Bikenut61

I have a WH-6600 hub, which has raised splines halfway down the length of the spline. This came on a 2010 Roubaix. I would like to change the cassette, but cannot find compatible cassettes. Would a current model Ultegra 10sp freehub body fit on this hub?

HillRider

If it's a standard WH-6600, yes it will accept any 8,9 or 10-speed Shimano or SRAM cassette. I'm not sure what you mean by the splines being "half way" down the body unless someone changed the freehub body on yours for an older one.

Bikenut61

Down the length of each spline, halfway down the length the height of the spline increases. It is short the first hald, then doubles in size the rest of the way.

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Dave Mayer

Right: Shimano's short-lived 10-speed only freehub design. Will only accept 105, Ultegra and Dura-Ace 10-speed cassettes.

You can tell by looking at the deep splines on the larger cassette cogs.

maddog34

Shimano Ultegra WH-6600 Rear Wheel 9/10 speed Size 700x23C 20 Spoke | eBay

davidad

No. The freehub is unique to that time frame. shimano gave up on that style rear hub.

HillRider

+1 I read it as a 6600 hub, not the complete prebuilt wheel.

Bikenut61

Correct, 6600 hub. So, will any 10sp freehub body work to replace the existing body?

Dave Mayer

I have disassembled about every Shimano hub ever made, but not the 6600. I have serviced 7800 hubs, which may be similar. The 7800 hubs contain very unique parts that are not cross-compatible with anything else. Hence why they clutter up Ebay year after year.

I suggest stocking up on 105, Ultegra or Dura-ace 10-speed cassettes.

BTW: The Ebay posting provided above is in error: the freehubs on the 6600 hubs are not compatible with any 9-speed cassettes from any vendors. Nor 8 or 11 speeds either.

Bikenut61

Dave, I cannot even find the correct 6600 cassettes. I would prefer Ultegra, 11-30t. Can you recommend a source for these?

maddog34

i posted an image of the freehub... the entire listing comes up instead... no info in the listing except to say that the wheel assy. is in good condition.... might be that the seller got flamed for posting info that was incorrect, then edited the listing....

i just wanted to end the discussion on whether the splines were taller, or not.... hadn't ever looked at the text in the listing...

desertdork

10sp cassettes of that generation maxed at 27t. There should be some out there. I have new 12-27 cassettes in CS-5600 and/or CS-6600 if you can't locate anything.

70sSanO

If I understand the compatibility issue correctly, you can find CS-5600 12-27 cassettes on eBay for $70.00. Or you can replace your wheelset and then you have more options.

John

shelbyfv

I may have missed it but it's still not clear to me whether OP is talking about the hub from the prebuilt wheelset or the stand alone 6600 hub. Sounds like the prebuilt, don't think the stand alone ever came with the restrictive freehub. If it is the prebuilt, it won't swap for a different freehub.

HillRider

That was my confusion too as I noted above. If he has the stand-alone HB-6600 is should take any 8,9 or 10-speed cassette. If he has the WH-6600 prebuilt wheel or a hub removed from one of those wheels, yes, it will have then taller, more limiting splines.

Bikenut61

I have the WH-6600 pre-built wheel.

HillRider

You are limited to the freehub body on it and the 10-speed cassettes that were designed to fit those taller splines.

That wheel's hub, and it's Dura Ace contemporary hub and prebuiit wheel (HB-7800 and WH-7800), used a different freehub and hub bearing design than any other Shimano freehub before or since. The drive side bearings were inboard of the freehub body, not at the outer end of the body, and these bodies are unique to these hubs.

The taller splines were used to let Shimano provide a lighter aluminum freehub body without the cogs gouging them. It was considered a failed experiment and Shimano quickly reverted to the outboard driveside bearing and steel or Ti freehub bodies with the older short splines.

Bikenut61

I have not been able to find anything.

HillRider

You didn't look very hard.

Here is one source: https://www.biketiresdirect.com/prod...CABEgJE0vD_BwE

And another: https://www.biketiresdirect.com/prod...CABEgJE0vD_BwE

And yet another: https://www.performancebike.com/webap...SA_Catch%20All

Bikenut61

[QUOTE=HillRider;19853226]You didn't look very hard.

Here is one source:


Thank you for the links!

bluehills3149

Here's a pic from the ebay ad..

RichCH

Hi I joined the forum and resurrected this old thread as I've discovered that a fulcrum 5 / 7 racing freehub body (17mm not the 12mm) fits the wh6600 hub. There is a very slight rub and it isn't perfectly smooth, I think a suitable washer will resolve slight rub - (to be investigated) but it does allow for a simple upgrade to 11 speed on these older rims. I imagine it is the same as the Dura ace 7800. I've not found any mention of this eslewhere on the web, hence the post.

RichCH

Ok its a little bit more complicated than I first presumed but I now have a perfect fix. The fulcrum freehub body where the pawls are located is 0.34mm larger in diameter than the 6600 freehub body, this is what causes the "rub" as one point seems to catch against the catches in the hub body, I used a dremel and polished off ~ 0.1mm all around (after removing the pawls and spring) to achieve roughy the same OD. This takes < 5 mins as it is such a small amount of soft steel. I then checked the fit and hey presto - no rubbing. I then used the pawls from the old 6600 hub along with the new spring, removed the black gasket/seal on the 6600 hub (it may work just as well removing the blue seal from the fulcrum freehub but I haven't tried this) and am left with a perfect super smooth 11 speed freehub.

knoeblm

Hello, Thank you for this post. I want to build the exact same thing with my Ultegra Wh-6600. Do you have link for the fulcrum Freehub, because I want to use the same?

Do you have any more advises for me?

RichCH

Hi,

I believe it is this one

RS-113 HG
Seems to be a few on ebay for around £40.

It needs to have the 17mm freehub body. The "HG" is for Shimano/SRAM cassettes.

Good luck.