Originally Posted by
SkyDog75
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The most evenly-spaced 28-tooth cassettes I can find are the 11-28 Shimano CS-HG50 and CS-HG51 that csport recommended. Their spacing is 11,13,15,17,19,21,24,28. It's all two-tooth jumps until you get to the two largest cogs.
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My SRAM PG950 has a similar layout except an extra 12T gog (it's a nine cog cassette). I like the spacing and the switch from 11-26 to 11-28 made a difference going uphill on headwind near the end of my ride.