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Opposite Threaded BB

Old 11-25-21, 02:11 PM
  #1  
RustyJames
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Opposite Threaded BB

I picked up a weird Rudge single speed, Canadian market bike (late 1940’s?) and the BB is threaded the opposite of “normal”. The DS tightens to the left and the NDS tightens to the right. WTH!? So, as you pedal, both sides can loosen up? Anyone seen/heard of this?

FWIW - the cranks were replaced with Raleigh pieces but I highly doubt somebody would have erroneously rethreaded both sides. Possible but seems highly unlikely.
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Old 11-25-21, 02:16 PM
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Isn’t that standard for an English BB?

from the inter webs.

“What is an English thread bottom bracket?

The common threading for bottom bracket shells is called “English.” The left-side cup is a right-hand thread direction, which tightens clockwise and removes counterclockwise. The right-side (drive-side) thread is a left-hand thread, which tightens counterclockwise and loosen clockwise.Sep 24, 2019”.
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Old 11-25-21, 02:24 PM
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Sounds like the way modern threaded BBs generally operate.

While it seems like this arrangement would result in loosening, this assembly would only do this if the bearings were completely seized. If the bearings are rolling, even a little bit, the greater force tending to rotate the cups will be 'precession' - essentially the cup rolling around in the slightly larger BB shell, and this force is in the opposite direction of the rotation of the spindle.
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Old 11-25-21, 02:25 PM
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Seems normal to me. Right hand thread on the non drive side and left hand thread on the drive side, as Bianchigirll said.
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Old 11-25-21, 02:29 PM
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Yep, normal. French thread DS tightens to the right, and those are the ones that work themselves loose.
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Old 11-25-21, 02:39 PM
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I’m either;
A) Loosing my marbles
B) Working on too many Old Italian bikes or
C) Need to talk my doctor about my meds.

Carry on…
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Old 11-25-21, 10:36 PM
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Originally Posted by RustyJames View Post
I’m either;
A) Loosing my marbles
B) Working on too many Old Italian bikes or
C) Need to talk my doctor about my meds.

Carry on…
Or D) just mixed it up with the pedals.
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Old 11-25-21, 11:49 PM
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Originally Posted by Hobbiano View Post
Or D) just mixed it up with the pedals.
Yup. I compartmentalize my thinking to deal with deficiencies I have. It’s complicated.
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Old 11-26-21, 06:00 AM
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Of course all this is doomed by our word choices. I'll never understand why we choose "right" and "left" for a circular motion. If someone holds the wrench above the cup one answer is correct and if they hold the wrench below the cup the other answer is correct. And then we get into "right is right and left is wrong". Sheeeeesh. So simple to say clockwise or counter clockwise.

But "eh" you say and you're right there too. My son's family has very few clocks in their house and they are all digital. The grand kids are puzzled by the terms "clockwise" and "counter clockwise". And we talk about cyclones and some winds go clockwise and others counter clockwise. Eh? "And why do we "dial the phone number?" What dial?" Kids these days......
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Old 11-26-21, 04:41 PM
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Originally Posted by noobinsf View Post
Yep, normal. French thread DS tightens to the right, and those are the ones that work themselves loose.
... as do the Italian ones. Been there ... done that. That's what LocTite blue is for.

The sole benefit of French or Italian BB threading is that you can install adjustable cups on both sides and finetune your chain alignment.

Jimmy Thompson's collection of two dozens Hetchins bicycles did include one specimen in which the BB had been threaded backward, so someone assembled it with a fixed up on the left and an adjustable cup on the right, and evidently hoped no one would notice before it was sold. Talk about a "factory defect." And the Brits never shipped wine corks in their bike boxes, like some workers at Peugeot did.
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Old 11-26-21, 06:13 PM
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Originally Posted by Prowler View Post
Of course all this is doomed by our word choices. I'll never understand why we choose "right" and "left" for a circular motion. If someone holds the wrench above the cup one answer is correct and if they hold the wrench below the cup the other answer is correct. And then we get into "right is right and left is wrong". Sheeeeesh. So simple to say clockwise or counter clockwise.

But "eh" you say and you're right there too. My son's family has very few clocks in their house and they are all digital. The grand kids are puzzled by the terms "clockwise" and "counter clockwise". And we talk about cyclones and some winds go clockwise and others counter clockwise. Eh? "And why do we "dial the phone number?" What dial?" Kids these days......
I often ponder things like this. I came to some sort of conclusion that clockwise is 'right' because if you put a wheel on the ground and turn it clockwise it will travel to your right. Flimsy I know, and I don't know how many times I get it mixed up trying to true a wheel.

While clockwise and counter clockwise (or anti clockwise) is universally accepted, I do have a problem as an Australian that, if clocks were invented in the southern hemisphere, the hands would turn in the opposite direction.
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Old 11-26-21, 07:15 PM
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Originally Posted by Prowler View Post
Of course all this is doomed by our word choices. I'll never understand why we choose "right" and "left" for a circular motion. If someone holds the wrench above the cup one answer is correct and if they hold the wrench below the cup the other answer is correct. And then we get into "right is right and left is wrong". Sheeeeesh. So simple to say clockwise or counter clockwise.

But "eh" you say and you're right there too. My son's family has very few clocks in their house and they are all digital. The grand kids are puzzled by the terms "clockwise" and "counter clockwise". And we talk about cyclones and some winds go clockwise and others counter clockwise. Eh? "And why do we "dial the phone number?" What dial?" Kids these days......
I guess when I orient top dead center, the direction I go from there when going clockwise is to the right. “Righty tighty, lefty loosey,” and all that. I agree, this is one of the essential life skills my kids won’t get unless I teach them myself. We have analog clocks and watches all over the place, and they know their clockwise from anti-clockwise.
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