Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,193
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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Note that Shimano's/Campag's methods are only really applicable to gearing choices actually specified with the original complete groupsets.
For anything outside their ranges, you are on your own.
I always check the big/big chain length for general information, as well as the small/small. Longer chain often shifts best as mentioned by Salamandrine.