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  1. #1
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    2012 29er lefty 1000 xlr axle to crown? How different to converted 26er?

    Can anyone tell me the axle to crown of the 2012 29er xlr 1000 lefty?

    I'm looking to deliver an a2c of 506mm. Understanding the 140 lefty's are 510, that's probably close enough. If so. Would it be the same similar to the new 29er specific fork?

    I would want lockout and probably look for the latest lefty I could find with good compression adjustments? so probably 2009/10.

    Apologies if these are obvious noob questions?
    Aka chainline...

  2. #2
    All Lefty's, all the time Moderator
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    A to C of any Lefty isn't affected by making it 29er compliant. The travel is just reduced to prevent the crown from hitting the larger diameter tire.
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

  3. #3
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    Ta for that. It helps. For clarity do you know ifthe new xlr1000 has the same a2c as the 'old' 140 then?

    And finally is the offset on the 29er fork any different? What is it on both forks?

    I am a fan of Jones/Fisher geometry ( they discussed it/I had a jones) where the fork has increased offset to reduce trail on the 29er giving quick handling but with 'normal' head angles and thus stability with shorter chainstays.

    I'm looking to build a custom Nicolai AC29er with a lefty :-)

    Will I need to be careful about headtube length due to the clamps? Specific requirements?
    I will specify 1.5" headtube but I'd like to use a normal 70mm stem. My other concern is keeping the front fairly low (hence 1.5" HT for integrated H/set) and so what's the min stack above the top clamp to use a 70mm stem with a 31.8mm OS bar?

    Sorry for lots of questions, it's big $$$ on s frame and fork to mess up so I want to get my facts right first!

    Ta for all help :-)
    Aka chainline...

  4. #4
    All Lefty's, all the time Moderator
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    Quote Originally Posted by the_pilot View Post
    For clarity do you know ifthe new xlr1000 has the same a2c as the 'old' 140 then?

    Will I need to be careful about headtube length due to the clamps? Specific requirements?

    I will specify 1.5" headtube but I'd like to use a normal 70mm stem.

    My other concern is keeping the front fairly low (hence 1.5" HT for integrated H/set) and so what's the min stack above the top clamp to use a 70mm stem with a 31.8mm OS bar?
    Sorry, don't even know what fork that is, spend a lot of time fixing, not much time following the new stuff.

    A to C for all Leftys (vintage not relevant), 100mm fork- 480, 110 fork- 490, 120 fork- 500, 130 fork- 510, 140 fork- 520.

    137 mm space between the clamps, be sure to consider stack height of headset when planning HT length.

    I'd go 1 1/8" headtube, 1.5 doesn't really help you at all, unless your builder prefers it. You'd be using a P321 fork adapter fro your stem anyway, so why bother with two adaptions?

    Offset, 45mm

    Stem can go right to the clamp, as it does on a Cannondale.
    This is a Pugs not some carbon wannabee pretzel wagon!!

    - FrostyStruthers



    www.mendoncyclesmith.com

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