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amey-
Ah thought they were way more pricey - will have a dig cheers
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you get a clutch for running 1x
You also get a dérailleur geometry which is a worse match for a race cassette. The chain is always going to be pretty well controlled on a short cage RD with only enough slack chain to accommodate a 23T big sprocket, getting a clutch doesn't seem like a priority when it comes at the cost of slower shifts.
Ottomanotter
gbj_tester
Are there benefits to the RX even when running a 11-23 cassette/time trial set-up? I know little about di2 kit but thought the RX kit was the mountain bike cross-over for wide range cassettes...