50's monark gebe

Discussion in 'Photos & Bicycle Builds' started by wes, May 22, 2007.

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  1. wes

    wes Guest

    here's what i've been working on, a take off on the gebe engine mount. would like to install this engine in the frame with a jackshaft, but they are just too wide and still be able to pedal. i usually use the smaller 25cc engine, better gas mileage and you get to assist which i just love. next bike is on a 1938 schwinn ace. bigger tank, better frame than this monark, although i like the way this frame handles. it feels like a motorcycle. w.[​IMG]

  2. Guest

    Guest Guest

    What kind of bicycle is that? Nice! Really nice!
  3. iRide Customs

    iRide Customs Member

    Nice bike! How comfortable is the riding position with the seat so high?

  4. spunout

    spunout Member

    am i correct in saying that 'monark' is a type of frame, and not an actual brand name?

    oh, ok...it was the spelling that threw me off :p
  5. azbill

    azbill Active Member

    I believe monarch was the maker
    the old school springer forks are monarch replicas

    ps...they are really nice looking forks 8) 8) 8)
    but, they would look funny on my deviate :lol:
  6. gone_fishin

    gone_fishin Guest

    but they'd look mighty cool on wes's bike 8) 8)

    dig the frame...are we still waiting to learn about make/year?
  7. wes

    wes Guest

    frame and fork

    This is a Monark frame. boys cruiser from around 1948 to 55. i can't find any online records for serial # like you can for schwinn. i thickened up the dropouts and added tabs for the disc brake, and you need them with this 47r tanaka! it does over 40mph easy, but only about 130 mpg. the zenoah 25cc gets over 200 and you get to assist! the fork is not a repro, look closer. it's a modern shock fork RST 100 dollar cheapo 1inch from nashbar so i could run a disc and aheadset system. drive ring is bmx tuffwheel; need to add teeth in the track so it won't slip in the rain, which i'm doing now. gear ratio is 13:1 12g spokes are on their way also. i commute 40 miles round trip to work and have it licensed. last year i road a gebe system on a bianchi single speed 3000m and no pullovers so i guess they don't care if you act legal. helmet lights etc. this crap is severly addictive... i'm 47 years old, but when i'm on the bike i feel 12! rode motorcycles years ago and it was fun but not like this. SO cool i finally found this site! cheers!
  8. I love it, the mix of new tech on an old retro frame is very appealing. Who makes the rear pulley if you don't mind me asking?
  9. Bill Snow

    Bill Snow Guest

    That is an interesting setup. I have a couple of questions.

    How did you attach the drive ring to the wheel?
    I have a GEBE that I installed but on a heavy duty spoked wheel that I special ordered I found it impossible to get the ring centered. Went back to the standard wheel that was on the bike and got it centered ok. Thought your system may allow for some adjustment.

    It sounds like you are using the GEBE belt but how are you going to add teeth to the ring?

    Like what you are doing.
  10. OldPete

    OldPete Guest

    Great job wes! :shock: :smile:
    I'm nearing 60 and rode Brit and Eye-Tie motorbikes most of my life.
    I love the board track look of some of the powered bikes I've seen here.

    Bill Snow, read this review. 5 gallon bucket top!! :shock:
  11. tomcatfranks

    tomcatfranks Guest

    Nice Monark!! I have a late 1930s Monark myself similar kind of frame, mine has rear-facing back wheel drop-outs, though, with the screw-chain tensioners. Great job!!
  12. wes

    wes Guest

    monark frames

    good eye. your bike is most likely a pre-war model, as all schwinns pre-war have the track style dropouts. to a collector it would be worth more. i have added 12g spokes to the drive side and inlet gear teeth in 3 places on the drive ring to mesh with the belt. The 47cc engine would cause slippage, worse in the wet and was breaking 14g spokes like nobody's business! Of note, a driver clocked me at 50mph on the flat (with a mild tailwind, maybe 5 to 10). wes.
  13. Hive

    Hive Guest


    Wes, ring is from where?

    I tried looking up over WWW and no luck.
  14. dbigkahunna

    dbigkahunna Guest


    Was this a mag wheel you cut the spokes out? How is it mounted to the spokes. I think I understand the drive which would be a toothed pully on the engine with a slick drive pully.
    Yes, No Maybe???
    BTY, sharp ride.
  15. srdavo

    srdavo Active Member

    awesome bike... tell us more about your drive setup, and how you attached your rear sheave/pully.