Joined: Feb 2006
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From: Lake Geneva, WI
Bikes: Ridley Helium SLX, Canyon Endurance SL, De Rosa Professional, Eddy Merckx Corsa Extra, Schwinn Paramount (1 painted, 1 chrome), Peugeot PX10, Serotta Nova X, Simoncini Cyclocross Special, Raleigh Roker, Pedal Force CG2 and CX2
Typically half-step gearing has two chainrings with a 3, 4 or 5 tooth difference. The cassette would also need to have a 2 or 3 tooth difference in the progression.
You could do an 11-13-15-17-20-23-26-30 cassette with a 49 & 46 chainring combination, it's not ideal, but that would work. I'm not sure you would like it in a hilly area.
I think what you are really inquiring about is chainring selection, not half-step gearing.
In that case, a 49 & 34 chainring set is a good choice.
Last edited by Barrettscv; 02-24-19 at 02:32 PM.