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John-The.Raven
Bought one of those jockey wheel extender cages from AliExpress on Christmas Eve, came on the 3rd of January which was pretty decent. It's a Rockbros one which cost £56 posted, much better than the £400+ of the Ceramic Speed OSPW, but still probably pointless and absolutely unnecessary.
Quality is decent, the SRAM versions have a 12t NW top pulley and 17t lower, bearings are full ceramic. Installation was really easily but does require the tension screw to be wound pretty much all the way in to clear my 26-28 cassettes. Couple of pictures below:
And on the bike, surprisingly quiet for alloy pulleys and the shifting feels better than the OEM pulleys, probably no difference though.