The 9 Best Chain Breakers
Editor's Notes
April 09, 2020:
Added the ABN 9086.
You'll want to choose a chain breaker to fit the sort of chains you normally work on. Besides the pin sizes, some of the large breakers like the ABN 9086 are great for industrial chains but overkill and uncomfortable to use on small bicycle chains. The Pro Bike Tool is perfect for bicycle chains, not just because it is just the right size but also because it includes an all-metal body and handle. You'll want to stay away from models that have plastic handles mated to metal treads as this builds in an obvious failure point (this is true with tools generally).
I know that it is common and sometimes advisable to grind down pin heads with a flap wheel since this makes it less likely that you'll break a push pin - this is because staked pins have rolled-over edges that force the link face and the push pin to take undue pressure. Before doing so, check your particular chain breaker's manual since many manufacturers advice against it and have built the tool to deal with both pressed and staked pins.
Always lubricate any threaded drive tool to ensure smooth operation and reduce the likelihood of cross-threading or binding.