> 24/38/48 was default gearing for triples back in the 7 and 8 speed days; > well, perhaps 24/36/46 was more typical but I used the former with no > problem. > > My question was: Do wide (11-12-13 cog) cassettes with the wider chain > angles tend to throw chains off of the grannies in triple ring setups? But > how common can those be? No one in his right mind would need 3 rings with > 13 cogs -- I think. > > I have yet to see a triple ring setup with a 11s cassette. But the problem that most people are trying to solve is not enough low gears. Even though they've added speeds on the back, the moment you switch from a 1x drivetrain the maximum size of the large sprocket drops dramatically (no more 51t sprocket). I don't think you can use the 10-52 or 11-51 sprockets with 2x drivetrains --- neither Shimano nor SRAM will support it. The default drivetrain from Shimano is a 30/46 crank with a 11-36t cassette. That's still a higher low gear than a 40t chainring with an 11-51 cassette and nothing stops the 1x drivetrain user from switching to a 36t front chainring and getting even lower gears.
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