Cutting a Dyno Deuce Frame help !!!

Discussion in 'Motorized Bicycle Welding, Fabrication and Paintin' started by chain, Aug 16, 2015.

  1. chain

    chain New Member

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    I know a lot of people will not like this but I love this bike and I want to mount the Sachs tank and to do that I have to remove the 2 tubes after weld and seat post to front down tube . It seems like it will be strong enough because a lot of bikes don't even have that support . What do you guys think ??
     

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  2. wheelbender6

    wheelbender6 Active Member

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    I love the Sachs tank, but I wouldn't cut the Dyno frame. Get a different frame to cut. What about getting a step thru frame and add your own top tube that will support that nice tank?
     
  3. chain

    chain New Member

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    I know believe me I don't want to cut it but I want to use it for this build .
    It rides so great and I love the rear of of it . You wont notice I cut the frame when the tank is installed . Just didn't want to lose any strength of frame
     
  4. Goat Herder

    Goat Herder Gutter Rider

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  5. chain

    chain New Member

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    Hey funny cuz I had planed on doing that . My bud who makes motorcycle tanks was going to build me one . But I decided I didn't like the look of that . Well let me rephrase...I like it the standard Board Track thing but .I'm keeping the apes ,and as I ride the thing I feel like it's a kids bike cuz I sit up straight and it looks goofy as **** . I have apes and a suicide shifter on my harley so I guess thats what I like .I like the tank sitting up a little to make it seam like a bigger bike . But thanks man .
     
  6. curtisfox

    curtisfox Well-Known Member

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    It's your bike cut it if you want LOL maybe have a single tube put in place of the two.............Curt
     
  7. 2door

    2door Moderator
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    Don't cut the top tube. If it is removed there will be no frame strength. Yes, there are 'step-through' frames, women's bikes, but their frame design is different that a man's bike and the structural design doesn't require the top tube like your bike has.

    View the bike from the side and try to picture the forces applied to the frame when you're riding it. Your weight plus the shock of bumps will put all the force on the down tube where it attaches to the bottom bracket. The frame will fold up like a lawn chair without some structural support from the stem to the seat tube.

    Find another way to mount that tank or find another tank or bike.

    Tom
     
  8. chain

    chain New Member

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    hey not the top tube , the 2 middle tubes .
     
  9. curtisfox

    curtisfox Well-Known Member

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    Yep like I said just put a single tube in place of the two. LOL just cut enough of the two to fit the tank cap the ends with solid stock and fit a single in and under the two.............Curt
     
  10. chain

    chain New Member

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    Hey , Yea thats a good idea . I was just going to re weld the 2 a little better near and around the seat post . I dont need any of the 2 but everyone says I need them there for support , I don't know why because a lot of frames dont even have the extra bars . Like mountain bikes and road bikes .
     
  11. LandSpeedRecord

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    True the other bikes don't have them but they accounted for that when they designed them with different wall thickness, shape, positioning, etc. That's not to say the existing top tubes can not handle it but don'tassume it to be the same as others. Really think it thru and if possible running the two tubes into oneand under the existing as mentioned is probably the safest bet.
     
  12. culvercityclassic

    culvercityclassic Well-Known Member

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    I dont really dont see an issue with removing those tubes as long as you weld around them at the seat tube. You have a nice gusset at the head tube for added support. Most people dont really know the strength of those frames, thats my main choice for my builds all the way from 212cc four strokes to a wild KTM gear box bike I built. Another added bonus is the frame is made out of chromoly with some of the best welds I have seen on a bike frame.
     
  13. curtisfox

    curtisfox Well-Known Member

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    That's good to know,as I have never seen one closen. Thanks.........Curt
     
  14. 2door

    2door Moderator
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    Sorry. I misunderstood. We had a guy a while back who bought a bike that someone had removed the top tube on and was using the fuel tank and engine for structural support. The frame did indeed fail where we predicted it would. Just didn't want to see you make the same mistake.

    Removing the cantilever tubes could still be a gamble. As was mentioned above by LSR, the frame integrity is designed to utilize those tubes for support. Without knowing the wall thickness of the top tube you don't know how much strength you're removing. However we always tell people that, "It's your bike. Build it your way". We can only offer opinions when asked for them.

    Tom
     
    #14 2door, Aug 19, 2015
    Last edited: Aug 19, 2015
  15. chain

    chain New Member

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    Hey , Well to be honest ...it was seeing your Dyno that got me into this whole damn thing in the first place !! Man you do beautiful builds ... Kinda what I thought because of the gusset . And anyone who hasn't road one of these or seen one up close doesn't really know how great they are made and welded .I really feel bad about cutting it up ,but it's such a great bike with great lines I just cant find anything else that compares to it . I was going to go for the exact look or yours with the frame mounted tank but I like the apes and a higher tank to make it fit me better . Thanks for you input man !!
     
  16. chain

    chain New Member

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    Oh crap !! No, thanks man .I Appreciate all you guys helping and sharing the knowledge
     
  17. chain

    chain New Member

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    The only other bike I like is the Micargi Rover GT . And I think this Dyno is still a better made bike .
     
  18. chain

    chain New Member

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    Anyone ever heat and bend a frame ? Only need about 1/4" per side .
     
  19. culvercityclassic

    culvercityclassic Well-Known Member

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    I had to heat and bend the area in the attached picture, if you only need to bend a small area to get the tank to fit go for it. Rather do that then cut it.

    You can see I am a little Dyno crazy by the last picture posted.
     

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  20. chain

    chain New Member

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    Thanks I'm on it !!! Yea I love the curves of the dyno !!
     

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