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Hex (Allen) key between 5 and 6? (sopuli.xyz)
submitted 10 months ago by to c/bike_repair_tips@sopuli.xyz
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The hex nuts on the wheel axles of my bicycle are too big for a 5mm Allen key and too small for a 6mm one. What’s the name/size/something of one that would fit? I’ve been googling but to no avail. I know it exists because the shop I got it from had one (but they didn’t know what it was called either or where to buy one from).

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[–] 14 points 10 months ago (5 children)

Could it be a imperial bolt and you need to use a 3/16 because imperial to metric doesn't match up exactly?

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  • [–] 4 points 10 months ago (2 children)

    I think between your comment and everyone else saying to try a 5.5, this is most likely it. Only other idea is that the holes are wallered out, but a slightly larger key and a hammer should fix that.

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    • [–] 6 points 10 months ago (1 child)

    The numbers are usually millimeters, try searching for a 5.5mm Allen key.

    Lots of results when I search but no idea what country you're in so pointless me sending any links.

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    • [–] 5 points 10 months ago

    Could it be a 5.5? Or a 5 plus a big elastic band maybe?

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    [–] 4 points 10 months ago

    5.5mm Allen wrenches are a thing, are popping up with my basic internet search.

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    [–] 2 points 10 months ago (2 children)

    Are you sure it's a hex and not a Torx? T30 Torx is approximately between 5mm and 6mm IIRC.

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