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  1. #1
    Member bike.gang.uk's Avatar
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    Can it be simpler than this? (Brompton)

    A 2 speeds fully functional brommie.

    3.jpg2.jpg1.jpg
    Last edited by bike.gang.uk; 07-21-14 at 09:01 AM.

  2. #2
    Senior Member Ed in Toronto's Avatar
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    Well,... could be a bit simpler, remove the front carrier block, the fenders, and the rear reflector.

  3. #3
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    Not to mention the saddle bag+cover

    Still, cool bike.

  4. #4
    Senior Member blakcloud's Avatar
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    The bike looks great. I especially like the handlebar set up, looks so clean. Nice work.

  5. #5
    Member bike.gang.uk's Avatar
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    I second removal of the somewhat ugly carrier block.

  6. #6
    Senior Member smallwheeler's Avatar
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    a brompton with a kick brake...

    deliver us from evil...

  7. #7
    Member bike.gang.uk's Avatar
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    You spot it! coaster brake to remove the brake lever, cables, brake pad ...
    Last edited by bike.gang.uk; 07-21-14 at 09:15 AM.

  8. #8
    coprolite fietsbob's Avatar
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    Brake delay as the chain tensioner moves up ?
    I note: didnt take out, links [half link] to push it up to be tensioned on the bottom ,
    and so the spring only kicks in winding the tensioner when you fold it..

    You are obviously a flatlander .. in Tyneside.

    Weight in the front bag makes the low trail handling better .. But to each their own... YMMV.
    Last edited by fietsbob; 07-21-14 at 10:08 AM.

  9. #9
    PatronSaintOfDiscBrakes dynaryder's Avatar
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    Simpler? You mean how you have to plan your crank position for folding and your stopping since there's no front brake(70% of your braking gone)?

    I would have forgone the coaster and lived with ugly brakes.

    C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport/Qualifier,Brompton S6L,Dahon Speed Pro TT

  10. #10
    coprolite fietsbob's Avatar
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    Greenspeed , Australian Brompton importing-distributor

    Re Machined a Sturmey Archer Drum brake to fit in the 74mm Fork

    to cleverly add a front brake back on.
    Last edited by fietsbob; 07-21-14 at 10:34 PM.

  11. #11
    Member bike.gang.uk's Avatar
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    I believe they used https://www.sram.com/sram/urban/products/automatix
    And you are right, for safety reason, front brake should be there. Folding is the same, mod the hub to fit the frame.
    Moulton has something similar. I wonder how well the belt drive works.



  12. #12
    Senior Member ThorUSA's Avatar
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    belt drive works well
    HOWEVER as they are designed for "big" bikes .... the rear sprocket is somewhat big with 20 or more tooth
    the front one needs to be SUBSTANCEABLE bigger than the picture above .... and those really big front chaindrives are not available ...
    so u have a very cool bike .. but cant go any faster than 10 miles per hour ...( well a little but not much )
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

  13. #13
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    Quote Originally Posted by ThorUSA View Post
    belt drive works well
    HOWEVER as they are designed for "big" bikes .... the rear sprocket is somewhat big with 20 or more tooth
    the front one needs to be SUBSTANCEABLE bigger than the picture above .... and those really big front chaindrives are not available ...
    so u have a very cool bike .. but cant go any faster than 10 miles per hour ...( well a little but not much )
    Don't let pictures mess with the facts .. the TSR-2 belt drive above runs a 67/25 with a g/i of 50 to 68 .. so with a mild cadence of 90 rpm you have a top speed of just over 18 mph .. not bad, spin 100 and you are over 20 mph .. on the shelf I have an 80t and a 100t .. my personal everyday runabout TSR-5 runs an 80/25 for a 37/93 gi ... and so it goes ..

  14. #14
    Senior Member ThorUSA's Avatar
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    Quote Originally Posted by BruceMetras View Post
    Don't let pictures mess with the facts .. the TSR-2 belt drive above runs a 67/25 with a g/i of 50 to 68 .. so with a mild cadence of 90 rpm you have a top speed of just over 18 mph .. not bad, spin 100 and you are over 20 mph .. on the shelf I have an 80t and a 100t .. my personal everyday runabout TSR-5 runs an 80/25 for a 37/93 gi ... and so it goes ..
    if thats a 60 than the crank arms are 300 mm long :-0
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

  15. #15
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    Quote Originally Posted by ThorUSA View Post
    if thats a 60 than the crank arms are 300 mm long :-0
    That's a 67t .. and crank arms are 170mm .. truth!!

  16. #16
    Senior Member ThorUSA's Avatar
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    :-) I believe you no prob..
    that is a gorgeous bike for sure
    need to get myself back into that belt drive thingy... and see what can be done on Dahons which makes sense, there is something real magic about the silent drive of a good belt system
    Having fun selling Terns and Dahons for a living. My personal website is also my business website, same as my profile name, therefore no link given to follow forum rules.

  17. #17
    Senior Member
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    What shop is this? in byker? I work at recyke ya bike, be nice to pop in and have a look!

  18. #18
    Senior Member
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    i think that's someone personal broomie and probably gone by now. It's waaay to custom to be something the shop sells.

  19. #19
    coprolite fietsbob's Avatar
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    That's a 67t
    Gates belt is Not 1/2" pitch , like a Bike chain, I suppose ..

    the (disallowed)10 mm pitch track chains , back in the day,resulted in smaller cog-chainrings
    with the same, tooth count, gear ratios..

  20. #20
    Senior Member smallwheeler's Avatar
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    Quote Originally Posted by BruceMetras View Post
    That's a 67t .. and crank arms are 170mm .. truth!!
    this is a bit confusing because the belt teeth are on 1/4" centers instead of the conventional 1/2", right?

    a 67t belt chain ring is basically equivalent to a 34t conventional chain-drive ring.

  21. #21
    Senior Member
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    Quote Originally Posted by Azreal911 View Post
    i think that's someone personal broomie and probably gone by now. It's waaay to custom to be something the shop sells.
    We have shops in the UK that will do custom bromptons and moultons and a few that do terns and dahon - Fudges CyclesOnline - Folding Bikes Custom Builds. or My catalogue - Items - www.foldingbike.biz=

  22. #22
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