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With hindsight i probably should have just changed the jockeys for some nice ceramic ones. Even the Token hybrid ones i had before on another bike seemed like a decent improvement on the stock ultegra wheels. I was just cleaning up my 7 year old Record rear derailleur yesterday for another build which has a stiff carbon cage and the ceramic bearings are still spinning 90% like new now. I only ended up ordering this one as it popped up on my suggestions and i thought it would look good on my carbon everything Tri bike and its pretty much the only part i haven't fiddled with on it yet. It wasn't mega expensive but still more than nice new jockeys. I thought it should save a watt or 2 if I'm lucky as well. I'm hoping to get it on today and give it a spin then I'll review my options.
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Retro_Bastard
Why not just get the biggest pulleys you can jam in the stock cage.
That's 12/14t there... Fit in 10s Red cage with no modification, but had to hack the pins on the 9070. Gives some improvement and looks way better than the goofy and expensive aftermarket cages IMO.
Found the pulleys on eBay, IIRC... These ones are narrow/wide. Resin is the go, ally ones are noisy.
Part of why I reckon it looks better than stock is the extra clearance has been fettled away; the pulleys barely miss each other.