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Old 06-17-09, 11:35 AM   #1
Syscrush
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Stupid pedal question

Why is there a left-handed thread on the left pedal? To me, this would make sense on the right pedal, not the left.

If you were to fix the pedal to the shaft it's on, and pedal the bike, both pedals would loosen where they thread into the cranks - I always assumed that it would be desirable to have the pedalling action cause the pedals to tighten where they thread into the cranks.

What's going on here?
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Old 06-17-09, 11:45 AM   #2
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http://www.sheldonbrown.com/gloss_p.html

Great explanation for this under SB's entry for 'Pedal'
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Old 06-17-09, 11:48 AM   #3
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Oh, and also 'Precession', with some links to more articles.
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Old 06-17-09, 11:53 AM   #4
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By being on the left side, both pedals tighten to the crank-arms by turning them in the direction of the front of the bike. This matches the direction of a forward pedal-stroke - so maybe the pedals will tighten on more by pedaling. Rather than unscrew and fall off as the bike is being ridden.
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Old 06-17-09, 12:17 PM   #5
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I dont know the reasoning behind it all.. but once you figure that out... go and figure out the reasoning behind french threading...cuz it is the exact opposite of standard ISO or whatever it is called... IIRC a different axel width altogether.
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Old 06-17-09, 01:03 PM   #6
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Quote:
Originally Posted by Panthers007 View Post
By being on the left side, both pedals tighten to the crank-arms by turning them in the direction of the front of the bike. This matches the direction of a forward pedal-stroke - so maybe the pedals will tighten on more by pedaling. Rather than unscrew and fall off as the bike is being ridden.
Maybe, you should have looked at the Sheldon Brown link first.

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I dont know the reasoning behind it all.
Your ignorance would have been quickly dispelled by looking at the Sheldon Brown link!
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Old 06-17-09, 01:03 PM   #7
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That is awesome. Thanks very much for the link, the explanation makes perfect sense.

So, once again the answer comes from Sheldon. It's not hard to see why he remains such a beloved feature of the bicycle scene.
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Old 06-17-09, 02:16 PM   #8
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And maybe not. All that truly matters is to know which way to install or uninstall your pedals - if you're a home-mechanic. Tighten - towards front. Loosen - towards rear.

Regards the French...well a friend of mine bought a house he said was (it really was) "built by a Frenchman." I asked him what he meant. He told me to go into a dark bedroom and find the light-switch. I found it - behind the door that opened inwards into the room. Nearly bonked my head doing it. My friend sat there grinning.
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Old 06-17-09, 08:26 PM   #9
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Remember that the bearings acts as planetary gears and reverse the direction of rotation.
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Old 06-17-09, 09:09 PM   #10
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Regards the French...well a friend of mine bought a house he said was (it really was) "built by a Frenchman." I asked him what he meant. He told me to go into a dark bedroom and find the light-switch. I found it - behind the door that opened inwards into the room. Nearly bonked my head doing it. My friend sat there grinning.
Built by a Frenchman, to American code.
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Old 06-17-09, 09:18 PM   #11
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And maybe not. All that truly matters is to know which way to install or uninstall your pedals - if you're a home-mechanic. Tighten - towards front. Loosen - towards rear.
Not really. I put my pedal wrench on the pedal spindle and turn the crank backwards until the pedal tightens.
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Old 06-17-09, 10:27 PM   #12
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Not really. I put my pedal wrench on the pedal spindle and turn the crank backwards until the pedal tightens.
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Old 06-18-09, 06:01 PM   #13
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Hey, don't laugh. It works.
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Old 06-18-09, 06:04 PM   #14
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I'm not sure why you even would laugh as it's the fastest and easiest way to do it.
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Old 06-18-09, 06:26 PM   #15
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Because it works is why I laugh. I find this adds more fun to, for some folks, the puzzle of why pedals screw on this way or that. Now I'm waiting for someone to ask about removing pedals by pedaling backwards!
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