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  1. #26
    Bicycling Gnome
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    That mini looks like a stylish little 'pocket rocket' there Pinecone. Nice work.
    “Get a bicycle. You will not regret it, if you live." - Mark Twain

  2. #27
    rhm
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    Taking this thread is an excuse to show you the wallpaper in my office, here is a photo. If you look closely you'll also see my Downtube Mini in its current state. Modifications include:

    Fenders
    Nexus dynamo hub and lights
    Brooks saddle
    140 mm FMF crank with 38T chain ring, 19 T cog, Hebe Chainglider, and a new chain
    MKS folding pedals
    front tire is Schwalbe Big Apple, rear tire is Schwalbe Marathon

    ---Rudi
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  3. #28
    Bicycling Gnome
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    Love the saddle and chain guard. I'm starting to crave a mini.... I must stop this. I don't need another small wheeled bike, or any bike come to that.
    “Get a bicycle. You will not regret it, if you live." - Mark Twain

  4. #29
    Senior Member JosephLMonti's Avatar
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    Quote Originally Posted by rhm View Post
    Taking this thread is an excuse to show you the wallpaper in my office, here is a photo. If you look closely you'll also see my Downtube Mini in its current state. Modifications include:

    Fenders
    Nexus dynamo hub and lights
    Brooks saddle
    140 mm FMF crank with 38T chain ring, 19 T cog, Hebe Chainglider, and a new chain
    MKS folding pedals
    front tire is Schwalbe Big Apple, rear tire is Schwalbe Marathon

    ---Rudi
    Does the 38T chain ring n' 19T cog combo create gearing that is higher or lower than the stock gearing?

  5. #30
    rhm
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    Quote Originally Posted by JosephLMonti View Post
    Does the 38T chain ring n' 19T cog combo create gearing that is higher or lower than the stock gearing?
    Its virtually indistinguishable. By Sheldon Brown's gear calculator, the 19/38 combo gives you a range from
    26.7 to 82.1. OEM was a 23/46 or something, I don't remember exactly.

  6. #31
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    Hi
    This is Daigoro (from my favourite manga). Major modifications so far:
    -Original brakes are replaced by dual-ones – the rear brake is now more efficient than the original front brake. In winter you must have a good rear brake. I attached the rear brake with a metal plate to be able to fit it so that it wouldn’t bend when the brake is operated and to be able to fit the brake pad as close to the joint as possible. The front brake is also fitted on the rider’s side so as not to hinder with the folding. I will attach it a bit lower later with an adapter. Pads are original. I talked with an old bike mechanic, and he said that salmon coloured pads wear aluminium rims excessively. ??
    -Front fork, rear triangle and seat-tube are titanium painted black according to the instructions and material provided by a car paint company – the paint chips like hell – have to repaint soon. The weight saving was less than 1 kg, but front fork feels better now.
    -The straight handle-bar is fitted with a bar-adapter – the cables run through the short tube of bar-adapter. Bar-ends are fitted. Handle-bar is wider than the original, so bar-ends fit next to the front tyre when folded.
    -The seat is attached with an adapter made of aluminium bar-end – I’m a light-weight guy. Using the adapter the seat is raised about 3 cm and it can be further back – gives a better riding position.
    -Saddle is the original Merc’s but modified – 100g lighter and comfy. Nylon seat-cover is used.
    -Extra seat-clamp quick release is fitted around the seat-tube. When folded it is lifted near the saddle, when unfolded it is tightened above the original clamp. This has eliminated seat-post dropping completely.
    -The original plastic door-stopper rear suspension is replaced with a rubber shock-absorber used under motors etc. Aluminium cylinder is fitted to make the length proper.
    -Fenders are painted black and the rear one is attached so that when folded it just presses against the tyre – I don’t need to roll the bike folded. A patch of rubber is glued where the fender touches the ground when folded.
    -At the lower end of the seat-tube there is a plastic cone attached with a rubber band to a small wooden ball at other end of the tube under the seat. This eliminates dirt entering inside the frame tube when riding in foul weather, and dirt getting between the seat-tube and frame when folded and then unfolded again. The rubber band runs inside the seat-tube and it’s length is such that the cone is always pressed against the frame tube/unfolded or against the seat-tube/folded.
    -Rear tyre is Schwalbe Marathon Plus. In December I had 6 flats with Merc tyres. 5 with a tyre that had seen 2000 km, one with a brand new Merc tyre after 25 km ride – that was enough. While waiting for Schwalbe-tyre I bought a Brompton green tyre from LBS – no flats during 150 km. Communal authorities sand the bike-paths in Finland in winter for safety. The sand is grinded mechanically from rocks, the by-product is small nail-sharp and nail-shaped stones.
    -I stripped the front pannier, modified the skeleton so that it’s now about 20 cm wide and attached rubber bands from the original rack on it. Skeleton fits inside my rucksack. If there is a lot to carry, I take it out, attach rucksack on it with the rubber bands and put in on the bike. Supporting rods will be welded on both sides of the skeleton.
    -Pedals will be changed, gears modified etc.
    Sorry this message came so long.
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  7. #32
    Eschew Obfuscation SesameCrunch's Avatar
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    Maranen:

    You have made some very clever mods to the Merc. I may "borrow" the extra seat post clamp idea. I have problems with the post slipping also.

    On the seat post adaptor to move the seat back - is that the part that Brompton sells? I am interested in moving the seat backwards a bit too, for more comfort.

    Nice work!

  8. #33
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    Hi SesameCrunch
    Thanks for the compliment. Yes, the seat is attached with the Brompton penta-clip - very nice piece of work. This mod increases the folded size a little - but you can remove the seat with one hexa screw, if there is need for smaller size.
    Last edited by maranen; 03-10-08 at 09:42 AM.

  9. #34
    Bicycling Gnome
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    Quote Originally Posted by maranen View Post
    Hi
    This is Daigoro (from my favourite manga). Major modifications so far:
    Wow - that's a heavily modified Merc there Maranan. I need to soak up these changes and think about them, but I'm wondering how you managed to get all those punctures with the merc tyres. They must be a different type to the ones I got, since at 2840 miles, I just got my first puncture TODAY!!! I ran over some horrible thorns on an off road track and pricked the front tube. After walking to the road, I managed to still ride it by pumping it regularly and riding slowly on a soft tyre - a good thing since I was nine and a half miles from home when it happened. I can't complain, I have led a charmed life with these tyres so far.

    I like the new handlebars and the new brakes. Mine are acceptable now, but better would be good, so I'm going to study yours. Are they Brompton ones?

  10. #35
    Bicycling Gnome
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    Quote Originally Posted by SesameCrunch View Post
    Maranen:

    You have made some very clever mods to the Merc. I may "borrow" the extra seat post clamp idea. I have problems with the post slipping also.
    I used to have that problem but solved it by rigorous degreasing and tightening the clamp a bit. It does take a bit of force to push it over now, but it keeps my 168 pound backside at a fixed height above the road now, unlike before.

  11. #36
    3 year old with credit cookie addict's Avatar
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    I took a Dahon Helos and made it into a 9-speed Travel bike/commuting machine. I put on a Zorin Seat Post pump, 9-Speed Dura-ace shifters, bull horns (later replaced by flipped and chopped drop bars), Wireless cycling computer, Leather-based bar tape, Travel Agent brake boosters, SPD road pedals, 11-26 Custom Dura-Ace cassette, Dura-Ace chain, Specialized Avatar 143 saddle.

    I have pictures and a full write up at: http://www.addictedtocookies.com/soapboxfoldingbike.htm

    The bike has been my daily ride for over a year and I couldn't be happier with it.

  12. #37
    Hauja
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    Mods to Dahon Boardwalk 6 .

    Mods to my boardwalk 6 include.Front chainring to 60T ,Lepper 65 leather saddle with springs ,Gel grips & cloth handlebar tape,friction shifter instead of gripshift,better tires. I changed the freewheel to 13 -30.wine corks in bar ends and a cork in the bottom of the seatpost.
    Last edited by James H Haury; 03-10-08 at 07:40 PM. Reason: clarity & completeness

  13. #38
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Quote Originally Posted by sahadev View Post
    Have you sourced a new fork yet? I am looking for one myself. I am leaning towards the Sun EZ Sport recumbent fork, but haven't seriously searched or priced one yet. Another BF member used one on his R20 rebuild.
    I just ordered a couple of Suntour Suspension forks to see how they might work out... I will let you know how they work.

    Started on another Phillip's Twenty tonight... it is the identical twin to my other '73 Phillip's and started out the day as being 100% stock.

    I removed the stock fenders and chain guard and replaced the bars with some drops and nice Weinmann levers... I figure this one needs 451's and when I get the crank done, it will be a fixed gear.

    Until then, I can lace up a 406 to the SA hub and fit a new wheel to the front.


  14. #39
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    Quote Originally Posted by EvilV View Post
    Wow - that's a heavily modified Merc there Maranan.
    Almost all mods are for practical reasons, except the bell - being able to operate it with my little finger makes me feel sophisticated.
    Quote Originally Posted by EvilV View Post
    I'm wondering how you managed to get all those punctures with the merc tyres.
    I believe we have the same tyres. If you look at the profile of the tyre, you see that those grooves can pick a small - about 1mm diameter - sharp stone and on every revolution it goes deeper and deeper. But of course there might be a lot of quality variation with cheap tyres.[/quote]
    Quote Originally Posted by EvilV View Post
    new handlebars and the new brakes. Mine are acceptable now, but better would be good, so I'm going to study yours. Are they Brompton ones?
    The brakes are not Brompton's - I found them at LBS, they are an old model, got them cheaply.
    Last edited by maranen; 03-11-08 at 09:09 AM.

  15. #40
    rhm
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    multimodal commuter rhm's Avatar
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    Quote Originally Posted by maranen View Post
    -At the lower end of the seat-tube there is a plastic cone attached with a rubber band to a small wooden ball at other end of the tube under the seat. This eliminates dirt entering inside the frame tube when riding in foul weather, and dirt getting between the seat-tube and frame when folded and then unfolded again. The rubber band runs inside the seat-tube and it’s length is such that the cone is always pressed against the frame tube/unfolded or against the seat-tube/folded.
    I've been thinking about doing something like this. What holds the small wooden ball inside the seatpost?

  16. #41
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    Quote Originally Posted by rhm View Post
    I've been thinking about doing something like this. What holds the small wooden ball inside the seatpost?
    It's not inside the seatpost - its size is such that it's only half inside - you can see it in the picture "seat_adapter" - it's red. You can use anything else, even tie the rubber band to the seat rail - I didn't do it, because I want to be able to remove the seat easily.

  17. #42
    Senior Member brommie's Avatar
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    -Fenders are painted black –

    which paint did you use to color the (plastic?) fenders?
    Did the paint hold easy an the fenders? (I suppose this are the same fenders as on the Brompton.)

    I personally would love to color my fenders.

    Thanks for the info (BTW your bike looks great!)

    Brommie

  18. #43
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Played with the new Twenty this afternoon and even went out on a test ride...the best part was when I was blowing by guys on real bikes...

    Swapped out the quill pedals and replaced the old brake shoes so now it will stop when it's wet.



    I got the bars taped and dressed up the saddle to match...



    Love that tape.


  19. #44
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    Quote Originally Posted by brommie View Post
    -which paint did you use to color the (plastic?) fenders?
    (BTW your bike looks great!) Brommie
    Thanks - I first painted them with a spray that is intended for plastic, but it didn’t hold. Then I removed that paint, sanded with very fine paper, and sprayed them with car-paint. So far it has held.

  20. #45
    Stefan Stiletto
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    I am planning to convert a Dahon Speed D7 bike to use an internal hub gear and some kind of hub brakes. I am considering SRAM or Sturmey Archer hub brakes or even Shimano roller brakes. As there are no frame fittings I will be using P clips to fix the torque arms and some kind of chain tensioning device.
    The front fork spacing is 74mm which will restrict my choice of hub brakes. Does any one know of a hub brake in that width?

  21. #46
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Replaced and repacked all the bearings on my Twenty, fitted some new 1.75 tyres, and added a rear fender since it's still a little wet in places.

    Rode it 10 km and was most pleased with everything I have done so far... now I need to build some new wheels even though the stock ones roll plenty fast.

    Also saw a nearly mint 1969 Phillips Twenty at the shop and had to take a pic of the girls together.




  22. #47
    hubgears BB49's Avatar
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    Quote Originally Posted by maranen View Post
    ...The straight handle-bar is fitted with a bar-adapter – the cables run through the short tube of bar-adapter ...
    -
    Nice mods Maranen,

    What brand is the bar adapter, and where can I get it.

  23. #48
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    Quote Originally Posted by BB49 View Post
    Nice mods Maranen,
    What brand is the bar adapter, and where can I get it.
    Thanks - I bought this <MOUNTY SPECIAL MTB / ATB Ahead-Vorbau "Vario-Stem"> from here http://www.fahrradversand.de/bikes/c.../1/language/en
    There are different types available from other manufacturers, but this rised the handle bar to right height for me (I'm 175cm).

  24. #49
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    My other Twenty has been a busy little commuter and I figured she needed folding baskets, a cup holder, a folding mirror, and I installed new performance slicks and put new reflectors on the baskets last night.

    I also removed the stock stand and mounted a centre stand which is great for when I have luggage and when she gets folded up in the rear porch... she's not a frequent flyer.

    Oh... I can't forget the dual drive on the 3 speed... that rocks.




  25. #50
    Senior Member cyqlist's Avatar
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    Quote Originally Posted by Mr. Smith View Post
    Whether its a hub dynamo subwoofer system, neon lights, hydraulic shocks, or maybe just a new set of grips, what have you done to change what you didn't like about a folding bike you own?
    I put a Brooks saddle and a Schmidt dynamo disc hub on my Mobiky.


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