Originally Posted by
Sy Reene
Who knows really what the difference is between the CL555R and non-R version. Even KMC's own website uses the same URL for the photo on both products. I would note that there is no such thing as a reuseable 11S Missing Link (per KMC) that is made for campagnolo chains for some reason.
M/L-11R - KMC Chain
YBN QRS-11 quick links are reusable (up to 5 times) and can be used with Campagnolo chains. I have a card of them but haven't tried them at this point so I can't say how well they work.
FWIW I've (re)used 11-speed KMC links several times on Campagnolo 11-speed chains with no issues.
To the OP's question, I've broken 2 quick links over the years, both on 9-speed chains. 1 was on my commuter, the link broke while shifting, and the 1 was on the mtn bike, the link broke after a particularly rough downhill section. In the case of the mtn bike I'm not so sure it broke as much as it came apart, but the road bike clearly broke. Both quick links were single use SRAM links that had been reused several times so I'm not blaming anyone except myself.