Building a 29'er fat tire using an exsisting frame- Mtbr.com
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  1. #1
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    Building a 29'er fat tire using an exsisting frame

    Well I think I am going to go to a 29'er fat tire... but the Krampus prices are a little higher then I would like....

    Where would I find the proper width bottom bracket housing for it... other than that I am looking at buying an existing steel 29'er frame and modding from it since there are a few down around $200.

    I am open to suggestions for frames to start with.. front fork is handled as I will use a lefty ( I have one to spare...

    Any suggestions....other then leave it to the pro's and just buy a new one LOL... will be appreciated...

  2. #2
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    I had much the same thoughts when I saw the Krampus tyre - a use for my pile of unused 29ers, but it's too wide and tall for them.

    Can't think how it could be done cheaper than buying a new frame unless you already have the frame building gear available and are doing it yourself.

    The cheapest way into this may well be a secondhand Pug frame.

    It's a cunning marketing move by Surly. They make the tyre available, the 29er crowd get sucked in to buying them, and after trying to fit them they discover they need a new frame. So the 29ers either buy a new frame from Surly (the only source) or a second hand Pug, thus eventually leading them to the way of full fatness. Meanwhile we can flog off our old Pug frames and buy a Moonlander, so they score yet again. (I wonder if Surly's marketing guys previously sold alternative pharmaceuticals, they seem to understand how to exploit addiction )
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  3. #3
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    i am still on the lookout for a large pugsley frame and i don't need a front fork as that might be the better fit...

  4. #4
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    Would'nt you be better off looking for a frame designed for a longer axle to crown fork than the pugs?

    I cant see any standard 29er frames working either. I have some WeirWolf 29" x 2.55" tires, and they seem to fill the rear end of most 29er frames.
    A big boy did it, and ran away.
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  5. #5
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    the rear triangle is where the welder will have to be used.. as axle to crown i will be using a lefty dlr that in stock form only has 4" of travel and will be reduced a bit for the 30" diameter

  6. #6
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    use a crowbar and adjust the frame as need be

  7. #7
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    Quote Originally Posted by captbuck View Post
    use a crowbar and adjust the frame as need be
    A car screw jack is a more elegant way

    But first bolt an old hub in the dropouts to keep them in line.

    It helps if you shape a couple of pieces of wood for the tubing so it doesn't get locally flattened.

    I've done some regrettable things to bicycles, so results and risks are all in your hands.
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  8. #8
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    I'm planning on modifying my Fargo to fit 29+ wheels. Probably not until next summer so I haven't pit much thought into it. I'm assuming it'll involve cutting and brazing of the rear triangle (at the very least the chainstays).

  9. #9
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    I am not sure the way it will end up I need about 10-20 mm on the seat stay and about 10 mm on the chain stay...... the chain stays have over 10 mm clearance to the stays......so maybe even a new bottom bracket.... If it was a steel frame it would have been done already LOL anyone want to trade an aluminum frame for steel LOL

  10. #10
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    Quote Originally Posted by jnl1105 View Post
    the rear triangle is where the welder will have to be used.. as axle to crown i will be using a lefty dlr that in stock form only has 4" of travel and will be reduced a bit for the 30" diameter
    The A-C of a standard pugs fork is only around 447mm. Which isnt really suspension friendly (the mukluk is 468mm I think, as the enabler is designed as a sus fork replacement).

    Saying that, you get a lot of travel for your A-C with a lefty. Assuming your lefty is designed to have 4" travel with 26" wheels. It probably has a A_C of around 480mm. Running that with 30mm of sag gets you down to 450mm. So In my muddled head it seems spot on. If its 10mm longer you'll get a 0.5 deg slacker head tube angle, and a 5mm higher BB. Both of which would work fine on a hard tail pugs.

    That rear triangle is going to be tricky though.
    A big boy did it, and ran away.
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