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What are those grey, turnable things on my 105 gear cables?(6 posts)

What are those grey, turnable things on my 105 gear cables?boy nigel
Jun 17, 2001 9:59 AM
I've got last year's Shimano 105 components on my TCR2 (2000 model). Since I've gotten the bike, however, I've been a tad puzzled by these 1-1/2", grey, knurled, plastic knobs (?) located on the gear-shift cables close to where the cables leave the shifters. They're turnable, but I haven't wanted to turn them much, in case they're designed to take up cable slack or something (which would alter my shifting). I haven't noticed them on other bikes yet, and am curious as to what they do. I also can find nothing on them in my "Zinn and the Art of Road Bike Maintenance" book. Something unique to the gear cables on my bike (made by Jagwire), possibly, or just some stock thing?

Anyone out there have anything similar? What do they do? Anything?

re: What are those grey, turnable things on my 105 gear cables?Spiderman
Jun 17, 2001 10:15 AM
i don't where exactly you are talking about, but they are either the adjust barrels which adjust eh cable tension. If they are on the downtube, sort of in the area where the old downtube shifters are, i have no idea. I have seen them on other 105 stuff and some ultegra. i have never looked closely at the Duraace stuff so i dont know but it sounds like it is unique to shimano. So the answer is, i have no idea.
tension adjustersDog
Jun 17, 2001 10:24 AM
I'd bet your bike does not have mounts on the downtube for downtube shifters, to which many manufacturers mounted cable adjusters with integrated shifting. Many makers now just mount cable stops near the head tube instead, with no way of mounting adjusters there. So, needing some readily accessible means of fine tuning the shifting while riding, they are including the barrel adusters right in the cable near the shifters.

Ah-ha! So I can adjust/correct my shifting on the fly, then?boy nigel
Jun 17, 2001 10:44 AM
Hi Doug,

Great to see that you've returned to the board as of late, and that life's treating you well.

You're correct: my Giant TCR has cable stops mounted on its head tube, with nothing on the downtube at all. So these two long barrels can be used for on-the-fly shifting corrections and cable tension adjustments?

Glad I asked! Would these do the same thing as the barrel adjuster at the rear of my rear derailleur?

Thanks again,
Jun 17, 2001 10:53 AM
same thing; I usually start the adjusters almost full de-tensioned, except for one turn. More likely the cables will stretch and need more tensioning.

Play with them to see what they do. Won't hurt anything, as long at the stops on the derailleurs are set right, and you can get them back where they were.

Barrel nuts for cable adjustment. nmLive Steam
Jun 17, 2001 10:46 AM