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  1. #1
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    HELP - Tapered fork on 1.5" straight head tube?

    Hi there.

    I'm looking for some advice on this matter.

    I'm about to buy a tapered steerer fork (RS Sektor), and planning to pair it with a Jamis Komodo 2012 frame (not the newer 27.5) that has a 1.5" straight head tube.

    The frame came with a 1.5 to 1 1/8" reducer headset, the reducer cups being pressed into the head tube. My previous fork had 1 1/8 steerer.

    So my question, as posted in the title is:

    Could I keep the upper part of my current headset as it is, and replace the bottom (by removing the reducer) with the lower part of a tapered headset?

    Basically I would buy a tapered headset and use only the lower end.


    Hope I've explained my point.. Not a native speaker heh.
    Thanks in advance.
    Last edited by Dan_Mack; 1 Day Ago at 06:45 PM.

  2. #2
    SP Singletrack rocks
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    what was the original fork on the bike. was it 1.5 straight or 1 1/18 straight?

    If it was 1.5 straight all you need is to reduce the top cap.

    If it was 1 1/8 straight all you need is a bottom part ofhte headset.

  3. #3
    > /dev/null 2&>1
    Reputation: Procter's Avatar
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    So your old fork was 1 1/8th at the bottom and your new fork is 1.5 at the bottom and you're wondering whether you can mix and match headset parts from different headsets.

    It's probably ok, but you could have trouble if the bearing preload recommendations on the two headsets are dramatically different.

    One indicator that this is the case would be that the top nut torque recommendation on the two headsets would be a lot different.

    You could look for a lower cup and bearing which is the same make / model as your top cup to be sure.

  4. #4
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    Quote Originally Posted by BushwackerinPA View Post
    what was the original fork on the bike. was it 1.5 straight or 1 1/18 straight?
    My previous fork was 1 1/8 straight.

    Quote Originally Posted by Procter View Post
    So your old fork was 1 1/8th at the bottom and your new fork is 1.5 at the bottom and you're wondering whether you can mix and match headset parts from different headsets.

    It's probably ok, but you could have trouble if the bearing preload recommendations on the two headsets are dramatically different.

    One indicator that this is the case would be that the top nut torque recommendation on the two headsets would be a lot different.

    You could look for a lower cup and bearing which is the same make / model as your top cup to be sure.
    I see.
    Honestly I don't know what brand is the stock headset, as it has no mark whatsoever and isn't listed on the bike specs sheet. All I can say is that is semi-integrated and has caged bearings.

    Maybe I should go whit this same bearing style for the lower part?


    Thanks for the replies.

  5. #5
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    Dude, you're thinking along the right lines, just get yourself a 49 External Lower cup to fit the new 1.5" lower of the taper and go for it. If you end up having anything so strange as different torque values causing issue between the upper and lower, then just buy the matching top. My PP Prime has a 1.5 straight HT and I liked the Cane Creek 40 series I used, cheap and worked well - EC49 lower/ZS49 upper.
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  6. #6
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    Reputation: Travis Bickle's Avatar
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    Yes you can do this. Hope sells individual cups.
    I got some bad ideas in my head.

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