"Crossover Gearing
This refers to a derailer gear system in which the jumps between chainwheel
sizes are approximately the same as the jumps between adjacent rear sprockets.
This type of gear setup provides a particularly simple shifting pattern,
requiring no double shifting at all, but at the price of creating a large
number of duplicate gears, and limiting either the overall range of gears or
the closeness of spacing." St. Sheldon.
So if I understand Mr. Brown correctly, using a 9-spd cluster with crossover
gearing I functionally get 10 ratios. And that doesn't consider cross-chaining.
So why not just go for a single chain wheel and keep it really simple. I'll
probably use only one chain wheel most of the time anyway.
With a half-step I have 18 distinct gears! (Again ignoring cross-chaining.) I
ride mostly in the middle ring, but, if I want to fine tune, the option is
there. With a crossover, oh well.
I'm not saying that the typical crossover setup is wrong. But I do believe many
dismiss a superb option out of tradition and habit. But what it really comes
down to is use whatever makes you happiest. For me, I'm a half-stepper of over
four decades now. And I'm well content☺️
Cheers!
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