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  1. #1
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    What head angle is best for 650b?

    I'm looking at a new build based on a 26" frame and converting it to 650b. Since the larger wheel changes the trail angle, what in your experience is the best head angle to use for 650b and AM? I will be using a Boss 170mm fork.

    My short list is Ibis HD, Pivot Firebird (67 deg), Liteville 301 (65.5 - 66.5) Liteville 601 (64.5 - 66). Thanks.

  2. #2
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    The slackest 26" bike I ride is 67 degree and I don't own a freeride bike and prefer all round trail riding. I prefer 650B at 68 to 69 degree and 29er at 70 to 71. My guess is add one degree to what you are used to in 26" and your in the ball park. Usual 650b trail bike geo is 68.5 to 70 degrees compared to 26" 67.5 to 69.The difference is mainly the change in trail and stabilty of the larger diameter tire. The actual diameter only changes my head angle about 0.3 degrees with current tires from 2.4" 26" tires.

    I think from 67 degrees, and steeper, it's any easy transition.Any slacker and your slow speed handling will suffer enough to have to shorten the stem. If your free riding, then what does it matter, just go for broke. If currently riding 29er at less than 68 degrees then you probably won't even blink at using 65 degrees in 650B.
    Last edited by gvs_nz; 03-12-2012 at 01:24 AM.

  3. #3
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    Split the difference between 26" and 29" would be a starting point. Other than that, you are going to have to experiment.

  4. #4
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    And it also depends on the fork you are using, no?

  5. #5
    Mr.650b - Mr.27-5
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    You really want to shoot for a mechanical trail value for the class of bike you are riding, XC, Trail, AM, DH, ect...

    Cheers,
    KP

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