2017 Banshee Spitfire Bottom Bracket Height Question- Mtbr.com
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  1. #1
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    2017 Banshee Spitfire Bottom Bracket Height Question

    So got the frame putting my 2017 fox factory 160mm fork on it. Should I run the flip chips at low or neutral?

    This will be with 650b wheels and dropouts.

    Thanks guys.

  2. #2
    Hard funkinī Kraut
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    Why not trying out for yourself ... ?!?

  3. #3
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    Looking for a starting point as I'm indecisive. Frame states 431mm bb height which I'd be fine with in neutral but I don't think that's with a 160mm fork so wondering how much it will be raised above that.

  4. #4
    Braaap
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    The 2017 geo numbers use a 542mm axle to crown. That's a RS Pike 27.5"/150mm or a 26"/160mm. Your Fox 36 27.5"/160mm is at 549mm.

    Not worth crunching numbers in my opinion. Changing the dropout position easy, try both.
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  5. #5
    Incredulous bastard
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    Seems like a fine thread for this question. After breaking 3 V1 Spitfires (HT/TT interface)...I decided why not pick up a 2017 Spitfire? What could go wrong?

    And coincidentally my old 26" fork has died completely, and this is no time to buy a new 26" fork. So I went for a great deal on a 27.5" 2016 Marzocchi 350 CR.

    But I'm looking everywhere for the 350's AC length and not finding it. There is a "length" note on the 2107 Marzocchi website that says 567mm. That's significant when compared to 2017's geometry measurements taken with a 542 AC!

    I wouldn't mind a slighly slacker bike at 567 AC, but I'm not about to sacrifice BB height for a little HTA bump. So I suppose I ought to spacer that 350 CR all the way down to 140mm, to get AC down to 547mm. At that point the difference is negligible. Still, odd having to go all the way down to 140mm.

    And questions:

    -Has anyone run a Spitfire with a 140mm fork?

    -I used the contact form on Marzocchi's website to get clarification on "AC length" versus "length." I don't have high hopes that I'll hear from them. So does anyone have a solid number on the 350 CR's AC length?
    Last edited by no one in particular; 04-30-2017 at 08:11 AM. Reason: to change stuff

  6. #6
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    https://www.bike24.com/p2123440.html

    This suggests the 160mm 27.5 version is 557mm A2C, which makes a lot more sense. 567mm must be at the max travel of 170mm. That 15mm increase over a 150mm Pike will slacken the bike by a bit over half a degree and raise the BB by 5mm.

  7. #7
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    Thanks for that, threehats. I've looked at tons of reviews and lots of sellers, and that's the first one that I've actually seen reference the AC directly. Hopefully their 557mm isn't a typo, because I'd much rather spacer it down to 150mm than 140mm.

    The fork is scheduled to arrive today. I'll get an actual measurement and report back.
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  8. #8
    Incredulous bastard
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    So my actual measurement has the 350 CR at neither 557mm nor 567mm. I measure the fork at 562mm AC.

    So I'm back to spacing the fork down to 140mm. And then it'll have the exact geometry as intended...as I want.

  9. #9
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    I ran my spitfire with a manitou mattoc at 140mm for a while. I did change it to 150mm because I got a few too many pedal strikes with the fork at 140mm. At 150mm I still get the occasional pedal strike but not quite as many as before. 150mm seems to work better for me.

  10. #10
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    Looks like the Mattoc has a AC length of 555mm at 160mm of travel. So if you ran that down at 140mm, then you had a 535mm AC. so yeah, that's low! At 150mm travel your 545 AC length is really close to the published geometry using 542mm AC.
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