From Sheldon Browns site:
Originally Posted by The Master, Sheldon Brown
These YST bottom brackets fit any threaded 68-70 mm shell, and do not use the existing threads.
The main unit slides in from the right side, and there is a conical lockring that screws in from the left. Uses standard Shimano splined tools.
Uses standard industrial 61903 bearing cartridges, secured by snap rings.
Note! Your frame must be modified (chamfered/countersunk) to permit one of these bottom brackets to be installed. This requires an expensive special tool that your local bike shop may or may not have available (same tool used for Mavic and Schlumpf bottom brackets.)
Once the frame has been modified, a standard bottom bracket will no longer fit.
We were initially very excited to get these in, but we found that the quality was too erratic, so we no longer carry this product.
Having to mod the frame is a big requirement. The bottom bracket is of questionable quality. Sounds like a crap shoot.
Have you absolutely determined that a french thread is required? A lot of Pugs, especially those produced in the 80's and beyond used British.
This is Africa, 1943. War spits out its violence overhead and the sandy graveyard swallows it up. Her name is King Nine, B-25, medium bomber, Twelfth Air Force. On a hot, still morning she took off from Tunisia to bomb the southern tip of Italy. An errant piece of flak tore a hole in a wing tank and, like a wounded bird, this is where she landed, not to return on this day, or any other day.
Last edited by dobber; 01-15-08 at 01:54 PM.