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Alloy pulleys will wear the chain a tad quicker, but not significantly so. IE orders of magnitude less than a neglected drivetrain VS a well-kept one. Speaking of clean drivetrains, good maintenance is key, as once the anodisation is gone, the wear rate on those alloy pulleys accelerate dramatically.
I honestly wouldn't bother, from a durability point of view.
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Have a look for KCNC jockey wheels as they make a 13t .. But as Kimmo said alloy jockey wheels do then to be noisier then plastic
Pish
user87951
@giofox
Need to replace GRX RD jockey wheels again (these ones lasted almost 4000km as opposed to the 1500km winter kms it required to get the last pair to look like shurikens)
Once again I am considering if it's worth it to invest in premium alloy jockey wheels. GRX are nice and have sealed bearings, so, good on that, but they seem to wear quickly. Will alloy jockey wheels accelerate the wear on the chain? Be noisier? Will they last so long to the point I have to replace the bearings in them to extend the life?
Furthermore, I can't seem to find any alloy jockey wheels with 13t, but only 11t or 12t. I have the RD-RX810 model (same as RX815 but mechanical, officially rated for 34t cassette) which carries a 13t lower jockey wheel, as opposed to 2x11 used on RD-RX812 (and 817)
I imagine the RD works just fine with 2x11t and the 13t is simply because there is more room (due to having to retain less chain), can someone confirm this? Can I use a 11+12t combo? Any other ideas?
#firstworldproblems