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frankenbike
gbj_tester
All they've done is to revert to the Lucien Juy pattern, which always worked as long as you matched the pulley cage geometry to the cassette slope and didn't mess it up by using more than one chain ring. The Suntour slant parallelogram copes well with multiple chainrings but the parallelogram slant has to match the cassette slope, which starts to become difficult when the ratio of biggest sprocket to smallest becomes as large as it is on these modern 1×11 and 1×12 systems.