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  1. #1
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    Lefty 29 80mm to 90mm

    I was looking at the specs on the '11 Flash Carbon 29er 1 and noticed the the Lefty is 90mm. I have a '10 Flash Alloy 29er 1 frame with an '08 alloy DLR 80mm that's been upgraded to Solo Air. Knowing that the 29 version of the Lefty is a reduced travel 110mm, would increasing travel to 90mm work with the '10 Flash. Cannondale's archive website doesn't have geometry information available anymore to compare against the '11 Flash 29 geometry.
    2012 Cannondale Flash Carbon 29er 3
    2009 GT Peace 9R SS
    2008 Cannondale Prophet 4, Lefty Max TPC

  2. #2
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    The ride height of the Lefty will not change with the change in travel as it is done with internal spacing, so the geometry will be unaffected.

    You will not be able to increase the travel of your current Lefty to get the 90mm of travel safely. The 2011 Lefty 29er forks are actually Ultra 120's with three spacers taking them down to 90mm travel.

  3. #3
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    Quote Originally Posted by trauma-md
    The ride height of the Lefty will not change with the change in travel as it is done with internal spacing, so the geometry will be unaffected.

    You will not be able to increase the travel of your current Lefty to get the 90mm of travel safely. The 2011 Lefty 29er forks are actually Ultra 120's with three spacers taking them down to 90mm travel.

    So does that make the axle-crown dimension different than the 2010's?

    FYI- I removed a spacer from my 2010 Lefty 29er, had room to spare with a Racing Ralph 2.25" with no air in the Lefty. Never actually got the full 90 mm of travel while riding though as the air spring was tuned for 80 mm and ramped up to quickly at the end.
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  4. #4
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    Trauma-md, from your statement, the AC is different between my 29er DLR and the new 2011 version?

    Think I might try what Brentos described.
    2012 Cannondale Flash Carbon 29er 3
    2009 GT Peace 9R SS
    2008 Cannondale Prophet 4, Lefty Max TPC

  5. #5
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    Quote Originally Posted by jdinsj
    Trauma-md, from your statement, the AC is different between my 29er DLR and the new 2011 version? .

    I just measured the AC on my 2010 Carbon DLR 29 and my 2011 Carbon XLR 29 and the 2011 is indeed longer by 10mm (because of the use of the Ultra 120 structure for 2011)

  6. #6
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    Quote Originally Posted by trauma-md
    I just measured the AC on my 2010 Carbon DLR 29 and my 2011 Carbon XLR 29 and the 2011 is indeed longer by 10mm (because of the use of the Ultra 120 structure for 2011)
    Do you mind sharing the actual numbers for the 2010 and 2011? Thanks!

  7. #7
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    You can make the older lefty's 90mm by removing a spacer. It also depends on how big your tire is. I was able to get 90mm with 2.3 WTB's on my F29.

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