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  1. #1
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    Reputation: skyak's Avatar
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    New Altitude Head Angle

    On the Rocky Website it lists 66.6 - 68.3 as the head angle range under the Geometry tab, and 66.9 to 68.1 on the Downloadable Info Sheet.

    Anyone know which is correct?

  2. #2
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    Also...Based on the dimensions of the frame, my calcs indicate that a 15mm reduction in fork height will result in a ~ 0.7 degree increase in head angle.

  3. #3
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    If you're talking about the new 650B Altitude, the head angle adjustment comes from the Ride 9 adjustment of the rear shock position, not the fork travel.

    The most accurate angle info is likely on the Altitude Ride 9 geometry calculator

    Ride 9 || Rocky Mountain Bicycles
    Last edited by rockyuphill; 10-24-2012 at 03:24 PM.
    I'm a member of NSMBA and IMBA Canada

  4. #4
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    Ya...the Ride 9 shows 66.6 as well. Probably the Info Sheet is outdated.

    I was doing the fork calcs to determine the head angle effects of using different forks, for example:

    the normal Fox 32 150mm is 520.9 mm.
    the Magura TS8 150mm "650B' fork A2C length is 530mm;
    the RockShox Rev 650B is 539mm;
    the Fox 34 650B is 544.5mm in 150mm mode.

    Potentially I could use a different fork with a slacker ride 9 set-up and find a happy medium.

  5. #5
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    In very general terms a 25mm change in fork A2C is worth about 1 degree in head angle change for the typical range of MTB wheelbases and geometries (plus or minus a bit).
    I'm a member of NSMBA and IMBA Canada

  6. #6
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    This fork looks interesting to me. Not sure where you can buy it in Canada though.

    2013 TS8 650B 150 Tapered

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