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  1. #1
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    Default What is the skinniest a frame can be?

    I'm building a frame for the first time for a divorced ironhead I've been working on and it just looks way too wide at 8" in between the bottom rails. I'm probably just gonna use a 16" sportster wheel and I was concerned about the chain scrubbing but it just looks fat. How skinny can I get it down to without that being an issue?

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    Not trying to be a dick but if you are asking this question maybe you shouldn't be building frames?

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    Quote Originally Posted by Lza555 View Post
    I'm building a frame for the first time for a divorced ironhead I've been working on and it just looks way too wide at 8" in between the bottom rails. I'm probably just gonna use a 16" sportster wheel and I was concerned about the chain scrubbing but it just looks fat. How skinny can I get it down to without that being an issue?
    as skinny as you want, as long as you make the engine fit

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    Click image for larger version. 

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    My frame is 1 5/8" wide.... does that help?

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    Quote Originally Posted by bobberadam View Post
    Click image for larger version. 

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    My frame is 1 5/8" wide.... does that help?
    And it looks DAMN good to boot.....

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    8 inch's Maybe too narrow for the chain and the mechanical brake rod? My Divorced Ironhead is 8- 3/8ths and would have liked another .250 in the span.I built a hybrid Sporty/Bigtwin frame with a fabbed hardtail section after stretching the lower bottom tubes 7 inches after cutting at the sporty casting/uptube motor mount section off to make real estate for the softail 5 speed.What year Sporty motor are you using?



    Last edited by kmanator; 07-05-2018 at 2:16 PM.

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    Fuck off dude. I'm trying to learn about offsets and shit

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    Yup lol I'm really worried about the rear end and the chain scrubbing. Not really the front half. Looks good though

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    Quote Originally Posted by kmanator View Post
    8 inch's Maybe too narrow for the chain and the mechanical brake rod? My Divorced Ironhead is 8- 3/8ths and would have liked another .250 in the span.I built a hybrid Sporty/Bigtwin frame with a fabbed hardtail section after stretching the lower bottom tubes 7 inches after cutting at the sporty casting/uptube motor mount section off to make real estate for the softail 5 speed.What year Sporty motor are you using?



    Its a 74. I'm using a disk brake in the rear and after measuring everything it looks like it'll fit with about a quarter inch on each side but I've been looking at some choppers that look like they're 6" all the way back. It may just look that way though. Mind if I ask what you used for the primary?

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    Quote Originally Posted by Lza555 View Post
    Its a 74. I'm using a disk brake in the rear and after measuring everything it looks like it'll fit with about a quarter inch on each side but I've been looking at some choppers that look like they're 6" all the way back. It may just look that way though. Mind if I ask what you used for the primary?
    I had the sportster motor sprocket milled into a hub then .006 interference press fit into a double row shovelhead compensator ring gear then welded after the offset was established then used an 82 link bigtwin primary chain.The final sprocket has a .500 offset to get the sweet spot between the primary chain/trans. and final drive chain alignment.
    This is the ring gear I used:

    https://www.ebay.com/itm/NEW-HARLEY-...EAAOSw4shYAREL

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    Interesting thread! More details always welcome.

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    Quote Originally Posted by kmanator View Post
    I had the sportster motor sprocket milled into a hub then .006 interference press fit into a double row shovelhead compensator ring gear then welded after the offset was established then used an 82 link bigtwin primary chain.The final sprocket has a .500 offset to get the sweet spot between the primary chain/trans. and final drive chain alignment.
    This is the ring gear I used:

    https://www.ebay.com/itm/NEW-HARLEY-...EAAOSw4shYAREL
    Awesome.that's the last thing I gotta do with the drivetrains I think. Thanks for all the help.

  13. #13

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    I love that single-loop frame, soo clean!
    While an unconventional approach, this is a very valid question. When considered without preconcieved notions of what a frame is, the answer is only limited by your imagination and safety constraints.
    Dream-on, dude!

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