Giant Roam/Acera Triple set up problems
05-12-24, 05:23 PM
#1
Senior Member
Thread Starter
Giant Roam/Acera Triple set up problems
Saved from a dumpster, good shape save for a rusty chain. The front derailleur had slipped down. With chain off moved the derailleur up for big ring clearance. A visual check show that in the small chainring I am lined up. But when I move the shifter to middle ring the cage sits between middle and big ring. Push it again and it lines up with the big ring OK. What am I missing on this set up?
__________________
"It's a fine line between absolute genius and sheer stupidity"
"It's a fine line between absolute genius and sheer stupidity"
05-12-24, 06:23 PM
#2
Senior Member
Join Date: Apr 2016
Posts: 1,413
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 561 Post(s)
Liked 502 Times
in
382 Posts
Saved from a dumpster, good shape save for a rusty chain. The front derailleur had slipped down. With chain off moved the derailleur up for big ring clearance. A visual check show that in the small chainring I am lined up. But when I move the shifter to middle ring the cage sits between middle and big ring. Push it again and it lines up with the big ring OK. What am I missing on this set up?
05-12-24, 06:57 PM
#3
Senior Member
Join Date: Jul 2015
Location: NW Oregon
Posts: 2,995
Bikes: !982 Trek 930R Custom, Diamondback ascent with SERIOUS updates, Fuji Team Pro CF and a '09 Comencal Meta 5.5
Mentioned: 15 Post(s)
Tagged: 1 Thread(s)
Quoted: 1306 Post(s)
Liked 750 Times
in
543 Posts
leave some slack in the cable when the derailleur is in the small ring position, and the shifter is shifted to "1" position...
it may take a try or three to get it right, but that is what it takes... it is, quite literally, the ONLY way to adjust the middle ring Der. position.
i leave the cable adjuster on the shifter at one to 1.5 turns out from fully seated before any Fine tuning adjustments, then use the cable only to set the Middle ring position....... this reserves a bit in both directions to be used for the final fine tune, if needed
the stop screws set the low gear and high gear der. positions... the cable sets the middle gear position.
proper big ring teeth tips-to-der. cage bottom edge is 2mm or so(1/16" to 1/8" works ok. for the metrically-challenged)... are there any marks in the paint on the seat tube of the frame from where the der. was originally?
it may take a try or three to get it right, but that is what it takes... it is, quite literally, the ONLY way to adjust the middle ring Der. position.
i leave the cable adjuster on the shifter at one to 1.5 turns out from fully seated before any Fine tuning adjustments, then use the cable only to set the Middle ring position....... this reserves a bit in both directions to be used for the final fine tune, if needed
the stop screws set the low gear and high gear der. positions... the cable sets the middle gear position.
proper big ring teeth tips-to-der. cage bottom edge is 2mm or so(1/16" to 1/8" works ok. for the metrically-challenged)... are there any marks in the paint on the seat tube of the frame from where the der. was originally?
Last edited by maddog34; 05-12-24 at 07:09 PM.
05-12-24, 07:03 PM
#4
Senior Member
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 39,048
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 141 Post(s)
Tagged: 1 Thread(s)
Quoted: 5967 Post(s)
Liked 2,876 Times
in
1,601 Posts
From your description, it MAY be that the FD is over travelling with respect to cable inputs.
Before doing anything else, eyeball where the cable is attached. If, for example the cable is attached on the inboard side of the pinch bolt, that changes the leverage and can cause over travel.
If the cable is correctly attached, and the lever and FD are properly matched, you might try trimming based on the middle ring, and using the limits to set inner and outer trim.
I'm not a fan of using the outer limit this way for motlre than 1mm or so because it can cause other issues, but you can try and see.
Before doing anything else, eyeball where the cable is attached. If, for example the cable is attached on the inboard side of the pinch bolt, that changes the leverage and can cause over travel.
If the cable is correctly attached, and the lever and FD are properly matched, you might try trimming based on the middle ring, and using the limits to set inner and outer trim.
I'm not a fan of using the outer limit this way for motlre than 1mm or so because it can cause other issues, but you can try and see.
05-12-24, 07:04 PM
#5
Senior Member
Thread Starter
Got it. Will try cable adjustment on this. I peeled off the bashgaurd too. It was not helping see the alignment
__________________
"It's a fine line between absolute genius and sheer stupidity"
"It's a fine line between absolute genius and sheer stupidity"
