Originally Posted by CrimsonEclipse

When installing a chain, which is stronger: Pressing the pin with a chain tool or a quick link?

I had a chain break on me twice and I'm not sure if it was due to luck or my press in pin was a weak point.

Originally Posted by CrimsonEclipse

9 speed.

I had recently checked it for chain stretch, and it was still well within limits even though it has thousands of miles on it.

Getting a new chain (2 breaks is enough) and cassette too.

Originally Posted by 3alarmer

.
...quick links seem to work pretty well for me. Not sure what you mean by a "press in pin" ? The newer chain pins are often peened, so when you press one in and out again, it enlarges the plate hole and can lead to failure. I know Shimano had those press in and break off pins, but you're not supposed to break the chain in the same place twice, for this same reason. I stopped using Shimano chains for this reason, so I'm not up on what they sell now.