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  1. #1
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    HDR 650b: 160 travel mode=150mm travel?

    Has anyone done this? From Singletracks Bike forum:

    Ibis Releases the Ibis Mojo HDR with 650b wheels! | Mountain Bike Forums

    'Want more travel in 650b mode? Here's what you do: Set the frame up in the 160 travel mode, and add a 5mm travel reducing spacer in the shock. Deflate the shock to check that your tire won't hit the seat tube at bottom out (tire sizes vary a lot). You'll get 150mm of travel in this mode.'

    I have read about BikeCo doing something similar with a custom Marzocchi TST R rear shock that gets you 147mm of rear travel. I just wanted to see if anyone else has done this and what shock did you use?
    You gotta Get Up to Get Down!

  2. #2
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    My buddy has it on his HD and really likes it. Understand the 5mm shock spacer equates to 147mm of travel. Leverage ratio of 2.6x5mm spacer=13mm reduction in travel. It is not 155mm.

  3. #3
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    There are plenty of Mojo HD conversions running the 160mm mode with a shim on this site, just visit the 650b forum. I do not think you need full 5mm of shims for the HDR. I have a 1/8" shim on my HD and the tire has not licked the seat tube, yet. Two issues with this conversion: 1. limited size of tires in the rear 2. high BB. The Marzocchi shock alleviates the second problem by having shorter eye-to-eye length, shorter stroke and offset bushings.

  4. #4
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    The HDR with 26" 160mm shock mount chips and 8.5 x 2.5" shock can tolerate 2.25" shock stroke using most but not all 650b tires before contacting the seat tube, same as the HD 2n'd generation (available August 2011).

    A minimum of 1/4" or 6.25mm shock bottom spacer is required for the HRD 160 with 650b wheels, which I estimate to roughly 150mm vertical wheel travel. Taller 650b tires, Hans Dampf 2.35, Trail Taker 2.4, would need a longer bottom limitation spacer.

    I have not actually measured an HDR with 650b yet. This is based on my measured 2n'd gen HD, and Ibis communication that the HD and HDR 160 have the same wheel path.
    www.derbyrims.com STRONGER, STIFFER, LIGHTER

    29 x 35mm wide
    650b x 40mm wide

  5. #5
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    Does anyone know how high the BB is with this setup (non bikeco marzo shock)?

  6. #6
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    Measured by buddy's HD a few days ago and it was 14.3"

  7. #7
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    Quote Originally Posted by martinizer View Post
    Does anyone know how high the BB is with this setup (non bikeco marzo shock)?
    It depends on your fork and tires. Mine sits at a little over 14.5".

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