8

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?

compton
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  • What country is the bike from? French/Italians are contrary to the usual rules. – Batman Sep 10 '16 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 '16 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 '16 at 21:56
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    The left pedal, always! The BB depending on the standard. – Carel Sep 11 '16 at 10:52

5 Answers5

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.

ojs
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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.

Criggie
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2

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

chored
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1

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

Criggie
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Paul
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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 '22 at 20:52
  • @VladimirFГероямслава Yeah, all the CB pedals I've encountered have been RH threaded axles on both sides. However, Shimanos are different: https://bicycles.stackexchange.com/questions/72067/which-shimano-pedals-have-reverse-threaded-bearing-adjustments – MaplePanda Dec 10 '22 at 21:47
0

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

Barış Atasoy
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  • 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 '22 at 17:44
  • No. The ones securing the shafts. Not the bolts securing the stanchion to leg. – Barış Atasoy Dec 11 '22 at 21:41