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7-speed cassette on 10-speed hub "wobbling"

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7-speed cassette on 10-speed hub "wobbling"

Old 05-23-19, 07:13 AM
  #1  
maartendc
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7-speed cassette on 10-speed hub "wobbling"

Hello all,

I am trying to use a brand new 7-speed cassette on a 9/10/11-speed wheel, for my old Cannondale that has a 7-speed drivetrain. Wheel is a brand new Shimano RS010 wheelset. It is listed as a 9/10/11 speed wheelset / hub.

Now i am trying to install a Shimano HG-41 7-speed cassette on it: https://www.jensonusa.com/Shimano-HG...Speed-Cassette
I am using a 4.5mm spacer from "Problem Solvers" as I have read this is the correct spacer to use to go from 7-speed cassette to 10-speed hub: https://www.treefortbikes.com/Proble...d-Alloy-Spacer

Now when I install the cassette using this spacer, after tightening the lockring down, and spinning the cassette, there is a significant "wobble" from side to side (couple of mm). Meaning it is not sitting perfectly straight on there.

What could be causing this? All parts are brand new. Am I using the wrong spacer? Is the lockring not tight enough? Is the hub messed up? (I used this wheel with a 10-speed cassette briefly, and it seemed fine). The cassette only goes onto the hub one way, so I am sure that is right.

Thank you!
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Old 05-23-19, 07:25 AM
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This is just a guess, but make sure the spacer meets the rivets that hold the cassette together squarely. You might end up notching the spacer to clear the rivets.
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Old 05-23-19, 08:52 AM
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You need another spacer to account for the difference in width between a 10 speed and an 11 speed cassette, 1,85 mm as I recall
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Old 05-23-19, 09:13 AM
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Originally Posted by alcjphil View Post
You need another spacer to account for the difference in width between a 10 speed and an 11 speed cassette, 1,85 mm as I recall
My Shimano RS010 wheel did come with a small 1.85mm spacer I believe: https://www.google.com/search?q=Y4T724000&tbm=isch&source=univ&client=firefox-b-1-d&sa=X&ved=2ahUKEwjQlODt97HiAhWCc98KHcO6C7QQsAR6BAgJEAE&biw=1284&bih=695

I have tried with both this extra 1.85mm spacer and without, but I see the wobble in both cases. I do see that this spacer has some "indentations" on it, perhaps those are not seated correctly or something?

Should the 1.85mm spacer go closest to the wheel center, or closest to the cassette? Perhaps I put the spacer on upside down?

Thank you!

Last edited by maartendc; 05-23-19 at 09:17 AM.
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Old 05-23-19, 09:16 AM
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Originally Posted by 88Tempo View Post
This is just a guess, but make sure the spacer meets the rivets that hold the cassette together squarely. You might end up notching the spacer to clear the rivets.
I see, that is a good suggestion, thanks. I do see there seem to be little rivets on the back of the cassette:

https://www.evolutioncycles.co.nz/as...iew/186822.jpg

Will look for those when I get home. Thanks!
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Old 05-23-19, 09:17 AM
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If you look at the back of the cassette you should see 3 rivets the indents should line up with those.

Looks like we were typing at the same time. I haven't messed with a 11 speed setup yet, but I had something similar happen on a 9 speed hub.

Last edited by 88Tempo; 05-23-19 at 09:20 AM.
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Old 05-23-19, 09:20 AM
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I've only used 7-speed cassettes on nine-speed hubs, so one spacer installed prior to the cassette. Probably, you need two spacers, but should be able to tell before you install the last cog whether you need more spacers.
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Old 05-23-19, 09:56 AM
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High precision comes at a higher cost, so it may be within adequate precision considering the price tag.

the upper pulley float, sideways, is part of an indexed shifting system , so , It compensates

for that little discrepancy..
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Old 05-23-19, 10:05 AM
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Originally Posted by 88Tempo View Post
If you look at the back of the cassette you should see 3 rivets the indents should line up with those.

Looks like we were typing at the same time. I haven't messed with a 11 speed setup yet, but I had something similar happen on a 9 speed hub.
Ah, that would explain it if those rivets stick out.

I believe I put the 1.85mm spacer with indentations at the back, and the flush spacer against the cassette / rivets. That would cause it to wobble because it seems like only 2 rivets stick out.

Thanks so much! I will report back if solved.
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Old 05-23-19, 10:06 AM
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Originally Posted by fietsbob View Post
High precision comes at a higher cost, so it may be within adequate precision considering the price tag.

the upper pulley float, sideways, is part of an indexed shifting system , so , It compensates

for that little discrepancy..
Thanks for the suggestion, but I don't think so.

Like I said, the hub seems fine ("straight") with a 10-speed cassette I have tried it with. Also, the wobble is really significant, I don't think that would be acceptable even on a cheap wheel.

Thanks
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Old 05-23-19, 10:17 AM
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best I can tell you could do 7 speed cassette with spacer on 8,9,10 speed but run into issues with 9,10,11

possibly a 4.5 mm space and a 1.85 spacer.... .

but in any event this is going to be a kludge and probably have on going issues...... too big a technology gap
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Old 05-23-19, 10:33 AM
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another think to consider is that your bike is 99.99% 126 mm spacing and the 9/10/11 is 130...... there is a wide variety of opinion on whether you should put a 130 in an aluminum 126......
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Old 05-23-19, 11:00 AM
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Originally Posted by squirtdad View Post
another think to consider is that your bike is 99.99% 126 mm spacing and the 9/10/11 is 130...... there is a wide variety of opinion on whether you should put a 130 in an aluminum 126......
This is true, but I have been running a 130mm rear wheel for about 4 years now on this bike (I do believe it is 126mm spacing). Never had any problems.

Not sure if it is bad for the frame, but i can just "bend" the rear triangle apart a bit when fitting the rear wheel. Seems to work fine.

EDIT: There seems to be a thread about this here: Cannondale 3.0 frame rear spacing
Seems like others have successfully fit a 130mm into this frame. It really does not take much force at all to bend the frame slightly apart, so I believe it should be fine.

Last edited by maartendc; 05-23-19 at 11:05 AM.
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Old 05-23-19, 12:21 PM
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Originally Posted by maartendc View Post
Hello all,

I am trying to use a brand new 7-speed cassette on a 9/10/11-speed wheel, for my old Cannondale that has a 7-speed drivetrain. Wheel is a brand new Shimano RS010 wheelset. It is listed as a 9/10/11 speed wheelset / hub.

Now i am trying to install a Shimano HG-41 7-speed cassette on it: https://www.jensonusa.com/Shimano-HG...Speed-Cassette
I am using a 4.5mm spacer from "Problem Solvers" as I have read this is the correct spacer to use to go from 7-speed cassette to 10-speed hub: https://www.treefortbikes.com/Proble...d-Alloy-Spacer

Now when I install the cassette using this spacer, after tightening the lockring down, and spinning the cassette, there is a significant "wobble" from side to side (couple of mm). Meaning it is not sitting perfectly straight on there.

What could be causing this? All parts are brand new. Am I using the wrong spacer? Is the lockring not tight enough? Is the hub messed up? (I used this wheel with a 10-speed cassette briefly, and it seemed fine). The cassette only goes onto the hub one way, so I am sure that is right.

Thank you!
Unless you are really attached to your 7-speed shifter, why bother with all this? Put on an 8/9/10/11-speed cassette and a matching shifter and then you won't need to futz with spacers and wobble and everything.

Alternately, if it's possible to swap the freehub body to a 7-speed unit, you could re-dish the wheel and it would be stronger.

The only thing that 4.5mm spacer is good for is wasting opportunity.
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Old 05-23-19, 01:06 PM
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Originally Posted by ThermionicScott View Post
Unless you are really attached to your 7-speed shifter, why bother with all this? Put on an 8/9/10/11-speed cassette and a matching shifter and then you won't need to futz with spacers and wobble and everything.

Alternately, if it's possible to swap the freehub body to a 7-speed unit, you could re-dish the wheel and it would be stronger.

The only thing that 4.5mm spacer is good for is wasting opportunity.
This is a bike with really nice Dura Ace downtube indexed shifters and Dura Ace 7-speed derailleur that are period-specific to the bike. So yes, I'd like to keep it 7-speed.

That being said, the wheels I have now are just ready for the junkyard, and I have a cheap 10-speed wheelset lying around, hence the need to convert.

I will probably invest in some really nice 7-speed freewheel wheels down the line, just not at the moment.
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Old 05-23-19, 03:00 PM
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Originally Posted by 88Tempo View Post
This is just a guess, but make sure the spacer meets the rivets that hold the cassette together squarely. You might end up notching the spacer to clear the rivets.
this may be it..... a comment on the treefort bike site mentioned having to file notches

and it is mentioned in this thread Problem with 7spd cassette on 130mm hub using 4.5mm spacer
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Old 05-28-19, 07:36 AM
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Originally Posted by 88Tempo View Post
This is just a guess, but make sure the spacer meets the rivets that hold the cassette together squarely. You might end up notching the spacer to clear the rivets.
Originally Posted by 88Tempo View Post
If you look at the back of the cassette you should see 3 rivets the indents should line up with those.
Looks like we were typing at the same time. I haven't messed with a 11 speed setup yet, but I had something similar happen on a 9 speed hub.
Originally Posted by alcjphil View Post
You need another spacer to account for the difference in width between a 10 speed and an 11 speed cassette, 1,85 mm as I recall
Just a quick update: You were both right.

It was indeed the rivets holding the cassette together! There were only 2 rivets, making the cassette sit lop-sided against the flush 4.5mm spacer. The 1.85mm spacer actually had 3 notches in it for this purpose, so I just made sure the 1.85mm spacer was up against the cassette, and the 4.5mm spacer behind that.

Works like a charm now, everything straight and tight. Hope this info helps someone who has similar issues in the future. Cutting notches in the flush spacer, or taking out the rivets from the cassette would also have worked as alternative solutions, if the 1.85mm spacer did not have notches.

Thanks everyone!
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Old 05-29-19, 06:23 AM
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How To Install 7 Speed Cassette On 8/9/10 Speed Hub [or 11 Speed]

For future reference, here's a video on the subject.
Just use the wider spacer, or add a 10-to-11 spacer, to make the video apply to using a seven speed cassette with an 11 speed hub.
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Old 05-29-19, 07:37 AM
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Originally Posted by maartendc View Post
This is true, but I have been running a 130mm rear wheel for about 4 years now on this bike (I do believe it is 126mm spacing). Never had any problems.

Not sure if it is bad for the frame, but i can just "bend" the rear triangle apart a bit when fitting the rear wheel. Seems to work fine.

EDIT: There seems to be a thread about this here: Cannondale 3.0 frame rear spacing
Seems like others have successfully fit a 130mm into this frame. It really does not take much force at all to bend the frame slightly apart, so I believe it should be fine.
not sure what Cannondale u have but I have a older one that has downtube shifters and if your bike has the same u can run it in friction mode and use a 8 speed cassette I have done this with hed Ardenne rims and spacing is 126 but rim is 130 and shifts perfect also just used one spacer that was supplied with the rim
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Old 05-29-19, 07:54 AM
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Originally Posted by ridingfool View Post
not sure what Cannondale u have but I have a older one that has downtube shifters and if your bike has the same u can run it in friction mode and use a 8 speed cassette I have done this with hed Ardenne rims and spacing is 126 but rim is 130 and shifts perfect also just used one spacer that was supplied with the rim
I bet that would work, but I hate the friction shifting mode. My downtube shifters can be used both in friction and indexed mode. Indexing is 7-speed.

I live in a rolling hilly area, so constantly shifting up, down, up, down again. I would hate to do that with friction shifters.
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Old 05-29-19, 10:28 AM
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Originally Posted by maartendc View Post
Just a quick update: You were both right.

It was indeed the rivets holding the cassette together! There were only 2 rivets, making the cassette sit lop-sided against the flush 4.5mm spacer. The 1.85mm spacer actually had 3 notches in it for this purpose, so I just made sure the 1.85mm spacer was up against the cassette, and the 4.5mm spacer behind that.

Works like a charm now, everything straight and tight. Hope this info helps someone who has similar issues in the future. Cutting notches in the flush spacer, or taking out the rivets from the cassette would also have worked as alternative solutions, if the 1.85mm spacer did not have notches.

Thanks everyone!
thanks for the update.... to often people do not do that
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