If by bigger chains you mean a 3/16" freestyle bmx chain, then you'll need something like the Park CT-7 to get it apart. I think Pedros makes a similar chain tool as well, but neither one is particularly cheap. I have a nice-ish Shimano one that handles 1/8" and 3/32" chain well, but it won't do 3/16"... I found that out the hard way. I don't think there are any standard chain tools that will handle both the beefy freestyle chains and the smaller road/derailleur chains, plus as far as I know none of the ones designed for 3/16" chain will work with 3/32" chain. I could be totally wrong though.

If you're talking about a 1/8" bmx/track chain, then any decent quality, not pocket-sized chain tool should work a-ok.


m.