Shimano SL-7700 9 Speed down tube shifter.
03-09-24, 12:20 PM
#1
Newbie
Thread Starter
Shimano SL-7700 9 Speed down tube shifter.
I have had these on my bicycle for fifteen years. I think I tried them in SIS mode a long time ago, but they have pretty much always been on friction mode. I have an itch to try them in SIS mode, but I don't think they want to switch. I think that I remember that you twist the bail and move the arrow from FRICTION to SIS to make the change, but the bail doesn't want to move and FRICTION must have been rubbed off by many thousands of shifts because it's not there anymore. Do any of you mechanics think this is just stuck due to age and that I'd be better off leaving it alone, or is there a trick that I don't remember.
03-09-24, 12:49 PM
#2
Senior Member
Join Date: Dec 2020
Location: Wake Forest, NC
Posts: 5,794
Bikes: 1989 Cinelli Supercorsa
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 3513 Post(s)
Liked 2,927 Times
in
1,776 Posts
Probably just stiff from lack of use. I’d shoot a little WD 40 in there to see if it loosens up. There’s no real trick to turning the D ring.
03-09-24, 01:07 PM
#3
Senior Member
Join Date: May 2010
Location: Bastrop Texas
Posts: 4,481
Bikes: Univega, Peu P6, Peu PR-10, Ted Williams, Peu UO-8, Peu UO-18 Mixte, Peu Dolomites
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 967 Post(s)
Liked 1,631 Times
in
1,047 Posts
I have not yet successfully used SIS mode; however, I have never had matching components. For example a matching, SIS Shifter, SIS Derailleur, and SIS Freewheel... SIS Chain?
After many many hours and attempts its a real admission of failure.
After many many hours and attempts its a real admission of failure.
__________________
No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)
No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)
03-09-24, 01:17 PM
#4
SE Wis
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 10,516
Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970
Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 2747 Post(s)
Liked 3,401 Times
in
2,058 Posts
Might need to tweak things a bit to adjust SIS shifting once it moves.
