Suntour pivot rebuild- spring tension?
07-19-16, 07:55 PM
#1
Bench vise user
Thread Starter
Join Date: Jul 2015
Posts: 531
Bikes: 2004 Orbea Marmaloda, 1982 S12-S LTD, 1956? Maino, 1985 Sagres
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 79 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Suntour pivot rebuild- spring tension?
Hello all,
I have a 1985 Suntour AR GT rear derailleur. I went to regrease the pivot point where the pulley cage attaches to the parallelogram. The spring popped off before I could see which hole it had been in.
There are three holes, for low, medium, and high spring tension. I put it in the middle hole. Is that the correct one to use? Does anyone know?
If that was the wrong hole, what are the symptoms of too much or too little tension?
This is the derailleur in question. The big round plastic cap with a screw in the middle covers the pivot.
VeloBase.com - Component: SunTour aR GT
I have a 1985 Suntour AR GT rear derailleur. I went to regrease the pivot point where the pulley cage attaches to the parallelogram. The spring popped off before I could see which hole it had been in.
There are three holes, for low, medium, and high spring tension. I put it in the middle hole. Is that the correct one to use? Does anyone know?
If that was the wrong hole, what are the symptoms of too much or too little tension?
This is the derailleur in question. The big round plastic cap with a screw in the middle covers the pivot.
VeloBase.com - Component: SunTour aR GT
07-20-16, 06:42 PM
#2
Senior Member
Join Date: Feb 2008
Location: Peoria, IL
Posts: 4,476
Mentioned: 86 Post(s)
Tagged: 0 Thread(s)
Quoted: 1829 Post(s)
Liked 3,375 Times
in
1,580 Posts
"RJ the bike guy" has a decent video on youtube showing how to disassemble this style of SunTour and reassemble it.
I have some qualms with various details... such as where the grease needs to go, and how & why to tighten the little nut on the back of the upper pulley, but I think he got it right in regards to the spring for the pulley cage rotation.
Steve in Peoria
(been disassembling these SunTours since the 70's)
I have some qualms with various details... such as where the grease needs to go, and how & why to tighten the little nut on the back of the upper pulley, but I think he got it right in regards to the spring for the pulley cage rotation.
Steve in Peoria
(been disassembling these SunTours since the 70's)
07-21-16, 06:12 AM
#3
Senior Member
Join Date: Nov 2004
Posts: 23,223
Mentioned: 654 Post(s)
Tagged: 1 Thread(s)
Quoted: 4722 Post(s)
Likes: 0
Liked 3,036 Times
in
1,874 Posts
The middle hole is the nominal, factory setting. Perhaps they may have used a different setting if the assembler made an error or if they got a batch of stronger or weaker springs but you'd probably find that the middle hole was used 99.7% of the time.
07-21-16, 07:39 AM
#4
Senior Member
Join Date: Nov 2014
Location: Saratoga calif.
Posts: 1,049
Bikes: Miyata 610(66cm), GT Vantara Hybrid (64cm), Nishiki International (64cm), Peugeot rat rod (62 cm), Trek 800 Burning Man helicopter bike, Bob Jackson frame (to be restored?) plus a never ending stream of neglected waifs from the Bike exchange.
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 339 Post(s)
Likes: 0
Liked 632 Times
in
229 Posts
On the subject of suntour derailleurs, Is there any place that might sell parts and pieces?I have one with a broken spring.
07-21-16, 10:38 AM
#5
feros ferio
Join Date: Jul 2000
Location: www.ci.encinitas.ca.us
Posts: 21,796
Bikes: 1959 Capo Modell Campagnolo; 1960 Capo Sieger (2); 1962 Carlton Franco Suisse; 1970 Peugeot UO-8; 1982 Bianchi Campione d'Italia; 1988 Schwinn Project KOM-10;
Mentioned: 44 Post(s)
Tagged: 0 Thread(s)
Quoted: 1392 Post(s)
Liked 1,324 Times
in
836 Posts
It's like the old Huret Allvits, which had three windup spring tension settings, easily set externally using a pair of pliers. I used to fool around with those as a teenager and never saw much difference in shifting.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
