Dura-Ace 7700 Freehub Body compatibility?
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Dura-Ace 7700 Freehub Body compatibility?
I've noticed that every so often the freehub on my Dura Ace rear hub will skip, nothing major but a bit disconcerting to say the least. I have been a long time user of the Morningstar Freehub Buddy on this hub, and usually give it a gear oil flush every year or so as part of routine maintenance. I remove the freehub body to do this, so I can let the excess oil drain out of the unit (versus all over my hub/spokes or into the greased bearings on the drive side).
Anyway, I was going to try and do a solvent flush followed by one or more lubricant flushes over a period of a couple days to see if that helps. Everything I read on the internet (including Sheldon Brown) said that Shimano 9-speed stuff was interchangeable, so I ordered a Tiagra 4500 9-speed freehub body to put on the wheel for interim use while I worked on the 7700 body. However, when I went to install it, it didn't fit as it seems to be a bit shorter than the 7700 body. It sits too much inboard, and as a result the cassette can't fully seat as it hits the spokes before it goes to the bottom of the splines. Also, the shortness of the body was apparent when I installed the axle and had a bunch of extra length on the NDS end.
There was a thin shim with the replacement body, perhaps I will re-try with that but I was under the impression that this was to replace the existing shim/washer around the hub splines (which fits into a recess in the hub), not sit on top of it as a spacer. Plus, it didn't seem thick enough to resolve the problem I had. Hmmm...
I probably won't ride for the next few days, so I likely will service the 7700 body this weekend so no big deal. While I have it off, I may retry the 4500 body with the shim and see if it works better that way, at least to satisfy my curiosity. If it does fit that way, I will come back and update the post, if for nothing else to help someone else who may be searching about this.
Anyway, I was going to try and do a solvent flush followed by one or more lubricant flushes over a period of a couple days to see if that helps. Everything I read on the internet (including Sheldon Brown) said that Shimano 9-speed stuff was interchangeable, so I ordered a Tiagra 4500 9-speed freehub body to put on the wheel for interim use while I worked on the 7700 body. However, when I went to install it, it didn't fit as it seems to be a bit shorter than the 7700 body. It sits too much inboard, and as a result the cassette can't fully seat as it hits the spokes before it goes to the bottom of the splines. Also, the shortness of the body was apparent when I installed the axle and had a bunch of extra length on the NDS end.
There was a thin shim with the replacement body, perhaps I will re-try with that but I was under the impression that this was to replace the existing shim/washer around the hub splines (which fits into a recess in the hub), not sit on top of it as a spacer. Plus, it didn't seem thick enough to resolve the problem I had. Hmmm...
I probably won't ride for the next few days, so I likely will service the 7700 body this weekend so no big deal. While I have it off, I may retry the 4500 body with the shim and see if it works better that way, at least to satisfy my curiosity. If it does fit that way, I will come back and update the post, if for nothing else to help someone else who may be searching about this.
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They all use different part numbers, Tiagra through DA, FWIW. I too would have thought there was some interchangeability but maybe not.
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I don't know the compatibility range for the 7700 hub. To fit into my Cannondale 126mm dropouts I used a body from an XT-732 on my 7700 and it worked great. But, you don't want a 7 speed freehub body.
I'm "thinking" a body from an XTR-950 might work, but I have not tried it. If that works I have read that the body from an XTR-950, or 910, will fit on an XT-737. One of these days I try it. So if a 950 works a 737 should fit, but I can't verify that.
The trend here is pretty obvious in that compatibility with other 1990's hubs will probably give you a better chance. I'm sure someone has done a swap with a non-ti freehub body.
Whatever comes about from this thread I will file away.
John
I'm "thinking" a body from an XTR-950 might work, but I have not tried it. If that works I have read that the body from an XTR-950, or 910, will fit on an XT-737. One of these days I try it. So if a 950 works a 737 should fit, but I can't verify that.
The trend here is pretty obvious in that compatibility with other 1990's hubs will probably give you a better chance. I'm sure someone has done a swap with a non-ti freehub body.
Whatever comes about from this thread I will file away.
John
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Worked on the 7700 freehub today, gave it a good solvent flush and got all the old lubricant out (and a bunch of other crud). Re-lubricated using the freehub buddy, and a light bead of Teflon grease around the rear-side bearings. Running smoothly, we will see how it performs on the road.
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