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  1. #1
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    Shift head tube angle

    The haro website states the shift HTA at 70* on the small frame with a 120mm fork. Anyone have an idea what 10mm would do to that angle? I'm running a 130mm fork which is what the 2005 shifts came with. I'm just curious what the 10mm would put the angle at. I have a 2010 RS recon solo air fork which will go to 140mm. I'm thinking of trying the fork set at 140 and run a little more sag. I think it would work.

  2. #2
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    Enjoy playing http://bikegeo.muha.cc/
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  3. #3
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    Thanks for the link!! The only problem I have is I can't find the axle to crown measurements of the marz forks that come on the haro bikes. I was able to take the current measurements with the 130mm setting and going to 140 would slacken the head angle by .59*. What's strange to me is on the sram website, there's a table that shows axle to crown measurements for all the 2010 forks and according to the chart it says that going from 130 to 140 adds 12mm to the axle to crown. I would have expected 10mm?

    On a side note, I also came across some variances in my frame and the current shifts. I have a 2005 small frame and it's a 17". They don't offer a 17" currently but have a 16" and 18". My affective top tube is 22.5 which is in between the current 16" and 18". My wheelbase is 42.81 which is longer than both the 16" and 18". I'm assuming they changed the frame geometry at some point?

  4. #4
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    All measurements can be done with a tape measure

    http://manuelsweb.com/in_cm.htm
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  5. #5
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    I understand that but I don't have a marz fork to go by. That is the measurement I would ultimately need to figure out what my HTA is with a RS recon fork at 130mm. The current shift with the 120mm marz fork has an HTA of 70*. I would need the axle to crown of that fork to compare to my current fork to get an accurate current HTA.

    This could all be in vane since it seems my frame is different than the current ones anyway. I need an angle finder.

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    Here is a link too way to much info for forks if you dont find your answer their check the Marz support forum.

    Fork and Shock Service Information

    Marzocchi Support [THREAD CLOSED - please visit the Shocks & Suspension Forum]
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  7. #7
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    Well, I set my fork travel at 140mm on the shift, and I gotta say, it felt like the frame was built for that travel fork. Climbing didn't feel any different but I did notice the little extra slack in the HA. It just felt good. I also barrowed a rear shock from a buddy that has more travel than the shift was designed for. The shift takes a 7.875 x 2 and I put a 7.875 x 2.25 on it. I let all the air out to check travel and the rear tire does get pretty close (1/2" or so) to the seat tube (actually the front derailleur cable) but doesn't touch. That extra quarter inch travel on the shock puts the wheel travel at over 5" in the rear. These subtle changes made the bike feel so plush. Going downhill was mucho fun

  8. #8
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    Quote Originally Posted by dunerinaz
    Well, I set my fork travel at 140mm on the shift, and I gotta say, it felt like the frame was built for that travel fork. Climbing didn't feel any different but I did notice the little extra slack in the HA. It just felt good. I also barrowed a rear shock from a buddy that has more travel than the shift was designed for. The shift takes a 7.875 x 2 and I put a 7.875 x 2.25 on it. I let all the air out to check travel and the rear tire does get pretty close (1/2" or so) to the seat tube (actually the front derailleur cable) but doesn't touch. That extra quarter inch travel on the shock puts the wheel travel at over 5" in the rear. These subtle changes made the bike feel so plush. Going downhill was mucho fun
    Pimpin bro just dont let Goddess DHJ see this or she'll chastise you about the warranty.
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