Technical FAQ: Rebuilding Dura-Ace shifters

  • By Lennard Zinn
  • Published Sep. 9, 2009
  • Updated Nov. 12, 2009 at 10:37 AM EDT

Dear Lennard,
Are Dura-Ace ST-7700 shifters able to be rebuilt? My rear shifter has difficulty up-shifting. It takes sometimes as many as 10 shifts to move one gear. As per Shimano’s advice, I removed the shifter, soaked it in degreaser for three hours, air dried, and lubed the insides with TriFlow by inserting a tube into the shifter. It still doesn’t work.

Dear Aaron,
No, they cannot be rebuilt.

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Lennard Zinn

Lennard Zinn

Our longtime technical writer joined VeloNews in 1987. He is also a framebuilder, a former U.S. National Team rider, and author of many bicycle books, including Zinn and the Art of Mountain Bike Maintenance and Zinn and the Art of Road Bike Maintenance, as well as Zinn and the Art of Triathlon Bikes and Zinn's Cycling Primer: Maintenance Tips and Skill Building for Cyclists. He holds a Bachelor’s degree in physics from Colorado College. Readers can send brief technical questions to Ask LZ.

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