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UniversalDav-
One question...why the discrepancies in various peoples GI calculations? I know it changes with tyre/wheel size etc., but for the example of 49x15, if we assume 700c wheels and 23mm tyres, I get 85.93 on every calculator I try...I have to put down 32mm tyres to get close - don't really see them on track! In another example, 50x15 is oft quoted as 90 inches, while I always get 87.68.
Anyhow, I haven't changed sprocket or chainring in months (47x14, 88.3GI by my reckoning!) so I guess it doesn't matter!
SCS
What utter nonsense. The gear you choose should be based on you riding style and the events you are competing in. Generally training is done on a lower gear than racing and you'll often have a lower gear on for warm-ups.
As an example I ride:
48x15 (86.4") - warm up and some training
49x15 (88.2") - track league, training
50x15 (90") - track league
51x15 (91.8") - sprint, kilo (done a 1:08 kilo on that gear)
48x14 (92.6") - sprint, pursuit
47x14 (90.6") - track league / scratch race
There is no one gear fits all.