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Dura Ace freehub ID 7400 7402 7403 101

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Dura Ace freehub ID 7400 7402 7403 101

Old 03-04-10, 05:39 PM
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miamijim
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Dura Ace freehub ID 7400 7402 7403 101

This is brought up fairly frequently so I thought I'd throw something together. Shimano offered 3 different version of the 740X series freehubs, 7400, 7402 and 7403. There is NO 7401 hub. First lets clarify some terminolgy in 'Jim Speak' which is valid for the purposes of this thread only.

Freehub: Ratcheting mechanism is built into hub.
Cassette: Group of sprockets that slide onto freehub
Uni-glide cassette: group of sprockets with 1 threaded sprocket that holds it all on
Hyperglide cassette: group of sprockets that uses an inner lockring to hold it all on. All Hyperglide hubs have FULL LENGTH splines. Important!!!
Locknut: nut that holds axle parts tightly together
126mm: flat lock nut
130mm: mushroom locknut
6-speed: flat locknut
7-speed: flat locknut
8-speed: mushroom locknut

FH-7400: Uniglide only. 126mm spacing only. Available in both 6 or 7 speed versions. The freehub itself is identicle with the only difference being a difference in cassette spacing and number of cogs. Shimano labled these as FH-7400-6/7. From what I've been able to tell you could order a FH-7400-6 hubset that came with a 6-speed cassette or a FH-7400-7 that came with a 7-speed cassette.

FH-7402: Uniglide only. 130mm spacing. A very similar hub to the FH-7400, its just a little wider to fit 8-speeds

FH-7403: Both Uniglide and Hyperglide. 130mm spacing. Although this hub is Uni-Glide I dont believe its 1st and 2nd cog interchange with the 7400 or 7402 hubs due to difference in threaded area diameters.

So...here we go. First up is the FH-7400. Visual cues are the flat locknut which means 6/7 speed and the external threading which is a Uni-Glide feature. Notice that the splines are NOT full length. This NOT a Hyperglide hub!!!


Next up we have the FH-7402. Visual cues are the mushroom locknut which means 8-speed and the external threading which in a Uni-Glide feature. Notice that the splines are NOT full length. This is NOT a HyperGlide hub!!!



Last in the lineup is the versatle FH-7403. Visual cues are the mushroom locknut which means 8-speed and the full length splines which is a HyperGlide feature. External threading is a UniGlide feature. The FH-7403 is both a UniGlide and HyperGlide hub.







Peace....

Last edited by miamijim; 07-07-17 at 01:38 PM.
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Old 03-04-10, 08:36 PM
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Were you anticipating my question?
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Old 03-04-10, 09:00 PM
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Nice summary Jim.
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Old 03-04-10, 10:07 PM
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Originally Posted by Ex Pres View Post
Next you're going to tell us where we can buy 7403 freehub bodies, right???
Yep. You can find them attached to 7403 hubs.
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Old 03-05-10, 12:11 AM
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Originally Posted by miamijim View Post
Last in the lineup is the versatle FH-7403. Visual cues are the mushroom locknut which means 8-speed and the full length splines which is a HyperGlide feature. External threading is a UniGlide feature. The FH-7403 is both a UniGlide and HyperGlide hub.
Jim: the purpose of the conical "mushroom" locknut is to make it easier to cram the 130mm OLD hub into a 126mm width frame without previous cold-setting.
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Old 03-05-10, 12:42 AM
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This is exactly what I needed. While it isn't particularly complicated to tell the differences between them, there is a lot of confusion concerning these hubs.

This confusion is particularly frustrating when a guy is trying to get some 740- hubs, especially some that will work with modern cassettes. Thanks for spelling it out.
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Old 05-24-10, 06:06 PM
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Interchangeability

So this looks a good place to ask a rather specific question:

I have an FH-7403 which has a split freehub body and a cracked bearing cup on the inside. I have a load of other shimano freehub bodies lying around at home, in particular a nice titanium 7700 body. If all I want to do is slide the body shell off (pending arrival of special tool tl-fh10) and replace the cracked cup, would this work? Or put another way - is it only the fixing bolt which is different between pre and post 1997 Dura Ace i.e. could I just put the FH-7403 splined fixing bolt into the FH-7700 titanium and put that onto the hub - or is that just too simplistic? I mean why are all these people searching for 7400 freehub bodies if the answer was that simple right? So I'm anticipating the answer to be that it is more complex. All that apart - worst case scenario - can I replace the freehub body shell and the bearing cup with the same components from another generic shimano freehub? Any help much appreciated. Thanks
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Old 05-24-10, 07:02 PM
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For those of us in the low-rent districts, Shimano HG-50 hubs also provide the Uniglide/Hyperglide cross-compatibility.
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Old 05-25-10, 06:23 PM
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Originally Posted by thirtyoneten73 View Post
So this looks a good place to ask a rather specific question:

I have an FH-7403 which has a split freehub body and a cracked bearing cup on the inside. I have a load of other shimano freehub bodies lying around at home, in particular a nice titanium 7700 body. If all I want to do is slide the body shell off (pending arrival of special tool tl-fh10) and replace the cracked cup, would this work? Or put another way - is it only the fixing bolt which is different between pre and post 1997 Dura Ace i.e. could I just put the FH-7403 splined fixing bolt into the FH-7700 titanium and put that onto the hub - or is that just too simplistic? I mean why are all these people searching for 7400 freehub bodies if the answer was that simple right? So I'm anticipating the answer to be that it is more complex. All that apart - worst case scenario - can I replace the freehub body shell and the bearing cup with the same components from another generic shimano freehub? Any help much appreciated. Thanks
I cant speak for the 77XX series but only 74XX freehub bodeis interchange with 74XX freehub bodies.


Originally Posted by top506 View Post
For those of us in the low-rent districts, Shimano HG-50 hubs also provide the Uniglide/Hyperglide cross-compatibility.
Top
With the excpetion of Dura ace thats what nice about eveything in Shimanos lineup. All of the old freehub bodeis interchange with with each other, there are some minor issues but its nothing that'll deraill a project.
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Old 05-19-11, 11:02 AM
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Originally Posted by thirtyoneten73 View Post
So this looks a good place to ask a rather specific question:

I have an FH-7403 which has a split freehub body and a cracked bearing cup on the inside. I have a load of other shimano freehub bodies lying around at home, in particular a nice titanium 7700 body. If all I want to do is slide the body shell off (pending arrival of special tool tl-fh10) and replace the cracked cup, would this work? Or put another way - is it only the fixing bolt which is different between pre and post 1997 Dura Ace i.e. could I just put the FH-7403 splined fixing bolt into the FH-7700 titanium and put that onto the hub - or is that just too simplistic? I mean why are all these people searching for 7400 freehub bodies if the answer was that simple right? So I'm anticipating the answer to be that it is more complex. All that apart - worst case scenario - can I replace the freehub body shell and the bearing cup with the same components from another generic shimano freehub? Any help much appreciated. Thanks
I'm kind of in the same boat wondering if I could swap bearing cup from another freehub. Looking at my only spare (a 105 7-speed) the bearing cup in the dura ace 7400 has a wider hole for the threads and won't be swapped. I don't see anything preventing a shell swap, but I haven't looked at the internals of a newer freehub shell.

Last edited by coweater; 05-20-11 at 12:49 AM. Reason: said cone instead of cup
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Old 05-19-11, 11:54 AM
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Originally Posted by coweater View Post
I'm kind of in the same boat wondering if I could swap bearing cones from another freehub. Looking at my only spare (a 105 7-speed) the bearing cup in the dura ace 7400 has a wider hole for the threads and won't be swapped. I don't see anything preventing a shell swap, but I haven't looked at the internals of a newer freehub shell.
Shell swaps will NOT work. I'm not sure about races, I'll look into it. Axle cones may swap out but you'll need to use the dust shield from the hub the donor cone came from.
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Old 05-20-11, 01:49 AM
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Sorry, when I said cone I meant the cup or race. I edited to fix.

I went ahead and tried the cup swap from my 7 speed early hyperglide. The threads do match, but the dura ace part was deeper so now the inside cone doesn't contact the bearings and you end up with a lot of play in the shell. If I had a real neat tap I could make the threads deeper and get it on far enough, but I'm pretty sure I'm at a dead end.

This doesn't rule out newer 8/9 speed freehubs (in fact the wider bodies may account for the difference), but I don't have one I'm willing to disassemble right now.
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Old 05-20-11, 03:15 AM
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Insightful thread Jim, thanks.
Hmm, looks like I'm SOL with my 7402. :-\
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Old 02-07-12, 10:44 AM
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Hi all,

I was in the process of changing cassette to my 8-speed Dura Ace bike (worn sprockets), I really thought it was Hyperglide, but now see that FH-7402 was still Uniglide

I bought this new 8-speed HG cassette, and I would like to make it all work together. I think the best way would be to change the freehub body with a HG one, but which 8-speed, HG bodies can I buy new that could be mounted on 7402 hub? On eBay I see a few options, but I really want it to be compatible and I found out I still ha ve A LOT to learn.

Could anyone give me some advice?
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Old 02-07-12, 12:59 PM
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Buy an 8spd cassette and file off the long tab on the inside of the gear to make a HG gear fit on a UG hub. The only part you keep from the UG cassette is the smallest gear because it is threaded to hold on the other gears. When you have a DA hub you have to do what ever you can to keed it usable because they are so nice. I have a 7403 and find it cool that it will use a 6spd or a 10spd. Edit. go to Sheldon Brown he has all the info on going HG to UG.
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Old 02-07-12, 02:16 PM
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Ahh, I'm very familiar with this thread. It all began with a DA-7402/Mavic Reflex wheelset that I bought for $25 with a missing rear axel and cracked freehub body bearing race. Long story short, bought a new axel, found a donor hub with a good HG freehub body, swapped some parts, Life is good.
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Old 10-06-12, 02:42 PM
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Will an Shimano HG-50 7-speed Cassette fit on a 7 speed Dura Ace Uniglide hub?
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Old 12-07-12, 01:15 PM
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I would like to know a little more about what you did Standard Issue to recover your fh-7402. It is not clear if you updated the hub to HG or if it remained DA UG when you were done.

If you updated the hub to HG (which would be awesome news), what parts did you swap. I noticed that miamijim says that shell swaps will not work to make it HG so maybe you just swapped out the free hub cup and the hub remained DA UG. Inquiring minds would like to know...

Thanks
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Old 12-09-12, 12:15 PM
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So will a standard new 8-speed cassette install fine on a 7403 uni/hyperglide hub?
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Old 09-25-13, 12:26 PM
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very helpful. I just picked up an FH-7403.
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Old 09-25-13, 12:39 PM
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Originally Posted by southpawboston View Post
So will a standard new 8-speed cassette install fine on a 7403 uni/hyperglide hub?
It should....
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Old 09-25-13, 01:17 PM
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I'll tell you tonight
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Old 09-25-13, 04:53 PM
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yup. SRAM PC850 11-28 (I was told the 11T wouldn't work, but it does)
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Old 07-07-14, 04:42 AM
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Whats the easiest way to transform 7 speed ultraglide hub (fh-7400) into 8 speed (fh-7402)?
(I d like to fit sti st-7400 dura ace shifters - I know I could go with campy ergo 8 + campy rear derailleur)
New cassette and chain but do I need new hub also or can I transform fh-7400 to fh-7402

Is axle length the same (one being 126mm and other 130mm) so I can only put mushroom spacer?
Or could I buy only hub axle with spacers (found it on ebay)?
What about freehub? (is it the same)
Is hub body the same?

The thing is I dont want to buy new hub and then respoke entire rear wheel if I dont have to.
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Old 07-07-14, 09:46 AM
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@jimmuller - timing was really good! I will double check the Pin to determine 7402/3. I think it is the latter.
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