Results 1 to 6 of 6
  1. #1
    mtbr member
    Reputation: skyak's Avatar
    Join Date
    Sep 2008
    Posts
    271

    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
    mtbr member
    Reputation: skyak's Avatar
    Join Date
    Sep 2008
    Posts
    271
    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
    ups and downs
    Reputation: rockyuphill's Avatar
    Join Date
    Nov 2004
    Posts
    15,249
    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
    mtbr member
    Reputation: skyak's Avatar
    Join Date
    Sep 2008
    Posts
    271
    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 Probably the Info Sheet is outdated.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
    ups and downs
    Reputation: rockyuphill's Avatar
    Join Date
    Nov 2004
    Posts
    15,249
    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
    mtbr member
    Reputation: skyak's Avatar
    Join Date
    Sep 2008
    Posts
    271
    This fork looks interesting to me. Not sure where you can buy it in Canada though.

    2013 TS8 650B 150 Tapered

Members who have read this thread: 1

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •