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Dura Ace 7800 freehub body swap

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Dura Ace 7800 freehub body swap

Old 04-13-16, 03:37 PM
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Dura Ace 7800 freehub body swap

There's like new Dura Ace 7800 wheelset on my local CL for very tempting price. It comes without cassete. I'm contemplating buying it, however incompatibility issue comes in...

The question is: is it possible to swap proprietary DA 7800 freehub body to 7- or 8-speed freehub? Which obstacles may appear on this way? Can I detach DA freehub using 10 mm allen key like in every other Shimano case and just install ye olde 8-speed body from Shimano 600 6207 hubset? Among many fancy wheelsets (which look just ugly in most cases) this one is true beauty. Wanna use it on my steel bike. Don't wanna upgrade transmission to 10 or 11 speed and there's no way I would pay exorbitant price for proprietary 10-speed wear part.

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Old 04-13-16, 06:39 PM
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Nope, no can do. Tried it, the body flange is a different diameter.
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Old 04-13-16, 07:04 PM
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Originally Posted by rccardr
Nope, no can do. Tried it, the body flange is a different diameter.
+1

Best you can do is de-spoke the wheel and replace the entire hub.
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Old 04-14-16, 12:32 AM
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It's a pity, because the hub itself looks amazing. Thanks for responses!
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Old 04-14-16, 12:40 AM
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Originally Posted by rccardr
Tried it, the body flange is a different diameter.
May you tell me, please, what's inside the hub? I guess, the body flange is bigger in diameter than the seat cluster in the hub, right? Is it an option to dremel off some millimeters from the hub shell?

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Old 04-14-16, 05:33 AM
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Sadly, the 11 speed freehub cannot be machined to fit the earlier hub body. On the other hand, new 11 speed hubs are pretty cheap right now, hardly more than the freehub by itself.
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Old 04-14-16, 08:34 AM
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The WH-7800 hub used a completely different format from prior and subsequent Shimano rear freehubs. First, the freehub body is not bolted to the hubshell with the common 10 mm hollow bolt like most other Shimano hubs and is closer in design to Campy freehubs. Second, the driveside bearings are inboard of the freehub body which is an inherently "inferior" design but compensated for, like Campy, with an oversize axle. Finally, the aluminum freehub body has extended splines and, as you discovered, is 10-speed cassette only.

So, no, no other freehub body can be substituted for the 7800 body.
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Old 04-14-16, 10:25 AM
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HillRider, thanks for detailed response! I'll look for another wheelset then.
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Old 04-14-16, 12:10 PM
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Originally Posted by Lonesome rider
There's like new Dura Ace 7800 wheelset on my local CL for very tempting price. It comes without cassete. I'm contemplating buying it, however incompatibility issue comes in...

The question is: is it possible to swap proprietary DA 7800 freehub body to 7- or 8-speed freehub? Which obstacles may appear on this way? Can I detach DA freehub using 10 mm allen key like in every other Shimano case and just install ye olde 8-speed body from Shimano 600 6207 hubset? Among many fancy wheelsets (which look just ugly in most cases) this one is true beauty. Wanna use it on my steel bike. Don't wanna upgrade transmission to 10 or 11 speed and there's no way I would pay exorbitant price for proprietary 10-speed wear part.
Is it not possible to install an 8-speed cassette on these hubs (possibly needing a thin spacer)?
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Old 04-14-16, 12:32 PM
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No. I thought with some modification (I'm ready for that) it is possible to install conventional Shimano freehub, but not in this case. Bummer. Sorry for repeating what was said previously: this particular wheelset is true thing of beauty and I'd like to use it on my beautiful steel bike. The look is the sole reason I've put Dura Ace 7800 on my road map. Other unconventional wheelsets (i.e. not just usual 36 hole rim laced to usual 36 hole hub) look ugly as sin.

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Old 04-14-16, 12:39 PM
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Originally Posted by Lonesome rider
No. I thought with some modification (I'm ready for that) it is possible to install conventional Shimano freehub, but not in this case. Bummer. Sorry for repeating what was said previously: this particular wheelset is true thing of beauty and I'd like to use it on my beautiful steel bike. The look is the sole reason I've put Dura Ace 7800 on my road map. Other unconventional wheelsets (i.e. not just usual 36 hole rim and usual 36 hole hub) look ugly as sin.
Aw rats, I should have googled that hub first. Bummer!
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