Ultegra Triple FD compatibility w LX Triple crank?
06-12-08, 07:42 PM
#1
Junior Member
Thread Starter
Join Date: Jan 2008
Posts: 18
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Ultegra Triple FD compatibility w LX Triple crank?
Currently swapping out my shimano 105 double crank (53-39)for a triple on my Surly Crosscheck. Will the ultegra triple FD dial in with the LX triple (48-36-26) crank I have? Or should I purchase a LX or XT FD to
increase compatibility. Thank you in advance.
sean
increase compatibility. Thank you in advance.
sean
06-12-08, 07:55 PM
#2
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
I have used a 105 triple on a 26/36/48 crankset without problem. The Ultegra FD appears to have a very similar (if not identical) cage shape.
I have also used the specific LX front derailleur that was designed to go with that crank and............am presently using the combo with a SRAM X.7 Front Derailleur (that is spec'd for a 48 tooth max ring).
All seemed to work well.
I have also used the specific LX front derailleur that was designed to go with that crank and............am presently using the combo with a SRAM X.7 Front Derailleur (that is spec'd for a 48 tooth max ring).
All seemed to work well.
__________________
06-12-08, 07:58 PM
#3
greasy
Join Date: May 2008
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
ultegra triple FD has a range of 22t. the difference between your big ring and small.
48t-26t=22t. this is the listed maximum range. should work, just slide the deraileure down.
48t-26t=22t. this is the listed maximum range. should work, just slide the deraileure down.
06-12-08, 08:08 PM
#4
greasy
Join Date: May 2008
Posts: 14
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
06-13-08, 02:39 PM
#5
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
You don't give us part numbers so it's hard to know, but the two cranks may not use the same BB. The 9-speed road cranks (6500) use Octalink v.1 and the Deore LX M751/751 use Octalink V.2. The two look alike but are not interchangeable.
https://sheldonbrown.com/bbsize.html#shimano
You can't swap the BBs either because the hanger tubes are different lengths.
https://sheldonbrown.com/bbsize.html#shimano
You can't swap the BBs either because the hanger tubes are different lengths.
__________________
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
Last edited by DMF; 06-13-08 at 02:49 PM.
06-13-08, 02:53 PM
#6
Senior Member
EDIT: I should point out that my experience is with the LX M581 48-36-26 crankset, which has external bearing cups (Hollowtech?), not Octalink.
