Originally Posted by
1speeder
One needs to watch out now a days on chain sizing. If all of your bike components match then this method way may work.
The Campagnolo method results in the longest chain length compared to the SRAM/Shimano methods so you're least likely to rip the RD off on the big-big combo. In theory it also results in less friction. Since I replace my own chains I also find it pretty easy to do. It's just a way to size to the chain, it has nothing to do with what brand of chain you use or what group set you run.
Also, it's not all
that hard to spot a short chain before it turns into catastrophe. If you run multiple cassettes and want to be safe I'd size the chain to the cassette with the lowest granny gear.