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  1. #1
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    does gap between top of steerer tube and top of stem have to be 3mm

    Just cut a new steerer tube. The gap between it and the top of the stem is about 1-1.5mm. I know that 3mm seems to be preferred, so the stem cap has something to sink on to. When I crank down the stem cap, I get no rattle or weird feeling in the bars. Is 3mm mandatory or can I be lazy and stick with what I have? As I write, I have this weird feeling I should shut up and go back and finish the job I started by taking off another 1.5-2mm. What a PITA.

    ffff

  2. #2
    Senior Member
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    As long as the steerer tube doesn't come up against the underside of the top cap and prevent your getting the proper headset adjustment, you are fine.

  3. #3
    Senior Member caotropheus's Avatar
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    Either do the job untill the end or get a taller spacer

  4. #4
    Senior Member barba's Avatar
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    Seems to me that the only point of the gap is to allow the cap to pre-load the headset before you tighten down the stem bolts. Try it and see if it works with your current gap. If not, file that last mm off.

  5. #5
    Senior Member
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    Quote Originally Posted by caotropheus
    Either do the job untill the end or get a taller spacer
    An additional 2 mm spacer under the stem would also work if you don't want to cut the steerer again and can't get the proper adjustment as it is.

  6. #6
    Senior Member
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    When you think you are through hold the front brake tight and rock the bike forward and rearward while checking for movement between the steer tube and the lower end of the head tube (shouldn't be any).

    Al

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