• I think reaming too much out is actually quite a hard thing to do.

    I thought I’d done it to a frame I’d just spent months building but it turned out I just had a shit, undersized headset. Obviously that’s not the case here but I spent a while contemplating it.

    The reamer is (presuming they used a pucker head tube reamer and not an adjustable hand reader or something) a set size. It’s not like it’s tapered and you could go too far along the taper.

    There’s also guide bushings and stuff to keep the cutter centred in the headtube so it’d be hard to use the tool incorrectly.

    Is your headset new or has it been fitted previously?

    I’d guess the shop maybe doesn’t use the cutter much so it’s reaming out to the larger end of the ‘tolerance range’ and your headset is on the smaller end of the range. I was the first person to use the 1” reamer we have so I think that was part of my problem.

    You might find another headset (even another King, though I imagine their tolerance would be pretty consistent) fits more tightly.

    Worst comes to the worst King supposedly will make you a slightly oversized cup so it’s definitely not going to be a case of throwing the frame in the bin.

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