Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Dura Ace 740X 8 Speed compatibility

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Dura Ace 740X 8 Speed compatibility

Old 07-13-19, 01:09 PM
  #1  
Freddyonabike
Senior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 80
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Liked 0 Times in 0 Posts
Dura Ace 740X Hub 8 Speed compatibility

Hello!

I have a Koga Miyata with Dura Ace hub, which I believe is the 7403 version that is uniglide & hyperglide compatible. Atleast to my knowledge.
Does anyone know if its possible to mount a 9 speed on it?
Does it matter which Shimano cassette I choose as long as its a CS-HG?

Thank You!

Last edited by Freddyonabike; 07-13-19 at 01:14 PM.
Freddyonabike is offline  
Old 07-13-19, 02:02 PM
  #2  
Dave Mayer
Senior Member
 
Join Date: Dec 2006
Posts: 1,868
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 659 Post(s)
Likes: 0
Liked 34 Times in 22 Posts
Originally Posted by Freddyonabike View Post
Hello!

I have a Koga Miyata with Dura Ace hub, which I believe is the 7403..
Does it matter which Shimano cassette I choose as long as its a CS-HG?
Rare hub. The 7403 will accept a 8, 9 or 10 speed Shimano or SRAM cassette, as long as the cassette doesn't start with an 11-tooth cog.

If you have the rarer Uniglide-only 7402 hub, then good luck at finding anything to fit. Which is the reason why these (orphaned and useless) hubs have cluttered up Ebay for years.
Dave Mayer is offline  
Likes For Dave Mayer:
Old 07-13-19, 02:09 PM
  #3  
Freddyonabike
Senior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 80
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Liked 0 Times in 0 Posts
I'm 100% sure its a 7403 hub, because it has threads to install a cassette!
I cant even find 8 speed that doesnt start with a 11-tooth cog...
Freddyonabike is offline  
Old 07-13-19, 02:26 PM
  #4  
rccardr 
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Posts: 5,541

Bikes: Lots. Just...lots.

Mentioned: 162 Post(s)
Tagged: 0 Thread(s)
Quoted: 1104 Post(s)
Liked 83 Times in 61 Posts
One of the best hubs Shimano ever made, IMO.

Lots of 8 speed cassettes out there that start with a 13 (e.g. 13-26). But you originally inquired about 9 speed cassettes, common ones are 12-25 and 12-27.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline  
Old 07-13-19, 02:32 PM
  #5  
veganbikes
Clark W. Griswold
 
Join Date: Mar 2014
Location: ,location, location
Posts: 5,214

Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Pink Klein MTB, Phil Wood VeloXS Frame (w/DA 7400), Cilo Road Frame, Proteus frame

Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1190 Post(s)
Liked 50 Times in 35 Posts
I did replace a uniglide freehub on a 600 tricolor hub. I believe it was an LX freehub and it worked well. It was an ex-coworkers hub and he is riding it today. If you want 11-xx you might look for an older 90s era Shimano freehub body somewhere and try that out. If not try a 12-xx which is just fine.
veganbikes is offline  
Old 07-13-19, 02:47 PM
  #6  
Freddyonabike
Senior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 80
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by rccardr View Post
One of the best hubs Shimano ever made, IMO.

Lots of 8 speed cassettes out there that start with a 13 (e.g. 13-26). But you originally inquired about 9 speed cassettes, common ones are 12-25 and 12-27.
Oh ye I misread! Thanks alot for help guys!

Does it matter which Shimano or Sram series it is? Basicly, is it worth getting a expensive cassette?

Last edited by Freddyonabike; 07-13-19 at 02:54 PM.
Freddyonabike is offline  
Old 07-13-19, 05:05 PM
  #7  
Dave Mayer
Senior Member
 
Join Date: Dec 2006
Posts: 1,868
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 659 Post(s)
Likes: 0
Liked 34 Times in 22 Posts
Originally Posted by veganbikes View Post
I did replace a uniglide freehub on a 600 tricolor hub. I believe it was an LX freehub and it worked well. It was an ex-coworkers hub and he is riding it today. If you want 11-xx you might look for an older 90s era Shimano freehub body somewhere and try that out. If not try a 12-xx which is just fine.
Nope. Only Shimano 740X series freehubs fit on these hubs. Completely incompatible design. You also need a special tool to remove these special freehubs, unless your plan is destructive removal involving a bench vise.

The tool is near impossible to find. As are replacement 7403 Hyperglide freehub bodies.
Dave Mayer is offline  
Old 07-13-19, 10:52 PM
  #8  
veganbikes
Clark W. Griswold
 
Join Date: Mar 2014
Location: ,location, location
Posts: 5,214

Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Pink Klein MTB, Phil Wood VeloXS Frame (w/DA 7400), Cilo Road Frame, Proteus frame

Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 1190 Post(s)
Liked 50 Times in 35 Posts
Originally Posted by Dave Mayer View Post
Nope. Only Shimano 740X series freehubs fit on these hubs. Completely incompatible design. You also need a special tool to remove these special freehubs, unless your plan is destructive removal involving a bench vise.

The tool is near impossible to find. As are replacement 7403 Hyperglide freehub bodies.
I should have figured. The 7400 stuff has always been listed as compatibility challenged with other stuff. Kinda sad as it is probably one of the best performing gruppos ever. 600 Tricolor is best for looks and the 6800 stuff is my favorite modern wise.
veganbikes is offline  
Old 07-14-19, 01:14 AM
  #9  
Freddyonabike
Senior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 80
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Liked 0 Times in 0 Posts
Originally Posted by Dave Mayer View Post
Nope. Only Shimano 740X series freehubs fit on these hubs. Completely incompatible design. You also need a special tool to remove these special freehubs, unless your plan is destructive removal involving a bench vise.

The tool is near impossible to find. As are replacement 7403 Hyperglide freehub bodies.
Is it possible to maintain the hub then, if you cant get it off without a special tool or breaking it?
Freddyonabike is offline  
Old 07-14-19, 05:51 AM
  #10  
rccardr 
aka: Dr. Cannondale
 
rccardr's Avatar
 
Join Date: Jul 2009
Posts: 5,541

Bikes: Lots. Just...lots.

Mentioned: 162 Post(s)
Tagged: 0 Thread(s)
Quoted: 1104 Post(s)
Liked 83 Times in 61 Posts
Yes, you can maintain the hub bearings just as with any other Shimano freehub setup. Just don't expect to remove the freehub itself.
Thankfully, they seem to last pretty much forever. I have that hubset on a half dozen bikes and they operate just fine.
__________________
Hard at work in the Secret Underground Laboratory...
rccardr is offline  
Old 07-14-19, 11:34 AM
  #11  
Dave Mayer
Senior Member
 
Join Date: Dec 2006
Posts: 1,868
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 659 Post(s)
Likes: 0
Liked 34 Times in 22 Posts
Dura-Ace 740X hubs are about the easiest to service of any I've come across. You rotate the little plastic covers until the mark indicates: OPEN. Then you take your grease injector and squirt until some of the old contaminated grease oozes out. Over the next couple of rides you'll have to clean up some excess. 60-second overhaul. Done.

The freehub is another matter. Fortunately, Shimano cassette hub freehubs are very well sealed: best in the business. Just don't do anything stupid like wash your bike with a hose, or submerge your bike, or drive in the rain with your bike on a rack.
Dave Mayer is offline  
Old 07-14-19, 01:26 PM
  #12  
Freddyonabike
Senior Member
Thread Starter
 
Join Date: Jun 2018
Posts: 80
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Liked 0 Times in 0 Posts
I've been riding the bike in heavy rain, and the freehub sounds kinda dry, which is why I'd love to clean it and re-lube.
Freddyonabike is offline  
Old 07-14-19, 07:26 PM
  #13  
speedevil 
I never finish anyth
 
speedevil's Avatar
 
Join Date: Jul 2010
Location: Western KY
Posts: 1,080

Bikes: 2008 Merckx LXM, 2003 Giant XTC mtb, 2001 Lemond Alpe d'Huez, 1997 Lemond Zurich, 1989 Cannondale ST, 1988 Masi Nuovo Strada, 1983 Pinarello Turismo

Mentioned: 58 Post(s)
Tagged: 0 Thread(s)
Quoted: 265 Post(s)
Liked 76 Times in 52 Posts
I just swapped a 7401 UG freehub for a 7403 UG/HG freehub. The special tool is the only way it's coming off short of destructive removal. But don't do that, please. 7403 freehubs are basically unobtainium. They work for 8-9-10 speed cassettes.

After I removed the 7403, I cleaned it out with solvent, and then let it sit in a bath of mobil 1 synthetic gear oil for a couple of days. I let it drain for a couple of days afterwards. Installed it and it works perfectly. it's almost silent when freewheeling, and engages quickly. On the maiden voyage, I had some grease work it's way out of the hubs (both front and rear), and I just wiped it clean and checked the preload. All good.

In my admittedly limited experience with DA hubs, these are smooth and well worth the effort to maintain them.
__________________
Dale, NL4T
speedevil is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dparham
Classic & Vintage
21
05-21-17 06:41 PM
Tandem Tom
Classic & Vintage
17
01-11-15 08:58 PM
squatchy
Classic & Vintage
13
01-14-14 11:30 AM
Rnfstr
Road Cycling
4
07-29-11 06:33 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.