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Kimmo
gbj_tester
My point being that the 18/19 jump isn't worth having, but 18/20 is worse than 12/13 so we're stuck with it on drives which work well within the load and packaging requirements of a bicycle.
⅜" pitch chain would work, and apparently was used by Team GB on the track last time around, so you could switch the cassette from today's typical close ratio TT set of 11-23 to a 15-30 to get nicer chordal action and smaller ratio jumps at the top end. That would be much better from every aspect than a half-step, if you still think the 11/12 shift is too big.
It's not just 50g of chainring on a TT bike, it's changing from a clean 1× drive to a 2× with all the drag penalty of a FD and second ring