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  1. #1
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    altitude 650b............

    Does anyone know the actual bottom bracket height of the new Altitude 650b bikes? the website only says that it's +/- 10mm but doesn't say what the neutral bb height is................ anybody?

  2. #2
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    You can view all the permutations here: Ride 9 || Rocky Mountain Bicycles

  3. #3
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    And it depends on the tire size too. The neutral BB height is the radius of the wheel/tire when there is 0mm of BB drop. The actual rolling diameter of most 27.5" wheels with tires is actually very close to 27" diameter so the neutral BB height on the Altitude should be 13.5" (give or take - before sag)
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  4. #4
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    The Altitudes come with Nobby Nic 2.35" tires which may be about the tallest 650B tires at 27.75" tall. That would give a BB range with the Ride 9 of 13.47"-14.2" with a median (0 BB setting) of 13.875".....if my math is correct. When I was considering the Altitude I went through this whole thing and loving the fact I could get a nice high BB setting (I live in rocks).
    2013 Banshee Spitfire V2 650b

  5. #5
    4.0" fully suspended
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    I heard OD of hans dampf was a little over 700mm. This table must be measuring at 25 psi with bike weighted?
    My numbers for bb height without sag were almost identical to skidad - 13.4" to 14.1"

  6. #6
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    They were deriving the diameter from the rolling circumference of an unloaded wheel/tire, so they were dividing one rolled circumference by 3.1459 to get a rolling diameter.
    I'm a member of NSMBA and IMBA Canada

  7. #7
    Cleavage Of The Tetons
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    Anyone have a recommended air chart for the rear shock?
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  8. #8
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    Body weight is always a good place to start for the rear shock and then adjust up or down by 10psi at a time until you get the sag dialed to 25-30%
    I'm a member of NSMBA and IMBA Canada

  9. #9
    Cleavage Of The Tetons
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    That would be SOP...BUT those high bastards up on the shore, n' all....;-)
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  10. #10
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    But it would would have been designed while they were still in Delta.
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  11. #11
    Rocking on a Rocky
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    12.75 inches from the floor to the bottom of the BB shell with the shock cam set in position 8.

  12. #12
    Cleavage Of The Tetons
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    Measure to the effective center of the BB spindle, not the bottom of the shell.
    "We LOVE cows! They make trails for us.....

    And then we eat them."

  13. #13
    ccm
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    Quote Originally Posted by rockyuphill View Post
    3.1459 .
    ????
    did MBA use some anti-metric conversion?
    rather than 3.14159

  14. #14
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    Accounting for inflation - economic rather than atmospheric.
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  15. #15
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    Demo'd this bike this morning, I'm sold. For me this rides much better than the Bronson I demo'd the other week. Just would love one more ride on my more 'local' trails to get a better feel for it but the bike climbs excellent despite the lack of rear lockout and I actually set some PRs on a couple descents that I only sort of knew on a brand new wheel size. Was very happy!

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