Running Dura-Ace 7402 in 9-Speed?
05-21-08, 11:55 PM
#1
Senior Member
Thread Starter
Join Date: Oct 2006
Location: Illinois
Posts: 539
Bikes: No bike at the moment; In process of building it.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Running Dura-Ace 7402 in 9-Speed?
An old triathalete I know told me he used to run his DA 7402 RD with 9-Speed bar-ends (7700/7400 I'm guessing) and a 9-speed DA cassette with no problems at all. Consequently, the 9-speed DA bar-end shifters are also the bar-end shifters to use in 8-speed for DA 7402.
I just acquired some DA 7402 RD stuff and I have and old 9-speed DA casette so I might as well as gain a gear (2 actually) and save some money by not buying an 8-speed casette and use both.
Has anyone tried this?
I just acquired some DA 7402 RD stuff and I have and old 9-speed DA casette so I might as well as gain a gear (2 actually) and save some money by not buying an 8-speed casette and use both.
Has anyone tried this?
05-22-08, 12:58 AM
#2
Senior Member
Join Date: Oct 2006
Posts: 443
Bikes: 86' Davidson Impulse, 83' Windsor Professional
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I haven't tried it myself with that specific RD, but I'm sure it will work just fine. Most of the time you can get away with it unless the RD has a abnormally small range. Some older model RD pulleys might have extra play in the upper pulley compared to, say 10spd RD's since 10spd uses narrower gear spacing. I say it will work flawlessly.
05-22-08, 06:47 AM
#3
Cat 6
Join Date: Dec 2007
Location: Mountain Brook, AL
Posts: 7,482
Mentioned: 27 Post(s)
Tagged: 0 Thread(s)
Quoted: 500 Post(s)
Liked 183 Times
in
118 Posts
The 9s bar-ends are supposed to shift the old 74xx RD in 8s mode (4.8mm cog spacing). It's not designed to shift in that RD in 9s (4.34mm) cog spacing. Are you sure your friend was running a 9s cassette w/9s spacers in there? I'm thinking his memory is hazy.
__________________
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
72 Frejus (for sale), Holdsworth Record (for sale), special CNC & Gitane Interclub / 74 Italvega NR (for sale) / c80 French / 82 Raleigh Intl MkII f&f (for sale)/ 83 Trek 620 (for sale)/ 84 Bruce Gordon Chinook (for sale)/ 85 Ron Cooper / 87 Centurion IM MV (for sale) / 03 Casati Dardo / 08 BF IRO / 09 Dogma FPX / 09 Giant TCX0 / 10 Vassago Fisticuff
Last edited by Ex Pres; 05-22-08 at 06:50 AM.
05-22-08, 11:30 AM
#4
cycles per second
Join Date: Oct 2003
Location: Minnesota
Posts: 1,930
Bikes: Early 1980's Ishiwata 022 steel sport/touring, 1986 Vitus 979, 1988 DiamondBack Apex, 1997 Softride PowerWing 700, 2001 Trek OCLV 110
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 44 Post(s)
Liked 71 Times
in
48 Posts
The RD-74xx will move too far per shift to work well for 9-speed. You may be able to get it to work OK on 3 or so of the middle cogs and the high/low derailer stops will make it work OK for the first and last cog, but the other cogs may not work so well. I tried on my bike but I was not satisfied with the result so I picked up a used RD-7700 on eBay.
05-22-08, 11:36 AM
#5
Senior Member
Join Date: Jul 2002
Location: Sacramento, California, USA
Posts: 40,865
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2952 Post(s)
Liked 3,106 Times
in
1,417 Posts
I believe that if you switch the bar end shifters to friction mode, you can use them on any number of cogs in the rear.
05-22-08, 04:00 PM
#6
Senior Member
Join Date: Oct 2006
Posts: 443
Bikes: 86' Davidson Impulse, 83' Windsor Professional
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Ah , I forgot 7400 is the weird group. Search around on Sheldons site, he has a diagram of an alternative cable routing for 7400 era DA RD. Just by affixing the cable in a slightly different fashion, you can adjust the pull ratio of the RD and get it to act just like "regular" ratio RD's. Simple, effective, costless.
-edit-
Maybe not. Heres sheldons page explaining it all: Shimano Dura-Ace Compatibility
-Jerry
-edit-
Maybe not. Heres sheldons page explaining it all: Shimano Dura-Ace Compatibility
-Jerry
Last edited by jerrymcdougal; 05-22-08 at 04:03 PM.
05-24-08, 05:42 PM
#7
Senior Member
Thread Starter
Join Date: Oct 2006
Location: Illinois
Posts: 539
Bikes: No bike at the moment; In process of building it.
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Oh bloody hell!
Will it be that bad to have 8-speeds instead of 9? Yes, yes it will. For I love the number 9, especially over it's younger sibling 8 (because the weakling was eaten by that jerk 7).
Will it be that bad to have 8-speeds instead of 9? Yes, yes it will. For I love the number 9, especially over it's younger sibling 8 (because the weakling was eaten by that jerk 7).
