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Peugeot crank arm mixed with BSA? Is that possible or destructive/unwise?

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Peugeot crank arm mixed with BSA? Is that possible or destructive/unwise?

Old 10-01-16, 07:29 AM
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Peugeot crank arm mixed with BSA? Is that possible or destructive/unwise?

I bought late 70s Pug 5turn7 gear last week. I noticed today whilst unlocking my bike that one crank arm has BSA engraved. Am I right into thinking someone blended BSA crank bottom bracket and attached the Peugeot left crank arm? Is this mechanically possible without modifying the hole which the bottom bracket goes through? If true then one arm has English pedal thread the other French? This is a lot of information to know for a laymen average Joe like me buying bikes from Gumtree/Craig's list/eBay. I'm left to presume the person that made the changes knew what s/he was doing? I would love to go to a vintage Peugeot bike show and asks long time enthusiasts all sorts of questions and see why people modify certain parts if not broken. I'm come from the camp to keep as much as original parts as much as possible on vintage bikes to keep some value?
Update: Please see photos. The arm attached to cassette is BSA. The left arm has Peugeot written on it and has the word Japan on the back. The pedals are unmarked.
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Old 10-01-16, 07:37 AM
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Just because the bike is French does not mean that the pedals are French. Later Pugs came with english threaded crank arms; plus it's pretty easy to tap out a crank from French to BSA.

What the heck is a 70s Pug 5turn7?
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Old 10-01-16, 08:08 AM
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Originally Posted by drewrockstarr
I bought late 70s Pug 5turn7 gear last week. I noticed today whilst unlocking my bike that one crank arm has BSA engraved. Am I right into thinking someone blended BSA crank bottom bracket and attached the Peugeot left crank arm? Is this mechanically possible without modifying the hole which the bottom bracket goes through? If true then one arm has English pedal thread the other French? This is a lot of information to know for a laymen average Joe like me buying bikes from Gumtree/Craig's list/eBay. I'm left to presume the person that made the changes knew what s/he was doing? I would love to go to a vintage Peugeot bike show and asks long time enthusiasts all sorts of questions and see why people modify certain parts if not broken. I'm come from the camp to keep as much as original parts as much as possible on vintage bikes to keep some value?
Photos?

If it is a square taper bottom bracket, then the bottom bracket remains the same, and different crank arms can be used either unmodified, or with minimal modification.

French cranks can be tapped to work with English pedals, or perhaps even have English pedals forced into them.
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Old 10-01-16, 08:36 AM
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For the US market, Peugeot eventually switched to ISO/BSA (9/16" diameter) pedal threading, because too many dumb Americans were stripping crank threads. The worst case was putting French-thread pedals into ISO cranks -- they went in very (too) easily, wobbled around, and eventually fell out as the threads failed. I saw a few cases of this when I worked at a Peugeot/Nishiki dealership in the early 1970s.

In contrast, my 1980 PKN-10 came with ISO-threaded Stronglight cranks.
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Old 10-01-16, 10:29 AM
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Thank you all again for your wisdom. 70s Pug I was referring is the bike in the photo. It had 5 gear but local LBS replaced it with 7 gear sprocket. This is the bike with two different crank arms
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