• A real question now; I'm putting this 105 on a 2012 Charge Filter frame with the old school CX toptube to seatstay rear derailleur cabling, so do I need to bother with the special 24cm long super flexible OT-RS900 housing per the dealer manual or will good old SP41 cut it as it should run into the RD without crazy bends?


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  • SP41 will be fine. I've never used the OT-RS900 bit, usually because my bikes with mechanical shifters have full length outer cables so it doesn't really fit. Never had a problem. It's a solution looking for a problem unless your frame results in really awkward cable runs.

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