Front Fork Replacement

Discussion in 'Motorized Bicycle Welding, Fabrication and Paintin' started by MrLarkins, Jun 13, 2009.

  1. MrLarkins

    MrLarkins HS Math Teacher

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    I came upon another bike that had front suspension, but the frame was too small for a motor to be mounted. And I don't (at the moment) want to make it fit. I tried to straight swap out the front forks of my MB with the suspension forks, and quickly found out the incompatibility factor. The suspension forks had a shorter thread pipe and I couldn't get them to attach.

    Suggestions? Would replacing my front forks with suspension forks even be worth with?
     

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  2. dvddtz

    dvddtz New Member

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    Yes, to me it is well worth it,it is a much smoother ride.I wont ride with out front suspension.Just my opinion.David usflg
     
  3. MrLarkins

    MrLarkins HS Math Teacher

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    thanks for the reply...so should i order a front fork, or work to modify the one i have?
     
  4. dvddtz

    dvddtz New Member

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    I was lucky and had a few parts bikes around with susp. forks.Im not sure how to modify the forks you have.I get most of my stuff from the flea market.You can check on craigslist for a cheap front susp. bike,newspaper, etc.Just make sure the head tube measurements are the same.Or get one from the local bike shop.Just depends on how much money you want to spend.Dont forget e-bay also. David
     
  5. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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  6. wheelbender6

    wheelbender6 Active Member

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    I consider a suspension fork to be a vital safety item on older roads and in construction areas. It makes it easier to "hang on" to the bars when you hit that huge bump.
    I bought a few threaded forks before I found one that would fit well. Just don't spend too much when you buy one. Some forks, like the older Marzocchis have a replaceable steering tube (its held in place by a couple of allen bolts). I was able to order steering tubes of different lengths on EBay.
     
  7. Retmachinist

    Retmachinist New Member

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    I had exactly the same problem when I went to add a suspension fork to the old (orange) cruiser bike that I shipped to Arizona. The diameter was the same but was about 1/2 inch short of working. Luckily the way the fork was made I was able to chuck it up in the lathe, turn it back that 1/2" and it worked perfect. You will have to watch for a fork that the neck is the right lenght and diameter as there are many different sizes.
    In answer to your question, yes the two bikes I have with the front suspension forks take the bumps alot better.

    John
     
  8. Ghost0

    Ghost0 New Member

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    Here is where I picked up a decent set of suspension forks. If your steer tube is 1 inch and your frame tube is not longer than 4.5 inches they will fit.
    www.NYCBikes.com
    and
    www.NYCBikes.com
     
  9. MrLarkins

    MrLarkins HS Math Teacher

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    my neighbor has a stick welder. he's going to help me lengthen the fork pike. He suggested we cut it, insert a smaller diameter pipe inside the cut fork pipe and weld it back together at the desired length. since i won't lose anything from trying, we are going to go ahead with it tomorrow. i'll take lots of pics of the process.

    on a side note, i called the local bike shop and asked about just getting some front suspension forks. the guy said they started at $200 and all he head next was me laughing as i hung up the phone on him.

    so, i have these old forks...is there anyway to lube them or make them more 'shock absorbent'?
     
  10. MrLarkins

    MrLarkins HS Math Teacher

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    well, my neighbor and I did it but I forgot to take the before and during pictures...All i have is the after, and thats not that exciting. I will say that front suspension makes a TON of difference.

    since the fork pipe with the threads wasn't long enough, we had to cut the pipe, and insert an extension inside it. my neighbor has a stick welder. after welding and grinding smooth again, the length was perfect.

    you might also notice that these new front forks also have better brakes.
     

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    #10 MrLarkins, Jun 15, 2009
    Last edited: Jun 15, 2009

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