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Smallest Cog Jammed Against Dropout?

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Smallest Cog Jammed Against Dropout?

Old 04-05-22, 02:05 PM
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1989Pre
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Smallest Cog Jammed Against Dropout?

This seems like the kind of question that's been asked before, but I could not find reference to it.

I have a SRAM 9-speed cassette on my mtb, and I've had this wheel on the bike before, but when I tried to install it, the smallest cog was up against the inside of the dropout, so the wheel wouldn't turn. I compared it to another, similar wheel, and I noticed that on the good wheel, the hub axle protruded past the smallest cog. This is probably what keeps the dropout away from the cog. On the wheel that is not working, the hub axle does not extend past, but resides within the cog. Any ideas on this?
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Old 04-05-22, 02:17 PM
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Missing a spacer or someone changed the cones and the new cones don't have as long a body. Or the cones got swapped to the other side when someone removed it for servicing the bearings. (sometimes cones are different body length, but I only saw that on freewheels) Maybe some other things.

Any ideas on this?

Last edited by Iride01; 04-05-22 at 03:14 PM.
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Old 04-05-22, 02:47 PM
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Why was the wheel taken off the bike?
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Old 04-05-22, 04:11 PM
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If the axle is inside the cog it can't go in any bike
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Old 04-05-22, 05:14 PM
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Originally Posted by cxwrench View Post
Why was the wheel taken off the bike?
To clean the cassette. I am thinking that I do not have the lock-ring tight enough. Does that sound like a possibility?
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Old 04-05-22, 06:41 PM
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Originally Posted by 1989Pre View Post
This seems like the kind of question that's been asked before, but I could not find reference to it.

I have a SRAM 9-speed cassette on my mtb, and I've had this wheel on the bike before, but when I tried to install it, the smallest cog was up against the inside of the dropout, so the wheel wouldn't turn. I compared it to another, similar wheel, and I noticed that on the good wheel, the hub axle protruded past the smallest cog. This is probably what keeps the dropout away from the cog. On the wheel that is not working, the hub axle does not extend past, but resides within the cog. Any ideas on this?
Maybe there’s a spacer in between cassette and hub body that doesn’t belong there.
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Old 04-05-22, 07:09 PM
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If your cassette has a 11t smallest cog, it must be lined up correctly when engaging the lockring. If it rotates out of alignment, the large tab will interfere with the freehub's spline and not 'nestle' down properly into the recess on the 2nd smallest cog.

Is it the cog that is interfering? or the lockring against the dropout?
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Old 04-05-22, 08:19 PM
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Originally Posted by 1989Pre View Post
To clean the cassette. I am thinking that I do not have the lock-ring tight enough. Does that sound like a possibility?
While possible you'd have to pretty oblivious to leave it so loose that it hits the frame.
Originally Posted by Davet View Post
Maybe there’s a spacer in between cassette and hub body that doesn’t belong there.
OP took off a cassette that was not hitting the frame to clean it...I somehow doubt that he spotted a random spacer laying around and thought he should add that. Possible, but highly unlikely.
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Old 04-06-22, 04:07 AM
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Originally Posted by KCT1986 View Post
If your cassette has a 11t smallest cog, it must be lined up correctly when engaging the lockring. If it rotates out of alignment, the large tab will interfere with the freehub's spline and not 'nestle' down properly into the recess on the 2nd smallest cog.

Is it the cog that is interfering? or the lockring against the dropout?
After reading the replies, I am under the impression that it may be the outer cog that is not seated properly on the splines. I'll review a couple installation/assembly videos and see if I neglected something.
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Old 04-06-22, 04:08 AM
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Originally Posted by KCT1986 View Post
If your cassette has a 11t smallest cog, it must be lined up correctly when engaging the lockring. If it rotates out of alignment, the large tab will interfere with the freehub's spline and not 'nestle' down properly into the recess on the 2nd smallest cog.

Is it the cog that is interfering? or the lockring against the dropout?
I think you are on to something. I'm going to take it apart again and pay attention to what you said.
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Old 04-06-22, 08:12 AM
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I got the wheel onto the bike, but the 11T is still jammed up against the dropout.
Here's a photo, and it look to me like the second-smallest cog is a larger distance
away from the third-smallest. Do I have it not seated right?

Last edited by 1989Pre; 04-06-22 at 09:21 AM.
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Old 04-06-22, 09:20 AM
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Originally Posted by 1989Pre View Post
I got it to line up and now I'm okay. Still not sure what I did right and wrong, but I
pulled the lock-ring off and made sure the 11T was seated properly. All I needed was
to sleep on it and approach it with a fresh head, I guess. Thanks to all.
Glad that it worked out. With the 11T, the cog doesn't engage a lot of the freehub's spline and can rotate out of position when the lockring is started if you aren't careful.

It's also possible to have the 11T cog in the wrong alignment and it will appear OK, but it will not seat into the recess of the next cog.
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Old 04-07-22, 09:06 AM
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I thought I had it, but I spoke too soon (I edited my above comment). I'll keep working on the alignment of the grooves on the splines. It's a Shimano Deore hub and SRAM cassette, if that helps.
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Old 04-07-22, 09:47 AM
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It's either lined up correctly or it isn't...what's so hard about lining up the splines and tightening the lockring? Hold the 11 cog in the right spot as you start to tighten the lockring by hand, then get the tool on it and crank it down. If you don't hold the cog in position it can move but that should be very obvious.
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Old 04-07-22, 10:32 AM
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Originally Posted by 1989Pre View Post
I got the wheel onto the bike, but the 11T is still jammed up against the dropout.
Here's a photo, and it look to me like the second-smallest cog is a larger distance
away from the third-smallest. Do I have it not seated right?
If the issue is with the 2nd & 3rd smallest cog, check that the screws holding the larger cogs is not interfering with the proper seating of the 2nd.
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Old 04-09-22, 08:18 PM
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The 11 is touching the droput even though the chain can shift on to the 11 ?
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