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Shimano 105 1050 hub VS Dura Ace 7400 FW

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Shimano 105 1050 hub VS Dura Ace 7400 FW

Old 02-14-20, 12:19 PM
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Shimano 105 1050 hub VS Dura Ace 7400 FW

I have a NOS Shimano 105 1050 hubset and NOS Dura Ace 7400 freewheel. I tried test fitting the fw but it only threads in 1/4 of the way onto the hub. Am i missing something? I figured both must be English threaded. The Suntour fw I have smoothly threads in but not the Shimano.

Any help is appreciated.





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Old 02-14-20, 12:24 PM
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Would think both are English threaded unless otherwise noted. Are you sure threads are clean on the Dura Ace? Try some grease on threads, which is needed anyhow as you have Aluminum against Steel.

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Old 02-14-20, 12:57 PM
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Maybe you could try threading on a (BSA) bottom bracket lockring to confirm?
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Old 02-14-20, 01:08 PM
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It could be a slight burr on one of the threads. I would apply a light coating of grease on all the hub threads then gently thread the Dura Ace freewheel on by hand using the correct splined removal tool by hand to work it back and forth.

If the 7400 freewheel body has been exposed to any corrosion (which is entirely possible), I would take a clean shop cloth with some WD-40 on it and just work it back & forth on the freewheel body threads in order to remove some light corrosion or thickened old grease. Then re-try.
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Old 02-14-20, 05:45 PM
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Thanks everyone so far with replies.

On the DA FW I noticed a small section of a thread wasn't clean cut. Worst I can think is that it was installed, cross threaded and stored away. Luckily my LBS said they can repair it.
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Old 03-09-20, 07:55 PM
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Is it possible for both threads not be compatible yet because theyre both NOS?

I tried the FW on a different hub and it threaded smoothly.
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Old 03-10-20, 06:33 AM
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New parts should go together like new parts.
Sounds like you've got old grease or wonky threads on one or the other, or both.
Mix n match with other parts to figure out where the problem is, or it sounds like your LBS can help you diagnose.
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Old 03-10-20, 10:25 AM
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Is it possible that those new 105 hubs are...dare I say it...French threaded? Or some other non compatible threading?
English and Italian work fine together (aside from the old once installed use only English on Italian) but not sure about mixing other types.

Also possible that the threading is just wrong? An old English threaded BB cut out of a frame would make a pretty good trial die...
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Old 03-10-20, 11:04 AM
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But just to recap, another freewheel (presumably English threaded) threads onto this hub, right? And this freewheel threads onto another (presumably English threaded) hub, right?
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Old 03-10-20, 11:15 AM
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I have a 6 speed Suntour Maeda FW that threads into the hub with no issues.

The Dura Ace FW threads into a high flange bmx hub which I'm assuming is English threaded. No issues there.

Ive yet to try the lockring test ThermionicScott suggested.
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Old 03-10-20, 11:20 AM
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rccardr Those are some foul words to be throwing around!!! French!!!...to the corner young man.


But Yes the dreadful French threaded theory may be correct. If it turns out to be true ill have to sell and purchase for another hubset. Id love to use the Dura Ace freewheel.
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Old 03-10-20, 12:00 PM
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So to complete the "mix and match" idea as suggested by Hudson308 , try threading the Suntour freewheel onto the BMX hub. If that also jams, then that suggests that both 105 hub and the Suntour FW are French thread, so one option would be to sell them as a kit.
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Old 03-10-20, 02:20 PM
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Suntour FW, Dura Ace FW and BSA lockring goes into bmx hub with no issues.

Dura Ace FW doesn't go into 105 hub.
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Old 03-10-20, 10:01 PM
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Originally Posted by malcala622 View Post
Suntour FW, Dura Ace FW and BSA lockring goes into bmx hub with no issues.

Dura Ace FW doesn't go into 105 hub.
I like your "NOS" theory. I bet the threads of the hub need to be worn in a smidgen. I also bet the threads on the SunTour freewheel were machined to a slightly looser tolerance than the Dura-Ace freewheel.

In my years working in the bike business I never saw a French-threaded Dura-Ace freewheel or French-threaded 105 hubs. They might have been made but I would lay long odds against it. Both were made after the time the French started adopting English threading for many of their components.

If these were my parts I would not hesitate to build hub into a wheel and then thread the freewheel on. If it stops, double check that it's going on straight then crank on it with a chain whip.
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Old 03-10-20, 10:10 PM
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Originally Posted by malcala622 View Post
I have a NOS Shimano 105 1050 hubset and NOS Dura Ace 7400 freewheel. I tried test fitting the fw but it only threads in 1/4 of the way onto the hub. Am i missing something? I figured both must be English threaded. The Suntour fw I have smoothly threads in but not the Shimano.

Any help is appreciated.





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As far as I know, the Dura Ace 7400 freewheel is just for Dura Ace 7400 hub set. For hub set of 105 1050 series only can go with Shimano freewheel of any series of 105, including even 600 of 6200, 6400 series. But not Dura Ace. Only freewheel of Dura Ace is matched to Dura Ace hub. That's a norms for Shimano.
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Old 03-11-20, 07:01 AM
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Originally Posted by Nguyen Dang View Post
As far as I know, the Dura Ace 7400 freewheel is just for Dura Ace 7400 hub set. For hub set of 105 1050 series only can go with Shimano freewheel of any series of 105, including even 600 of 6200, 6400 series. But not Dura Ace. Only freewheel of Dura Ace is matched to Dura Ace hub. That's a norms for Shimano.
Not true. All Shimano hubs, including Dura Ace, use the same freewheel threading patterns and sizes.

Additionally, there wer no 6400 freewheels as this was the first Shimano group to be sold exclusively with freehubs.

You may be confusing this with a series of Dura Ace 7400/7401 freehubs, which had a reduced size threaded end to accept smaller first cogs.
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Old 03-11-20, 07:03 AM
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Shimano's New 105 was only manufactured for the 1987-1989 model years. The thread standard is not mentioned in the literature. Nor is the thread standard mentioned for the New Dura-Ace freewheel. These are good indicators that they were offered only in the English thread standard. This is substantiated by the fact that Shimano lists threading options available on other components , such as the English, French and Italian threading options for the both New 105 and New Dura-Ace bottom brackets.

The notion that Dura-Ace hubs uses a different threading threading than other Shimano hubs, likely stems from the fact that some Dura-Ace Uniglide freehubs (i.e. cassette style) used a smaller pitch diameter for the outer, threaded cog, to accommodate a smaller cog for higher gearing. With the exception of a rare French threading option on 1st generation Dura-Ace, all Shimano freewheel hubs and freewheels are English threaded.

The subject freewheel should be compatible with the subject hub. The fact that the Dura-Ace freewheel goes onto the BMX hub would seem to corroborate this. As suggested, the tighter fit is likely due to new threads running at opposite ends of tolerance limits, while the other hub and freewheels have slightly looser "used" threads.
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Old 03-11-20, 07:57 AM
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Originally Posted by rccardr View Post
Not true. All Shimano hubs, including Dura Ace, use the same freewheel threading patterns and sizes.

Additionally, there wer no 6400 freewheels as this was the first Shimano group to be sold exclusively with freehubs.

You may be confusing this with a series of Dura Ace 7400/7401 freehubs, which had a reduced size threaded end to accept smaller first cogs.
I agree with your last point but not the first two. First generation Dura-Ace freewheels and hubs were available in a French threading option, though they are rare. Also, 600 Ultegra (6400 series) was not the first Shimano group available only in a freehub version. The 2nd generation EX series and 3rd generation AX series of both Dura-Ace and 600, were freehub only. The reason for this was that Shimano continued to offer the 1st generation versions concurrently with these groups,allowing Shimano to push their new freehub/cassette technology, while still providing consumers and bicycle manufacturers with a freewheel option.
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Old 03-13-20, 08:18 PM
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I got the freewheel and hub back from my LBS and I've always had confidence that he'd get me out of a bind.

As I suspected the NOS theory was the issue. One thread needed to be "worn down" a bit. Attached are pics of before and after.


At first only 1/4 of the threads went smooth before locking.




After my LBS put in work


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Old 03-13-20, 08:19 PM
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*Dont worry the freewheel isn't tightened at all on the hub*

Thank you all once again for the input and help. Much appreciated
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Old 03-13-20, 09:13 PM
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Originally Posted by malcala622 View Post
*Dont worry the freewheel isn't tightened at all on the hub*

Thank you all once again for the input and help. Much appreciated
I was going to say that you'll never build the wheel now... good to know things worked out.
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