Originally Posted by
cyccommute
This is one of the things that bothers me about people who say to use a 12” rule. Yes, a chain is “exactly” for 24 links...although how much variation is in that measurement. But if you are trying to be so accurate, how do you measure about 3/32” on a rule that is only 12” long? That is as much of an estimate as the chain checker tools give. “When 1/2 of that pin is exposed” is even less accurate.
I prefer a tape measure, or the Park spoke gauge (with ruler) I mentioned before, for these reasons. Of course, with a little bit of looking you can find a 15" steel rule. If you've got the time to worry about the accuracy of these tools, you've got the time to find one of the 15" rules.
It's going to be a long winter...