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flight deck st 4400 shifter not working. I have sprayed it and a man said is was US. What other shifters can I use new or used. I do not need the electrics cheers Steve

  • rh 9 speed double – steve edney Mar 8 '18 at 7:04
  • Then you need a 9 speed brifter given its the right-hand one. Given your current one is unserviceable, I'd recommend opening it and having a go. You might be pleasantly surprised if it comes back to life. Have a look at this linked video bicycles.stackexchange.com/a/37060/19705 – Criggie Mar 8 '18 at 8:38
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It's my understanding that all Shimano shifters below 11 speed ([except ST-4700][1]) use the same cable pull ratio. This means you can use any Shimano 9 speed rear brake/shifter unit.

Tiagra ST-4400 obviously and ST-4500, and Sora ST-3400 and ST-3500.

The newer Sora may be as good as the older Tiagra. Some googling and looking on Ebay may yield a replacement matching ST-4400. Or you maight choose to upgrade both brake/shifter units.

  • Thanks so much Argenti,I had a friend dismantle and reassemble but now no go at all. Do you have a complete breakdown of the parts plates and springs so I can clean and reassemble. It appears there is nothing at all broken he said,thanks so much Steve. – steve edney Mar 13 '18 at 8:56
  • That probably should be asked as a separate question as this site is not supposed to be used like a discussion forum - but - Shimano has a tech docs site, I searched for 'ST-4400' and came up with an exploded parts diagram that may help you. Searching on YouTube for someone repairing a shift unit may also yield results – Argenti Apparatus Mar 13 '18 at 15:20

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