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7 Speed freehub to use a 9 speed cassette: Wheel is dragging..

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7 Speed freehub to use a 9 speed cassette: Wheel is dragging..

Old 12-27-20, 03:41 PM
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fender1
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7 Speed freehub to use a 9 speed cassette: Wheel is dragging..

Helping a friend with a Kestrel 200 that he snagged inexpensively off of Craigslist.





It came with a full 105, 7 speed group and we were working to change the drivetrain over to 9 speed. He had a set of 9 speed bar-end shifters he wanted to use.

The issue is with the new 8/9/10 speed freehub body installed, the wheel drags when installed in the frame. Even with the quick release engaged at the absolute minimum, one cannot back pedal without the chain bunching up and while pedaling forward there is considerable drag.

The cranks are adjusted properly ( cup / cone style BB), the cups/cone in the freehub are also adjusted properly and have fresh grease. The new freehub & new 9 speed cassette are direct Shimano replacements.

The frame is 130mm spacing and I put a longer axle in to take into account for the new freehub body.

The new freehub body does not sit completely flush and a spacer needs to be removed to allow it to sit lower.


Old 7 speed freehub body

Spacer

105 rear hub

Hub without spacer

8/9/10 freehub installed

See the gap between hub body and shell?

There are also 2 rubber cone seals on each side of the hub. Might they be a factor?

Thoughts from the group**********

Last edited by fender1; 12-27-20 at 04:20 PM.
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Old 12-27-20, 04:52 PM
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Appears to be an incompatibility of the new freehub body and the hub shell. Shimano has a few different variations of how deep the freehub body is. Most are reasonably flush in back of the freehub body and some have deeper protrusion. This body appears to be too deep for the shell. Is the last picture posted with the spacer? and is this still dragging?

What model hub is this new freehub body designed for? Not sure what you mean by "direct Shimano replacement" since Shimano didn't really ever have a 9/10 speed part for the FH-1055. They had a 8 speed body but that was really short and didn't always work well with all 9/10 speed cassettes.

Otherwise nice frame, seems to be in great condition.
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Old 12-27-20, 05:09 PM
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Are you sure the chain isn't rubbing on the inside of the dropout?

As long as everything is assembled and adjusted correctly and the freehub body isn't binding when you turn it by hand it should not bind in the frame. Is the big cog hitting the spokes?
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Old 12-27-20, 05:17 PM
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It seems there is more than one problem here.
Impaired coasting = failure of the ratchet mechanism in the freehub. Dollars to donuts, absence of that spacer is causing something that moves to rub against something that doesn't, that the spacer was meant to keep from touching. Likely some part of the freehub body against the outer face of the hub shell...not the edge where the gap is.
Excess drag in the forward direction with pedaling = something other than the ratchet. If not tire against frame or rim against brake, too-tight axle cones would be the first obvious thought. But they have to be really tight to drag a pedaled wheel. The little rubber cone seals do add to a bit of finger drag and make it hard to hit the sweet spot during adjustment. But they don't add detectable drag when pedaling because the angular momentum of the wheel swamps the seal drag. So I suspect removing a part that's meant to be there is likely the culprit for that, too. Granted from my understanding of how these hubs are made I don't see how the loss of the spacer would lead to too much axle resistance.

Before you installed the wheel in the bike, after the transplant, did the axle spin smoothly in the hub, and did the freehub ratchet click-click-click smoothly when you turned it backwards by hand?

Whatever, suggest putting the spacer back in and rechecking for function. If the resulting gap between hub shell and freehub body is unsatisfactory, you are out of luck.

The original freehub is a Uniglide, btw. Do you know if Hyperglides are even meant to be swappable for Uniglides? I don't. But I know that even Hyperglide for Hyperglide (like going from 7 to 9) doesn't always work well. They'll bolt on OK but there sometimes is a gap that is unacceptable. (Wider than the one you show, without your spacer.)
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Old 12-27-20, 05:30 PM
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Originally Posted by conspiratemus1 View Post
It seems there is more than one problem here.
Impaired coasting = failure of the ratchet mechanism in the freehub. Dollars to donuts, absence of that spacer is causing something that moves to rub against something that doesn't, that the spacer was meant to keep from touching. Likely some part of the freehub body against the outer face of the hub shell...not the edge where the gap is.
Excess drag in the forward direction with pedaling = something other than the ratchet. If not tire against frame or rim against brake, too-tight axle cones would be the first obvious thought. But they have to be really tight to drag a pedaled wheel. The little rubber cone seals do add to a bit of finger drag and make it hard to hit the sweet spot during adjustment. But they don't add detectable drag when pedaling because the angular momentum of the wheel swamps the seal drag. So I suspect removing a part that's meant to be there is likely the culprit for that, too. Granted from my understanding of how these hubs are made I don't see how the loss of the spacer would lead to too much axle resistance.

Before you installed the wheel in the bike, after the transplant, did the axle spin smoothly in the hub, and did the freehub ratchet click-click-click smoothly when you turned it backwards by hand?

Whatever, suggest putting the spacer back in and rechecking for function. If the resulting gap between hub shell and freehub body is unsatisfactory, you are out of luck.

The original freehub is a Uniglide, btw. Do you know if Hyperglides are even meant to be swappable for Uniglides? I don't. But I know that even Hyperglide for Hyperglide (like going from 7 to 9) doesn't always work well. They'll bolt on OK but there sometimes is a gap that is unacceptable. (Wider than the one you show, without your spacer.)
Thanks. The wheel spins fine without the quick release engaged. Sooo, cones to tight maybe?
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Old 12-27-20, 05:57 PM
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Originally Posted by fender1 View Post
Thanks. The wheel spins fine without the quick release engaged. Sooo, cones to tight maybe?
The cones and seals are often different between freehubs and are not compatible. So if you used the old ones it may not work.
And you probably didn't need the new axle the old one would likely work and engage the dropouts perfectly fine if a couple of mill short each side.
How does it spin installed with the skewer open?
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Old 12-27-20, 06:06 PM
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KCT1986 has it right, and I've experienced this exact sort of issue many times over the years.

The problem is that there really is no database or critical specification provided by Shimano that would inform as to which freehub bodies are compatible with which hubshells.

Most recently, I tried upgrading an Ultegra 64xx 8s hub with a titanium body from a 7700 hub, but had the exact sort of problem you are having here.

I always stick with experimenting only with freehub parts that I have on hand, so no great loss when my intentions are foiled by another case of incompatibility.
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Old 12-27-20, 06:12 PM
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Another issue with swapping freehub bodies is incompatibility of the axle and sealing hardware of one hub with any different FH body.
So I always keep the original axle hardware and freehub body together when attempting to swap the body to a different hubshell, else the spacing ends up all wrong and the sealing mechanisms don't come close to working as intended.

Shimano did such a good job of optimizing all of the lateral spacings while maintaining great wheel-dish and keeping the smallest cog close to the dropout, so this leaves no tolerance for making changes in most cases, unless you keep the parts-swapping within the same (64xx, etc.) product family AND keep all the original axle and sealing hardware together with the freehub body that you want to use.
There are of course a large number of product families from Shimano over the years, so there are a lot of fh swap cases that can be found to work just fine, but you have to research these situations yourself as there is no known database of application info afaik.

Last edited by dddd; 12-27-20 at 06:22 PM.
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Old 12-27-20, 07:31 PM
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Originally Posted by fender1 View Post
Thanks. The wheel spins fine without the quick release engaged. Sooo, cones to tight maybe?
No.

It's true that tightening the QR fully will make the cones a tiny bit tighter but this will not be detectable in pedaling. (To prevent premature wear of the cones you're supposed to adjust them so there is minimal play with the locknuts tightened. Then when you clamp down the QR the play is taken up and the cones are then just right. But even if your cones are "too tight for perfect", you won't feel drag from pedaling. You can only feel this by twiddling the axle with your fingers.) Besides, you said in your OP that the wheel dragged even with the QR barely closed.
Something is rubbing that isn't supposed to, and likely wouldn't if you put the old Uniglide freehub back on and developed a Plan B for your friend.
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Old 12-27-20, 09:15 PM
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I'm near-certain that a correct axle assembly and freehub body for this application can be sourced from this 1055/56 series of 8-speed freehub.

Usually a discarded bent wheel is the best source of such parts. I would never buy these kind of parts new, since a complete used wheelset would cost about the same.
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Old 12-28-20, 10:13 AM
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Thanks everyone for replies/help. Now I know what I need to look for. Might anyone have the 105, 8 speed internals they would be willing to part with?
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Old 12-28-20, 01:13 PM
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Based on the way the freehub body looks in the OP's pics, the problem is with the new freehub body. In the pic below of the FH-6500, the protrusion is deeper than what is normal for the OP's hub shell. My guess is that the replacement body is similar to this and when installed without the spacer, the area marked by the arrow is dragging on the hub body.

Compare to the pic of the FH-4500 body, that has a shorter protrusion which is similar to the original body. This style is very common on many Shimano freehubs.

The cone & seals may be an issue, but most Shimano hubs use a similar setup. If the original hub uses the common rubber seal ring, many of the 9/10 speed bodies are compatible.

My take is that with a more suitable freehub body the hub should be fine.





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Old 12-28-20, 03:00 PM
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Originally Posted by KCT1986 View Post
Based on the way the freehub body looks in the OP's pics, the problem is with the new freehub body. In the pic below of the FH-6500, the protrusion is deeper than what is normal for the OP's hub shell. My guess is that the replacement body is similar to this and when installed without the spacer, the area marked by the arrow is dragging on the hub body.

Compare to the pic of the FH-4500 body, that has a shorter protrusion which is similar to the original body. This style is very common on many Shimano freehubs.

The cone & seals may be an issue, but most Shimano hubs use a similar setup. If the original hub uses the common rubber seal ring, many of the 9/10 speed bodies are compatible.

My take is that with a more suitable freehub body the hub should be fine.





Thanks for this.
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Old 12-28-20, 09:55 PM
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Originally Posted by conspiratemus1 View Post
The original freehub is a Uniglide, btw. Do you know if Hyperglides are even meant to be swappable for Uniglides? I don't. But I know that even Hyperglide for Hyperglide (like going from 7 to 9) doesn't always work well. They'll bolt on OK but there sometimes is a gap that is unacceptable. (Wider than the one you show, without your spacer.)
I just want to point out that my 1055 hub originally came with the dual UG/HG compatible bodies, with threads for both UG and HG cassettes. OPís photo is not inconsistent with that type.

Iíve also successfully replaced old 7-speed UG bodies from 1050 and 600 hubs with crossover UG/HG hub bodies, with no running problems at all.
I did however retain all spacers with their hubs.

Of course, this doesnít speak to OPís issue with the 9-speed body. I would suspect the missing spacer as the likely culprit.
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