Front Derailleur/Fuji S12S/Sora/RSX
07-03-23, 02:31 PM
#26
Senior Member
Thread Starter
/I put a measuring stick on this. I need 10mm of FD throw to reach the big ring. But I only have 5-6 mm between small ring and frame. It's a no-go with this FD. I did a friction set up on older Gran Tour SE with a triple and Mountech FD. On this S12S I wanted to use indexed. Is there a FD with more throw outboard? He is old friction setup:
Friction setup. I need a FD that will extend and center at 55mm
Friction setup. I need a FD that will extend and center at 55mm
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07-03-23, 02:45 PM
#27
Senior Member
Well, now a new issue, FD still won't reach. I am looking at bottom bracket and I think I am out of room on the crank where it goes to bottom bracket. The Sugino seems to set too far inboard in the center. Looking at my spare RSX triple, the mounting point is more outboard. Pics show this. I am on a 110BB for the Sugino, their choice for road. The RSX is 113-118 and Sheldon says maybe as low as 107 on his site. Tight squeeze on this
You can see there is little room left here. maybe a few mm, but not enough before it hits the teeth on the BB
RSX is more recessed in the center of the crank and thus moving my rings inward
You can see there is little room left here. maybe a few mm, but not enough before it hits the teeth on the BB
RSX is more recessed in the center of the crank and thus moving my rings inward
Have you tried manually pulling the cage to confirm how far it will move outward? Have you checked that the cable housing isn't causing restricting the cable movement?
07-03-23, 02:51 PM
#28
Senior Member
Thread Starter
What is the current chainline on the Sugino? Sheldon's site shows you how to measure. Most Shimano road FDs for triple expect a 45mm chainline, but has some leeway in both direction.
Have you tried manually pulling the cage to confirm how far it will move outward? Have you checked that the cable housing isn't causing restricting the cable movement?
Have you tried manually pulling the cage to confirm how far it will move outward? Have you checked that the cable housing isn't causing restricting the cable movement?
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"It's a fine line between absolute genius and sheer stupidity"
"It's a fine line between absolute genius and sheer stupidity"
Last edited by etherhuffer; 07-03-23 at 03:32 PM.
07-03-23, 03:49 PM
#29
Senior Member
While in the small chainring & largest sprocket, set the low limit screw to have minimal clearance with chain.
Put shifter in lowest position and then attach cable on the FD in the slot with cable tight. Shift to middle position and use inline adjuster to set cable tension, again with minimal clearance while in the largest sprocket in back. Check that the housing that you have under the BB isn't too long to restrict the FD attachment when you try to shift to the largest chainring.
This should be about the correct cable tension. Shift to largest ring & smallest sprocket to check clearance for your highest gear ratio. Check for minimal clearance between outer cage & chain. Set high limit screw for this position, with a little additional outward movement of the cage still possible.
If this doesn't work, check that the cable housing is properly cut & prepared. Sheldon's site has some tips for preparing index cables.
07-03-23, 03:56 PM
#30
Senior Member
Thread Starter
45mm chainline is normal for a road triple, should cause you no problems.
While in the small chainring & largest sprocket, set the low limit screw to have minimal clearance with chain.
Put shifter in lowest position and then attach cable on the FD in the slot with cable tight. Shift to middle position and use inline adjuster to set cable tension, again with minimal clearance while in the largest sprocket in back. Check that the housing that you have under the BB isn't too long to restrict the FD attachment when you try to shift to the largest chainring.
This should be about the correct cable tension. Shift to largest ring & smallest sprocket to check clearance for your highest gear ratio. Check for minimal clearance between outer cage & chain. Set high limit screw for this position, with a little additional outward movement of the cage still possible.
If this doesn't work, check that the cable housing is properly cut & prepared. Sheldon's site has some tips for preparing index cables.
While in the small chainring & largest sprocket, set the low limit screw to have minimal clearance with chain.
Put shifter in lowest position and then attach cable on the FD in the slot with cable tight. Shift to middle position and use inline adjuster to set cable tension, again with minimal clearance while in the largest sprocket in back. Check that the housing that you have under the BB isn't too long to restrict the FD attachment when you try to shift to the largest chainring.
This should be about the correct cable tension. Shift to largest ring & smallest sprocket to check clearance for your highest gear ratio. Check for minimal clearance between outer cage & chain. Set high limit screw for this position, with a little additional outward movement of the cage still possible.
If this doesn't work, check that the cable housing is properly cut & prepared. Sheldon's site has some tips for preparing index cables.
__________________
"It's a fine line between absolute genius and sheer stupidity"
"It's a fine line between absolute genius and sheer stupidity"
07-03-23, 04:21 PM
#31
Senior Member
Thread Starter
45mm chainline is normal for a road triple, should cause you no problems.
While in the small chainring & largest sprocket, set the low limit screw to have minimal clearance with chain.
Put shifter in lowest position and then attach cable on the FD in the slot with cable tight. Shift to middle position and use inline adjuster to set cable tension, again with minimal clearance while in the largest sprocket in back. Check that the housing that you have under the BB isn't too long to restrict the FD attachment when you try to shift to the largest chainring.
This should be about the correct cable tension. Shift to largest ring & smallest sprocket to check clearance for your highest gear ratio. Check for minimal clearance between outer cage & chain. Set high limit screw for this position, with a little additional outward movement of the cage still possible.
If this doesn't work, check that the cable housing is properly cut & prepared. Sheldon's site has some tips for preparing index cables.
While in the small chainring & largest sprocket, set the low limit screw to have minimal clearance with chain.
Put shifter in lowest position and then attach cable on the FD in the slot with cable tight. Shift to middle position and use inline adjuster to set cable tension, again with minimal clearance while in the largest sprocket in back. Check that the housing that you have under the BB isn't too long to restrict the FD attachment when you try to shift to the largest chainring.
This should be about the correct cable tension. Shift to largest ring & smallest sprocket to check clearance for your highest gear ratio. Check for minimal clearance between outer cage & chain. Set high limit screw for this position, with a little additional outward movement of the cage still possible.
If this doesn't work, check that the cable housing is properly cut & prepared. Sheldon's site has some tips for preparing index cables.
__________________
"It's a fine line between absolute genius and sheer stupidity"
"It's a fine line between absolute genius and sheer stupidity"
07-03-23, 04:23 PM
#32
Senior Member
Will do and will check Sheldon's take on this. Somewhere in there I am losing proper tension. With only two lengths of cable, one from shifter to downtube, and the other under the bracket, hard to see where I am losing the tension. Will check for slippage at the lockdown bolt too.
You could try ditching the housing under the BB to test if tension is being loss there.
07-03-23, 05:45 PM
#33
Senior Member
Thread Starter
The housing under the BB doesn't matter since you only have a frame cable stop on one end. Just be sure that the loose end doesn't restrict the downward movement of the cable attachment mechanism. From the end of the housing you'll need about 25mm of bare cable to the cable anchor point on the FD to allow for shifting.
You could try ditching the housing under the BB to test if tension is being loss there.
You could try ditching the housing under the BB to test if tension is being loss there.
__________________
"It's a fine line between absolute genius and sheer stupidity"
"It's a fine line between absolute genius and sheer stupidity"
