Originally Posted by
cooleric1234
Why do you prefer a ruler? I have a chain checker, I just need to take a look at my chain.
I don't necessarily want a 12-23, it just seems that as I'm looking at cassettes sometimes a 12-25 option doesn't exist and the closest one is 12-23. I should say the closest one with a smaller big cog. I have a triple now but I'm trying to build up enough strength so that I can get by with a compact double for my next bike. This will be for the lighter wheelset I just bought and the one I'll use in the mountains so I might like to train myself with a little tougher gearing.
If you change from a triple to a compact double chances are you'll want a larger big cog instead of a smaller one. Of course this all depends on where you ride and your physical conditioning. But going from a 30t granny on the triple to a compact with a 34 is a big change. If you're doing mountains with a compact double you may want a 12-27.