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I have a Giant Defy 3 which came with Shimano Sora groupset. A friend gave me some older Dura Ace 7700 components in good condition so I'm upgrading most of the components including brakes, shifters, and derailleurs. But the barrel adjusters are different so I'm not sure what the best option is here.

The Sora shifters are threaded for a barrel adjuster but the Dura Ace are not. Instead, my friend's Dean frame has threaded bumps brazed onto the downtube, and the adjusters thread into there. I have never seen this style before. My bike has a regular holder on the downtube for the shifter housing but it's not threaded.

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    Probably you can make do with the barrel adjusters on the derailers. Otherwise, use inline barrel adjusters. – Daniel R Hicks Sep 8 at 2:23
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    Adjustment for the RD of the 'upper' groupsets is done via the rear barrel adjuster. The cable needs to be manually pre-tensioned which might be a bit fiddly. – Carel Sep 8 at 7:40
  • Cable stops on the frame threaded for barrel adjusters were common on road bikes with external cables that didn’t use full length housings. – Argenti Apparatus Sep 8 at 17:05
  • Shimano had these 'Down Tube Fitting Shift Cable Adjuster (SM-ST74)' which are still available on some auction sites. The downside however is that they are meant to be fitted to attachment bosses for downtube shifters. And they are quite expensive! – Carel Sep 9 at 12:11
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Jagwire along with others manufacture in-line barrel adjusters. As the name implies they are installed between two sections of outer cable housing. They are generally installed 6-10 inches from where the cable exits the shifter. You want it close enough to the bars to be able to make adjustments while riding.

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