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Finally got my old Shimano 105 derailleur dialed in after a week of messing with it
Honestly, I was about to give up and take it to the shop. I kept adjusting the high limit screw but the chain kept jumping off the big ring. Tbh, the trick was setting the B-tension gap to exactly 6mm with a hex key, which I saw in a Park Tool video. Has anyone else found that one tiny spec makes the whole thing work?
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nelson.michael6mo ago
Yeah, that B-screw gap is a game changer. I fought with my Ultegra for days before I checked that.
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mark496mo ago
Seriously? The B-screw gets so much hype. I've set up a bunch of 11-speed stuff and just eyeballed it. If the chain shifts smooth onto the big cog, you're basically done. People act like it's rocket science, but it's just a simple gap.
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