champion city

C&V, I need your help!

I'm in the process of gathering parts for a dura ace 740- series build, and I have been having trouble coming across hubs that aren't Uniglide with dura ace specific threading. In my searching, I have come across these potentially useable hubs that unfortunately have rims attached to them.

https://cgi.ebay.ca/ws/eBayISAPI.dll?...ht_1638wt_1167

According to the seller, they have the elusive Hyperglide/Uniglide accepting freehub body, which is threaded both on the inside and outside. The problem is that the freehub body appears to be damaged, and is missing a visible chunk. This is visible at the following link:
https://www.auctiva.com/hostedimages/...0,0,0&format=0

There are also other issues, as 7400 hubs should not be 8 speed to the best of my knowledge. Should I run the other way, or will they be useable?

cudak888 

If the cassette body is removable, it'll require a TL-FH10 splined remover to pull the fixing bolt/socket out from the inside for the transplant, unlike the more standard 10mm allen key mounting. Sheldon has a few articles on this:

https://www.sheldonbrown.com/k7.html#transplant
https://www.sheldonbrown.com/dura-ace.html#hubs ("Freehub Body/Hub Shell Compatibility")

Harris also shows the tool on their site:
https://www.sheldonbrown.com/harris/tools/cassette.html

That said, if you do succeed in removing it, Sheldon's site would imply that you'd be forced into locating another DA-specific replacement.

-Kurt

jack002

Yeah, that crack in the rim in pic#8 isn't lookin' too smooth either.
Wait, you only want them for the hubs? Ok, never mind.

champion city

Just as I thought.

Kurt, I have looked through Sheldon's compatibility list and I don't see any such thing as a 7 speed Dura ace hub that is hyperglide compatible. Is this correct?
I may just be better off using the 600 hubs I already have with a freehub transplant. I already have a Hyperglide/Uniglide dual-compatible freehub body that should fit it.

cudak888 

Sheldon's comments about 7-speed compatible "freehubs" could be referring to either. One way or another though, that auction you posted is proof enough that there is such a thing as a 7-speed, HG-cassette-compatible, Dura-Ace rear hub.

-Kurt

Allan Pollock

"One way or another though, that auction you posted is proof enough that there is such a thing as a 7-speed, HG-cassette-compatible, Dura-Ace rear hub."

I disagree. Best not to assume that the seller didn't do something dumb like try to thread on something that don't fit!
Allan

miamijim

1. I have no clue what the OP is looking for. He wants to do a 740- build but doesnt want a 7403.
2. As far as I've been able to tell Shimano NEVER made a Dura Ace HyperGlide 7-speed hub. If its HyperGlide its 8-speed. Period.
3. There may have been a short run of 126mm HyperGlide hubs but these are 8-speed.
4. Regardless of it being a Dura Ace hub or cassette the shift levers have NOTHING to do with it. Dura Ace shifters need to paired with a Dura Ace derailleur. Thats it. Everything else can be whatever.
5. It appears there are 8-speed Uni-Glide specific hubs as well

I'm confused. The OP doesnt want Dura Ace specific Uniglide threading but wants 740- hubs which are Dura Ace.

So what the big deal, you want 7-speeds? Jusr remove the low gear cog.

mkeller234

I have a 7 speed, shimano 105 hub with a 7spd HyperGlide cassette. It was factory equipped on my 1990 Trek 1420. Maybe I am not understanding what you are saying?

miamijim

Dura Ace. Shimano NEVER made a 7-speed HyperGlide Dura Ace hub. All Dura Ace HyperGlide hubs are 8 or more speeds.

mkeller234

Ah, I thought you were saying the entire line. I just misunderstood you.

cudak888 

What? For crying out loud, I just linked to half a dozen of Sheldon's pages that show that hybrid UG/HG hubs did exist in one form or another. It's not as if it was impossible for Shimano to thread the outer and inner edges of the cassette body.

Now that I find surprising - only as I've never seen any such thing as 8-speed Uniglide. Would Shimano have actually produced a hybrid freehub requiring anyone utilizing a UG cassette to buy another cog and spacer?

That doesn't sound like something I'd expect from Shimano.

EDIT: I'm looking at the photo now. The width of that cassette body is obviously for 8-speed. Learn something every day.

-Kurt

champion city

Thanks for the Info MiamiJ,

I just thought there was such a thing as a 740- dura ace hub that was 7-speed and hyperglide compatible. I wanted to stay with 7-speed because I have a set of 7-speed dura ace shifters and the 8-speed shifters are a bit rich for my blood right now.

I could easily run a 7402 or 7403 hub with only 7 speeds, through the use of spacers or just to run 8-speeds in friction mode. I was also previously leery about cold-setting the frame to fit a 7403, but it's a small jump, from 126 to 130, so 2mm on each side is barely a concern.


And Kurt, there are 8-speed Uniglide hubs as you have found, but judging by how few seem to be around, they were mostly Hyperglide/Uniglide hybrids. The 8-speed Uniglide DA cassettes aren't particularly common, but there's a few on the 'bay right now:

https://cgi.ebay.ca/NOS-Shimano-Dura-...ht_1698wt_1167

Iowegian

I think the 7402 is the special DA 8-speed uniglide hub that is compatible with nothing else. The 7403 uses a special DA specific freehub and normal 8/9/10 speed cassettes. You can change a 7402 into a 7403 if you have the special tool and can find the special freehub.

I have a 7402 wheelset and was trying to convert it to 7403 for awhile but it seems to be easier to find the 7402 cassettes than the special freehub so I think I'll just leave it as-is and try to stash a few spare cassettes.

Bianchigirll 

Don't forget the seller is wasting $35 of your money for shipping those junk rims. if he takes the hubs out of the wheels he can shipp them USPS express for $4.95.

merlin55

I've got one of these Dura Ace hubs, it is 7 speed and 32 hole, and the 12 or 13 screws on...it doesn't need/use a lock ring. Came on my new Tomasini back in 1990 and was used for years before I rebuilt the wheel with a 8 speed hub. PM me if you are interested and make me an offer for the hub, QR, and Cassette. I can send photos if you want. I seldom rode that bike so the hub look and the berarings feels great,

champion city

Tell me about it. With that, the damage to the freehub and his inconsistent information, I'm going to steer clear.
Again, thanks to all who contributed information. Dura ace can be a strange beast at times, so thanks for educating me.

oh, and Merlin55, I sent you a PM