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?

  • 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
  • 3
    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


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.


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.


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


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

  • 1
    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. 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

Rock Shock air forks, at least the ones I saw, have reverse threads in lower stanchions. (bottom cap nuts)

  • 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. Dec 11, 2022 at 21:41

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