I'm using some Dura Ace SL-7700 downtube shifters on my road bike. I bought them NOS. The right (rear) shifter has the D-ring for switching from SIS to friction mode. It's a bit strange that the user manual didn't include mention of the friction mode, and while the D-ring on the shifter itself does have the little triangle marker that points to "SIS" stamped on the lever, the lever doesn't have 'Friction" stamped a quarter-turn away like it does on my older 8-speed shifters with the same feature. Yet, if I turn the D-ring a quarter-turn, just like with my 8-speed, I get friction mode.

However, I feel like the friction mode doesn't have enough friction. The front (left) shifter has plenty of friction, and it is easily adjustable by turning the D-ring. What do I do to increase friction on the rear (right) shifter if the D-ring is used to change between SIS and friction modes?

1 Answer 1


There should be a screw opposite the D-ring that you can tighten down to increase the friction on the shifter. On a shimano shifter a flat head driver should be used, but you can use something like a dime if you're in a pinch.

  • Are you referring to the large bolt/screw that passes through the center of the shifter barrel and attaches it to the frame of the bicycle? In the linked photo, it is a flathead screw on the right shifter, partially obscured by the D-ring. That is the only screw of any kind that I see. Mar 12, 2018 at 15:50
  • What's on the other side of the shifter? If that's the only screw then it's probably the correct place to make the adjustment. Since it's indexed that may adjust the indexing. Mar 12, 2018 at 21:46

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