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  1. #1
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    My Mercton Fixie: Almost there!

    Just the front Pantour wheelbuild to do, hampered by sourcing spokes that were too small — Gah!;

    Anyhoo - a sneak peek for those of you that recall my many mentions of this project since getting the Merc in June.
    Still to fit - brake lever, brake cable, pedals [coming monday I hope] then off I go!




    Partlist:
    Merc frame, bottom-bracket, clamps, tensioner, headset
    Brompton S-type stem, Titanium forks, rear triangle and seatpost; pentaclip saddle-bracket, dual-pull brake calipers.
    Birdy suspension elastomer
    Phil Wood 32h Kierin (110mm OLN) track hub with 12 tooth sprocket and lockring
    Pantour 32h suspension hub
    Velocity Aeroheat 32 black anodised machined 349 ISO rims
    Schwalbe Stelvio ISO 349 foldable slick tyres
    Brooks B17-titanium (butchered)
    Campagnolo Carbon cranks w 53t chainring
    Ergon grips/bar ends, shortened straight alloy bars
    Custom rollers off Ebay UK (butchered rollerblade wheels)
    Various Ti nuts and bolts

    More pics when finished next week...
    Last edited by LittlePixel; 11-24-07 at 09:42 PM.

  2. #2
    To fold or not to fold?
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    drools
    foldingbikes.wikispaces.com - help create the ultimate folding bike community resource

  3. #3
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    Is that a prancing stallion decal on the frame?

  4. #4
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by delwong View Post
    Is that a prancing stallion decal on the frame?
    Well spotted - it's actually just photoshopped on for now but definitely considering it - it goes so well with the red frame! (checks ebay for wee enameled ferrari badges)...

  5. #5
    Car free since 1995 pm124's Avatar
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    Verrry nice. I like the 16 spoke wheel. I don't think anyone has gone with the Velocity rims that you can drill yourself, but I thought about it when building my current wheels. Since I tour on them, I went for the full 32 spokes, but that makes it the equivalent of what? A 64 spoke 700cc wheel?

  6. #6
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Drilling yer' own must take complicated maths to get it right!
    I suppose I should get around to finding a good method to seal the empty holes - anyone got any tried and tested fixes for that? (beyond black duck tape )
    Thanks for the kind words - really itching to get it finished now and see if it will work as a fixie with a chain-tensioner...

  7. #7
    Señor Mambo
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    Does it still fold?

  8. #8
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by spambait11 View Post
    Does it still fold?
    Yup - how well it works 'fixed' is another matter to be seen once the wheel is on... If not I can always spin on a freewheel.

  9. #9
    jur
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    Quote Originally Posted by LittlePixel View Post
    I suppose I should get around to finding a good method to seal the empty holes - anyone got any tried and tested fixes for that? (beyond black duck tape )
    To my pleasant surprise the tape is holding up very well - no loss so far.

    The spokes look very thick...?
    My folding bike photo essays www.dekter.net/

  10. #10
    jur
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    Where did you get the frame?
    My folding bike photo essays www.dekter.net/

  11. #11
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    Velocity Veloplugs

    Nice job, and a look at the Velocity site shows their Veloplugs, which suit your spare hole problem on the inside.

    http://www.velocitywheels.com/default.asp?contentID=555
    http://www.fixedgeargallery.com/revi...city/veloplugs

  12. #12
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by jur View Post
    To my pleasant surprise the tape is holding up very well - no loss so far.

    The spokes look very thick...?
    I think that's more to do with the way I've removed it from the background in the photo; They are normal 14g stainless spokes - admittedly not butted...

    Got the 'frame' as a whole Merc bike - they sell them new one at a time on UK ebay. I have a large box full of spares now should I want to rebuild it Mercstyle.

  13. #13
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by bangkok View Post
    Nice job, and a look at the Velocity site shows their Veloplugs, which suit your spare hole problem on the inside.

    http://www.velocitywheels.com/default.asp?contentID=555
    http://www.fixedgeargallery.com/revi...city/veloplugs
    Thanks for the links - they look just the thing!
    And a European stockist too (hopefully)
    Veloplug.com
    Last edited by LittlePixel; 11-24-07 at 09:43 PM.

  14. #14
    jur
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    I'm curious - what is the seat post diameter?
    My folding bike photo essays www.dekter.net/

  15. #15
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    It's the standard Brompton size - coming in at 32mm
    Are you wondering about getting a Ti post for one of your ponys?

  16. #16
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    chain tensioner on a fixed gear?

  17. #17
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    Quote Originally Posted by makeinu View Post
    chain tensioner on a fixed gear?
    Maybe because the rear triangle pivot point is too far away from the crank axle, which can lead to a loose chain when the rear triangle is folding position

  18. #18
    Bicycling Gnome
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    Very stylish Pixel. Nice work and unique. You have a talent for seeing how to make a nice bike out of an ordinary one.

    Is that the standard Merc plastic chain tensioner? If so dump it and buy the aluminium one from Anita's ebay shop for £12. The plastic one is pants. I broke three of them and my mate broke one in his first twenty miles. It is by far and away the least relibale item on the Merc. The rest of the stuff is OK. The alu tensioner is a good item, but best keep a spare screw for the inner jockey wheel. I bent one while hammering my bike over bumps. The aluminium item won't break like the plastic one does, but when the chain gets well out of order on bumps and the rider keeps up the pedaling pressure, something will give - its the jockey bolt on the metal tensioner, or the tensioner itself on the plastic one.


    And to makeinu - Pokkuhlag is right. As you fold the rear triangle right under, the chain becomes about two inches too loose.
    “Get a bicycle. You will not regret it, if you live." - Mark Twain

  19. #19
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    Quote Originally Posted by EvilV View Post
    Is that the standard Merc plastic chain tensioner? If so dump it and buy the aluminium one from Anita's ebay shop for £12.
    Where is Anita's ebay shop? I can't seem to find it.

  20. #20
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by pokkuhlag View Post
    Maybe because the rear triangle pivot point is too far away from the crank axle, which can lead to a loose chain when the rear triangle is folding position
    Yes - ideally it would be without but it would drop the chain all the time. The chain slackens by 2-3 inches when you fold the triangle under itself so this is really the only option besides finding a way to secure the slack chain some other way when folded.

  21. #21
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by EvilV View Post
    Very stylish Pixel. Nice work and unique. You have a talent for seeing how to make a nice bike out of an ordinary one.
    Thanks man! I'm a sucker for aesthetics - they look a lot nicer with no cables going to the rear... I think I'm a minimalist at heart.

    Quote Originally Posted by EvilV View Post
    Is that the standard Merc plastic chain tensioner?
    It is but I have an alloy one already on order - forgot to mention that. Yes - I recalled your previous posts on the subject and it does indeed seem a little flimsy especially for my use. Hopefully it will arrive as quickly as the bike did; @makeinu - for Merc parts on ebay search for username 123maddy.

    Quote Originally Posted by EvilV View Post
    The alu tensioner is a good item, but best keep a spare screw for the inner jockey wheel. I bent one while hammering my bike over bumps. The aluminium item won't break like the plastic one does, but when the chain gets well out of order on bumps and the rider keeps up the pedaling pressure, something will give - its the jockey bolt on the metal tensioner, or the tensioner itself on the plastic one.
    Thanks for the sage! Hope i can get a good chainline; to me these are the inherant flaw with the frame - if only there was a way they could get the rear to hinge around the same centre-point as the cranks then the tension would never drop and it'd be a more reliable system...

  22. #22
    Life in Mono
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    Great Stuff pixel !!
    Q's ...
    did you buy a complete merc (and ditch the rear triangle etc. ?)...
    Were Brompton OK about selling just Ti triangle and forks ?
    For the ultimate minimal look how about some internal cable runs ?
    ... or ... I guess if rear is fixed ? ..then you only have a front brake cable -- but then, wont the chain tensioner allow 'overrun' ? (ie top chain run slackening when slowing) ??
    Looks like gearing may be 70"+ .. will this be OK for setting off and hilly bits --- (or did I remember comments about thighs like hams ).

    Anyway ... well done !! NV !

  23. #23
    Raleigh20 PugFixie, Merc LittlePixel's Avatar
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    Quote Originally Posted by Simple Simon View Post
    Did you buy a complete merc (and ditch the rear triangle etc. ?)...
    I did yes. I have a box full of Merc bits if anyone wants anything...

    Quote Originally Posted by Simple Simon View Post
    Were Brompton OK about selling just Ti triangle and forks?
    Didn't need to worry them as SJS Cycles will sell you any part you can think of with no questions asked...

    Quote Originally Posted by Simple Simon View Post
    For the ultimate minimal look how about some internal cable runs?
    That sounds like quite a job - I'd fear of drilling the alloy. Maybe on a steel one...

    Quote Originally Posted by Simple Simon View Post
    ... or ... I guess if rear is fixed?
    It is - or that's the plan.

    Quote Originally Posted by Simple Simon View Post
    ...but then, wont the chain tensioner allow 'overrun' ? (ie topchain run slackening when slowing)??
    This is what remains to be seen... I've a good feeling about it but know it's a gamble. If it's not workable I'll be just as happy to spin on a freewheel. Might not bother with rear brakes - I never use them anyway.

    Quote Originally Posted by Simple Simon View Post
    Looks like gearing may be 70"+
    75" by my calcs (53—>12)

    Quote Originally Posted by Simple Simon View Post
    will this be OK for setting off and hilly bits --- (or did I remember comments about thighs like hams ).
    Perhaps not - that's just the chainring that came with the cranks. If it's too much I may go down to 52t or lower. I usually ride about 72" on my Twenty and Peugeot so I guess I have to suck it and see. It'll be FAST if it does all work though [grins]

    Quote Originally Posted by Simple Simon View Post
    Anyway ... well done !! NV !
    Sweet - thanks!

  24. #24
    Bicycling Gnome
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    Quote Originally Posted by LittlePixel View Post
    if only there was a way they could get the rear to hinge around the same centre-point as the cranks then the tension would never drop and it'd be a more reliable system...
    Yes - you're right. I look at the DT Mini and admire the simple drive, sans tensioner. It's is the only fail point I've found with the bike - oh, and a few rear spokes. I don't know if Brompton plastic tensioners break much, but the original plastic Merc one does. Grace Gallant who make the Merc, now supply new models with the metal part as standard.
    Last edited by EvilV; 11-25-07 at 01:32 PM.
    “Get a bicycle. You will not regret it, if you live." - Mark Twain

  25. #25
    The Legitimiser Sammyboy's Avatar
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    I will be extremely interested to hear whether or not the chain tensioner dies under backpedalling. Cool project!

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