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Which parts of a bike have reversed (left-handed) threads?

There's 1) the non-drive-side left pedal-to-crank threading and 2) the drive-side right bottom bracket cup (apparently sometimes called the fixed cup).

Is there anything else?

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4
  • What country is the bike from? French/Italians are contrary to the usual rules.
    – Batman
    Sep 10, 2016 at 18:44
  • @Batman Mine was made in China for the American market but I'm also asking for general knowledge including how it's done in other places.
    – compton
    Sep 10, 2016 at 18:55
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    My point is that you have to be careful. There are bikes which use the exact opposite of the sane typical choices.
    – Batman
    Sep 10, 2016 at 21:56
  • 1
    The left pedal, always! The BB depending on the standard.
    – Carel
    Sep 11, 2016 at 10:52

5 Answers 5

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5

Fixed gear hubs have left-handed threaded lock rings, so that they can't be loosened when the cog that is on right handed thread is turned counterclockwise.

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3

I've just found that a freewheel internal thread is left-handed. This is the access for the guts of the freewheel's insides, so pawls and little bearings inside, and generally not user serviceable.

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2

On some full suspension mountain bikes some of the pivot/linkage bolts can be reverse threaded. Manufacturer dependant though.

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1

Bearings inside left pedals may be held in with LH threads.

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    That will depend on the particular kind of pedal. As far as I remember, the nut on the tip of the axle on CrankBrothers pedals is right handed in both pedals. The bearing itself is just pressed-in and held by a nut.
    – Vladimir F Героям слава
    Dec 10, 2022 at 20:52
  • @VladimirFГероямслава Yeah, all the CB pedals I've encountered have been RH threaded axles on both sides. However, Shimanos are different: bicycles.stackexchange.com/questions/72067/…
    – MaplePanda
    Dec 10, 2022 at 21:47
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Rock Shock air forks, at least the ones I saw, have reverse threads in lower stanchions. (bottom cap nuts)

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2
  • Which fasteners are you referring to? If you’re talking about the bolts holding the lowers onto the air shafts, I’ve found those to be all normal threaded…
    – MaplePanda
    Dec 11, 2022 at 17:44
  • No. The ones securing the shafts. Not the bolts securing the stanchion to leg.
    – Barış Atasoy
    Dec 11, 2022 at 21:41

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