Peugeot PY10 frame /bottom bracket issues
 

Hi there,

I recently bought a supposedly PY10 frame off the bay with the (probably foolish) intent to build a usable long-distance bike from it. Now, to my mixed horror and joy, I discovered the bottom bracket doesn't appear to have French threading but rather BSA or swiss. Now the question is: which is it?

See pictures of the BB attached.

take the frame to your LBS .... they will tell you

If its not French its Swiss. Looks like someone may have fitted an incorrect thread BB.

Velo Orange to the rescue...

Threadless

Thanks for the common-sense reply! :thumb:
If the whole thing gets anywhere I'll post some updates.

You can tell quickly by test-threading an ISO adjustable cup into the left side of the BB.

With the usual caveat, my 1980 Peugeot PKN-10 was Swiss-threaded. I force-threaded an aluminum Sugino ISO fixed cup when I switched to a Sugino triple, and it has held nicely for more than a decade.

Testing the left side still might leave the question of whether it's French or Swiss.


I forced a Shimano BSA-threaded cartridge bb into my Swiss-threaded 1979 PX10 Super Competition. The cups were alloy thankfully so I was able to work them in with plenty of back/forth motion using a long breaker bar on the cartridge bb tool.

The Swiss fixed cup threads go the opposite direction from French fixed cups and goes the same direction as BSC fixed cup threads.....

Thanks for all the inputs!
I contacted the seller and he insists it's French threading. So will ask LBS if they have French BB cups later today. If not, it's the bike flea market on 15 Oct. or the Bay again.
Meanwhile, got a pleasant surprise. There's apparently a possibility to attach a derailleur hanger to the existing dropout. That could allow me to use a new (Shimano) derailleur after all.

Post your location. If you were in Tampa I could help out as I have French, Swiss and BSA/ISO BB's in a box. But....

You can get new BBs such as Phil, Velo Orange, etc to work with French or Swiss cups, whatever the bike has. If necessary of course!

The PKN-10/PY-10/PX-10 BBs were French-threaded until the very late 1970s, when Peugeot finally got it right (left?) and switched to Swiss. As you read, DDDD (1979) and I (1980) both encountered Swiss threading. Many cup manufacturers distinguished the LH thread on the fixed cup with either special markings or rim pattern or a bronze/gold color instead of the usual chrome/silver.

There is a Stronglight cup set in swiss on ebay right now...very reasonably priced. Axles to fit of whatever length you need are very easy to find and inexpensive...

I happen to have the threadless BB from VO that [MENTION=381793]gugie[/MENTION] mentioned that I am not going to use - PM me if interested