Originally Posted by
ericm979
when you don't need an 11.
a 11-25 has 11,12,13,14,15,17,19,21,23,25
a 12-25 has 12,13,14,15,16,17,19,21,23,25
That 16t cog that's on the 12-25 is awfully handy. The 11-25 has a large gap from the 15 to the 17. So if you're riding at a speed where the 16t cog would be ideal, you have to either turn the pedals faster on the 17t, or slower on the 15t. If you don't use the 11t then using a 12-xx cassette would avoid this problem.
But what if i'm riding at a speed where 18 would be ideal? Can't they wedge four more cogs in there so I never have to face that problem?