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The jockey wheels on my SLX mech have gone from new to ninja star pointy to rounded off pretty quickly. The lower pulley has also really worn in, it runs well off centre, it's so worn.
I'd rather get something with bearings that's not going to suffer so much (double chainset, long cage mech, so the tension is a *little* higher than on my old triple), and longer lasting material so long as it's not detrimental to the chain.
I think that Shimano have a patent on the guide pulley having lateral float or something.... but does that make a difference?
Cheers
I have BBB ones (i think) on mine, they're ok.
TACX, you can get them for about £10 & they last for yonks.
Ta, I was hovering over some Tacx bearing ones for a tenner one ebay. That's cheaper than the SLX or XT ones that are sold out everywhere 🙄
I've just pulled some BBBs out after the lower one totally seized a whole 2 months into use. That was one of the cheaper ones, maybe the ceramics are more reliable?
tacx user here = great stuff
paul
Tried KCNC stuff but it didn't last. Sent it back and the shop replaced with the ceramic ones. They were worse. Gone back to XTR again.