It's not the chain itself I was thinking about, but rather what cogs will work with what chain rings to get my tension close enough that a 1/2 link could make it close to perfect. I had read that unless the tension is perfect, the chain will derail if you hit a bump or something, but another poster hear is saying that it is not as critical as chainline so I will just try to get it as close as I can. The bottom line is I don't have horizontal dropouts, I don't want to spend the cash building up an Eno-hubbed wheel and I don't want a Singulator type device to replace the derailleur I just got rid of so I was looking for the best way of eliminating chain sag with just chain link & cog adjustments.