrible dangly cables!

My lightweight Brompton fixed gear bike

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My lightweight Brompton with alloy clone frame, Phil Wood fixed-gear transmission, Butchered Brooks B17 saddle, carbon Campagnolo Centaur cranks, hand-built 16 spoke Velocity Aeroheat wheels and some choice Ti parts. It weighs only 8.8kg - my own wee pocket rocket.

_2.4.2_, ibikenz, elkue, foka kytutr, and 94 other people added this photo to their favorites.

View 18 more comments

  1. historicist 73 months ago | reply

    ~on genuine Bromptons at least (I don't have any experience with the copies), it's quite normal to have a bit of play in the rear triangle, maybe a millimeter or so~

  2. Littlepixel™ 73 months ago | reply

    Ah cool - it's probably ok then. The bolts are in nice and tight so it's likely just normal tolerence. I fixed up a better qr on the seatpost the other day so the clip for the rear triangle is a lot better fitting and the movement is pretty much gone now anyway.

  3. Fajita. [deleted] 67 months ago | reply

    i think this bike is really fucking awesome

  4. Ray J. 67 months ago | reply

    Or really lame... Did those phil wood hubs cost more than your original bike? You should send a picture of it to bikesnobnyc.blogspot.com. Fantastic fodder for his site.

  5. historicist 67 months ago | reply

    ~ I think the reason why he has a Phil Wood track hub is because of the narrow spacing on the back, otherwise what? Finding a Japanese Keirin hub in England, or using some track hub from the early 60s? ~

  6. Littlepixel™ 67 months ago | reply

    @ Ray J and Historicist: Yep - the Phil Wood hub was 'spensive (not more than the bike - only used Phil on the rear and cost about £100 GBP) and was chosen exactly for the reason Historicist offers - spacing on a Brompton is really narrow at 110mm OLN so there are very few track hubs that would fit in this case beyond making a BMX suicide hb which I wanted to avoid.

  7. eldelacajita 66 months ago | reply

    Really nice, what you did to that Brompton! Every detail!

  8. Clare Chick 50 months ago | reply

    You now count as my official Brompton expert. Please, please, can you tell me how to use the gears?! I have a six-speed S-type for which I took delivery this week. I can't figure out the gears at all and have to get off and push up anything steeper than a speed bump. Folk are laughing at me...and I don't blame them. I have got the folding and unfolding nailed (I made myself do it 20 times a day before risking taking it to work), so if I can just get the hang of the gears, I can start loving my bike!

  9. Littlepixel™ 50 months ago | reply

    @Clare Chick Never actually used a six speed Brompton but I do have a basic idea of how they work; the six gears are actually 3 gears in the hub of the rear wheel - controlled by one lever on the bars, and 2 cogs on the outside of the hub controlled by the other. Gears are pretty hard to describe, but the basic idea is you change gears inside the hub and switch from one cog to another to then extend the 'range' of those gears in the hub so you can change down and go up hills, or change up and speed along. A lot of bikes would just have six gears all in the hub, or six cogs but Brompton have opted for this arrangement for reasons of space and durability, even if it makes it all a bit hard to understand. When you're riding, you should be able to shift the gears in the hub without stopping pedalling. You should be able to work out which lever controls which gear mechanism by looking at the bike when stationary and seeing what moves when you move a lever. If the little chain that goes inside the axle moves, then that lever controls the internal hub gears, if the sprung arm on the outside that guides the chain through the cogs moves, then that is the other. Can't really say more than that - but sounds like you're someone that likes to practice so I'm sure you'll get the knack.

  10. Clare Chick 50 months ago | reply

    Thank-you Littlepixel! I think that makes sense...it's a steep learning curve. Thank-you for taking so much trouble to explain - that is a lot more useful than the instruction booklet that came with the bike.

  11. N13 E100 47 months ago | reply

    Hi Littlepixel, I have really enjoyed reading about your bike :-)

    About 4 years ago I bought the first S2L-X Brompton in Denmark, and striped it down just like you. One of the only thing that wasn't changed was the rear wheel, because I couldn't find a replacement hub.

    For the last few years I have been thinking about building a fixed gear bike, but never thought it possible with my Brompton - before reading your post. Thanks!

  12. N13 E100 46 months ago | reply

    Hi Littlepixel. I have added a few pictures of my own 7.8 kg Brompton, please have a look :-)

    Right now I'm dreaming about buying a new rear wheel with a Phil Wood hub, but need a bit of saving first.

  13. crazykissyou 46 months ago | reply

    is it fixed gear ???

  14. Littlepixel™ 46 months ago | reply

    @crazykissyou The clue is in the image title!
    [yes it is!]

    It runs a phil wood keirin track hub and a brompton 2 speed tensioner so that the chain doesn't fall off when you fold it or the rear flexes dramatically on a bump.

    In truth it's really only a semi-fixie. It is fixed, but in practice, because of the folding rear triangle it isn't as sturdy and bombproof as a hardtailed rear triangle, so braking is possible with your legs, but more extreme moves like skids aren't so easy, at least for a white-belt fixie rider like myself.

  15. crazykissyou 45 months ago | reply

    hello .pls send me email fixgear@163.com
    i am addicted in fixed gear

  16. Littlepixel™ 45 months ago | reply

    @crazykissyou. What shall I say in my email?

  17. FITH - Fire in the Hole 23 months ago | reply

    I just want to introduce some new stuff to you.

  18. Finger Jockey 19 months ago | reply

    Hey, I am facing the idea of having to retire my track bike (for train commuting reasons), and was wondering if this conversion was possible, and so glad that you've proved it is, and so stylish too! Can you give me an idea of the cost of the whole project, or is it best not to know?! Cheers!

  19. Littlepixel™ 19 months ago | reply

    Best not to know if you're starting without a Brompton, but if you already have one it's not so bad. Possible is the word - it's not easy as you have to keep the chain-slack so in retrospect I'd say a rear brake and singlespeed (or a coaster hub perhaps) is maybe better than fixed as it does work but it's not quite the solid experience you get with a solid-rear-ended bike.

  20. Finger Jockey 19 months ago | reply

    Thanks for the reply. My main reason for wanting to do the fixed conversion was mostly because I wanted to retain the fixed feeling, but like you say, it's not going to be the same experience. There is a Merc on eBay at the mo, so am still tempted to try this.

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