Front Derailleur Question
#1
Enjoying the Ride
Thread Starter
Join Date: Jun 2007
Location: Woostah, MA
Posts: 116
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Front Derailleur Question
Is there an inherent difference in where a FD will fall laterally with respect to the chainrings when you compare a clamp on FD and a braze on FD with clamp adapter?
I have a braze on 9 spd FD w/ clamp adapter (older Shimano 600) and a Ultegra double 10 speed crank. The crank, chainrings + chain are the only 10spd components, everything else is 9 spd. It works fine, except I really need the FD to move inward towards the bike another 1/8" or so to get it centered properly and noiseless. I've adjusted the limit screw to allow it to come in as close as possible. At this point, it's just the geometry of the 4 bar parallel linkage preventing it from moving closer.
Will a clamp on 9 spd derailleur have any effect? (get rid of braze on + clamp adapter)
Does the 9spd vs 10 spd make any difference? I wouldn't think so, but maybe I'm missing something...
thanks a ton!
bob
I have a braze on 9 spd FD w/ clamp adapter (older Shimano 600) and a Ultegra double 10 speed crank. The crank, chainrings + chain are the only 10spd components, everything else is 9 spd. It works fine, except I really need the FD to move inward towards the bike another 1/8" or so to get it centered properly and noiseless. I've adjusted the limit screw to allow it to come in as close as possible. At this point, it's just the geometry of the 4 bar parallel linkage preventing it from moving closer.
Will a clamp on 9 spd derailleur have any effect? (get rid of braze on + clamp adapter)
Does the 9spd vs 10 spd make any difference? I wouldn't think so, but maybe I'm missing something...
thanks a ton!
bob
#2
Elitist Troglodyte
Join Date: Jun 2006
Location: Dallas
Posts: 6,925
Bikes: 03 Raleigh Professional (steel)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
No.
Do you have any idea whether the front chainline is correct?
Do you have any idea whether the front chainline is correct?
__________________
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
#3
Enjoying the Ride
Thread Starter
Join Date: Jun 2007
Location: Woostah, MA
Posts: 116
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#4
Boomer
Join Date: Nov 2003
Posts: 7,214
Bikes: Diamondback Clarity II frame homebuilt.
Mentioned: 106 Post(s)
Tagged: 0 Thread(s)
Quoted: 16098 Post(s)
Liked 1,457 Times
in
1,064 Posts
If the derailleur is moving in as far as possible, usually defined by striking the frame, and is still not doing the job, then it would seem that the only thing that fix the problem is a longer bottom bracket axle.
#5
A little North of Hell
Join Date: Mar 2006
Posts: 4,892
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 71 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
chainline
He is running a Ultegra 10spd crankset, the chainline is not subject to change. 43.5mm
https://techdocs.shimano.com/media/te...9830616000.pdf
https://techdocs.shimano.com/media/te...9830616000.pdf
#6
Senior Member
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,656
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 2026 Post(s)
Likes: 0
Liked 1,096 Times
in
742 Posts
I'm not sure if it applies to 9 or 10-speed fd's but for Shimano 8-speed components, the clamp-on fd sat slighty further "forward" than the braze-on + adapter. I had to use an 8-speed triple clamp-on on my '96 Litespeed so the dearilleurs actuating arm would clear the rear tire in the big chain ring. The braze-on + adapter set-up rubbed the tire.
The 9 and 10-speed fd's have been redesigned with a shorter actuating arm so this problem no longer exists.
The 9 and 10-speed fd's have been redesigned with a shorter actuating arm so this problem no longer exists.
#7
(Grouchy)
Join Date: Mar 2003
Posts: 3,643
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
if the FD is hitting the frame, try rotating it on the seat tube until it clears the chain. the FD cage should be parallel with the chainrings, but a lot of times, contact between the FD and the seat tube prevents the cage from clearing the chain. a tiny amount (a few degrees) of rotation will fix this and is acceptable.
#8
Elitist Troglodyte
Join Date: Jun 2006
Location: Dallas
Posts: 6,925
Bikes: 03 Raleigh Professional (steel)
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
When you have problems like this, you check everything. After all, it's a simple enough measurement.
__________________
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
Stupidity got us into this mess - why can't it get us out?
- Will Rogers
#9
Enjoying the Ride
Thread Starter
Join Date: Jun 2007
Location: Woostah, MA
Posts: 116
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Thanks everyone for the very thoughtful replies.
I finally was able to spare some time last night to measure the front chainline. Sure enough, it's right on the money. I measured 43.42mm. Not bad considering Shimano's target of 43.50mm.
The FD does not hit the frame. It simply does not have sufficient travel in the 4-bar linkage to move inward enough.
I'm not sure what else to check? Maybe I should swing by the LBS and try on a new clamp-on FD to check sizing? I'm sure I can score a clamp on 9 spd Ultegra FD cheap enough, but I'd like to know that I've exhausted all other possiblities before spending more $$$...
Thanks again-
Bob
I finally was able to spare some time last night to measure the front chainline. Sure enough, it's right on the money. I measured 43.42mm. Not bad considering Shimano's target of 43.50mm.
The FD does not hit the frame. It simply does not have sufficient travel in the 4-bar linkage to move inward enough.
I'm not sure what else to check? Maybe I should swing by the LBS and try on a new clamp-on FD to check sizing? I'm sure I can score a clamp on 9 spd Ultegra FD cheap enough, but I'd like to know that I've exhausted all other possiblities before spending more $$$...
Thanks again-
Bob