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I'm 95% sure 1:1 and Exact are different. And X-actuation is different again but coincidentally similar to 1:1. Don't buy something for 1:1 if your other stuff is Exact!
1:1 is a 1.1 shift ratio, Exact is 1.3, X is 1.12.
SRAM really dropped the ball with the naming of these different schemes, it's very confusing.
frankenbike
PhilDAS
yes
https://www.sram.com/sram/road/technologies/exact-actuation