GMC Motorized Road Bike

Discussion in 'Photos & Bicycle Builds' started by Rconce01, Oct 5, 2008.

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  1. Rconce01

    Rconce01 Guest

    Lets see what happens so far this is my first motorized road bike. The previous one was a mountain bike.

    Anyone know where i can get a cheap thumb throttle. I really need one for this setup. The one that mounted on the handle bar doeasnt work to well on this type of bike.



  2. beach cruzin

    beach cruzin Guest

    i would mabey sugest some differnt bars anyway those look slightly uncomfertable imo
  3. Rconce01

    Rconce01 Guest

    WEll they are not too bad i am a real skinny dude with a good back ...well so far its good.
  4. Mountainman

    Mountainman Active Member

    but -- they do look fast

    that's the difference between 26 and 57 yrs old

    how far we can bend it over or straighten it out --- well - I think you know what I mean

    another note -- looks like your cables run under your motor mounts ???

    a very nice looking MB you got going on there

    makes it great when we wish to -- Ride That Thing
  5. levsmith

    levsmith Member

    looks nice. where did you get the rubber pads on the mounting hardware? Very good clean install
  6. Rconce01

    Rconce01 Guest


    the back mount is the stock setup. the bottom mount are some u clamps from B&f marine, along with the matching nuts and lock washers from home depot. The metal flange between the motor and the frame was drawn by me on cad and fabricated (i cut a piece of steel and drilled it to work with the u clamps). The mounting pads were left over shock bushings off my corvette shocks.

    Today i should be getting a 36t sproket and the rear clam shell adapter. the only little problem is that i gat slighty more vibration than other bikes i have built and i think its those rubberized mounting pads that i used between the engine the u blots and the frame.
  7. levsmith

    levsmith Member

    cool. i should also be getting a 36t sprocket today for my chopper. but i wont be able to put it on till this weekend cause im in college in a different town. I also get a little vibration still with my rubber strips around the mounting bracket. i figured that the rubber would make it better. why do you think it made it worse?
  8. Rconce01

    Rconce01 Guest

    The smoothest bike I have is actually my first very ghetto build mountain bike. Everything is mounted directly to the frame metal to metal. The bike looks very ugly just because it wasn't a new bike and I didn't care for it to look good, but it rides super smooth.

    Dude sorry to hear you go to college in another town, I go to school to for my masters but its very close to home....the down side is that I have to work, so my time to fool around with the bike is a bit limited.
    I am going to try to remove those rubber pads and replace them with wood . Later on I might try to fabricate something a little more professional in the cnc mill we have at the school lab out of delrin plastic.
    Last edited by a moderator: Dec 15, 2015
  9. levsmith

    levsmith Member

    what are you getting your masters in? sounds like some of the classes i have. im majoring in machine drafting right now and might go to get my mechanical engineering degree. i also have a cnc class and im trying to decide what i want to make when we have time to do our own stuff. let me know how the wood works out.
    Last edited by a moderator: Dec 15, 2015
  10. Rconce01

    Rconce01 Guest

    I gaduated from my bachelors in architecture in 02 and last year I began the masters in architecture after several years of working. The school has undergone many technological advances since my graduation in 02. They focus several classes towards digital fabrication. This includes designing in programs like CAd Rhino maya and 3ds max and fabricating the components via the laser cutter, the 3d printer (very cool for protypes) , or the cnc mill. Alot of the classes are geared towards looking at innovative ways of improving on you typical boring box with a window.

    For example one class this semester we were given an "artichoke" asked to analyze it and create something that related to the human being and study its performance. So I developed a shelter structure very similar to a bus stop but way radical.

    In a way both of our degrees are similar in the sense that they deal with final product that must perform, it just my degree creates objects that are a little more abstract and (maybe less practical / econimical)
  11. bike looks good, you should be able to find a thumb throttle for a dirt bike or ATV on ebay or whatever. you could switch one of the brakes to be your throttle pull perhaps?
  12. levsmith

    levsmith Member

    yeah try that. i got a used dirt bike twist throttle and cable for 13.53 on ebay. The throttle fit perfect and the cable worked perfectly with the happytime. it is much easier to twist and ALOT better quality.
  13. eltatertoto

    eltatertoto Guest

    pretty cool, i have the same exact bike. i would just cut off 1/2 of a normal brake handle. then u got a redneck thumb throttle.
  14. Heh steel cast motor I just repaired one nice steel barrel... man.. Ill bet he gets a lot of miles outa that 66 or 50. the carb on the one that I repaired needed to be replaced I think someone changed the Jet. all brass on it . also the NT casting is flawless. Same chain tensioner and huge 3/4 gal tank, and pipe too. The one I repaired was a centrifugal Edition from I think Starfire Co. looked to be 5 or 6 years old.

    Nice mount.. Nice job all the way around. Do you mind me asking where you got the metal cast engine? I mean it looks like that one is too.
  15. happycheapskate

    happycheapskate Active Member

    I like this. I have one of these bikes, (with a real handlebar and stem on it, not the goofy 3 piece system they cobbled together to put the gripshifts on).

    If you measure the clamp without the shim, it will be the bulge diameter (like 31.8 or something). You can buy a mountain bike handlebar for $5-20 and gripshifts will slip right on. You can use the original road levers on the mtn bars, or get some replacements for $5 (steel "touring" levers, or cantilever mtn bike brake levers)