Originally Posted by
kmart
On the flip side, you may find that your current ratio is too high and adding one tooth on the cog gives a ratio that is too low. Because 1 cog tooth equals about 3-5 chainring teeth, you have finer control of the gearing if you swap the chainring. Also chainrings are easier to swap than cogs, unless your cog is not on tight enough to begin with.
i disagree, rotafixing is about the easiest thing ever and works to get a cog on and off pretty easily. I think easier than getting equal tension of 5 bolts and dealing with reinstalling cranks. Plus all you need is a lockring tool and your bike for rotafixing. Although you're point on fine tuning gearing is 100% on.