I dusted off an old steel frame french road bike (circa 1980) and have been enjoying the summer riding so far. Unfortunately I managed to snap the chain on it. No big deal, put a measuring caliper on it and read off 1/2" pitch and 3/32" width. Went to the local bike shop and picked up a cheapo SRAM chain and put her on.
Now the chain skips every 2-3 revolutions. It turns out the pitch isn't 3/32" but slightly smaller, causing the chain to slip. This leads me to think that the old french chains are a non-standard size. Or has the original chain stretched over the years? Is there any way of finding a replacment chain for it or do I need to update the chainring/cassette for something more modern and compatible? Seems a shame to do away with the original parts.
Anyone out there have experience of doing up old french bikes and may have some knowledge?