June 13, 2025
The Stronglight on the Peugeot PX-10 is "interesting".
The right side (with the chainrings) is bigger and needs a 23.35mm extractor. Lucky for me I have one, that I bought over 30 years ago.
The left side uses the standard 22mm extractor. I purchased a Park Tool CWP-7 extractor for this, and it works like a charm. What a nice tool.
My dust covers are both long gone. Both left and right bolts are right hand thread and need a 16mm socket. I could get a standard socket on the right side with the bigger 23.35mm hole, but on the left side I had to use the special tool that came with my 23.35 extractor. It I hadn't had this, I would have had to put a 16mm socket on my lathe and turn down its outer diameter until it would fit (or find a very thin walled socket)
When I put calipers on the Park Tool CWP-7, I measure 21.84 mm on the outside of the threads. When I measure my special right side extractor I get 23.24. This is as it should be as threads can't fit perfectly tight and be useful, as every machinist knows.
There should be a washer under the bolt to protect the alloy crank arm. And it should be chamfered where the bolt face meets it.
Torque the crank bolts to 40-50 N-m (45 N-m is 33 ft-lbs). Some say 29-37 ft-lbs. Absolutely put grease (or better, anti-sieze) on the bolts
Some say not to put grease on the axle tapers. This is apparently an ancient topic for debate. I vote for a very thin film of anti-sieze.
Tom's bike pages / tom@mmto.org