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Ok, so I was installing a Sram XX 11-36t cassette on the bike last night. Slightly used cassette, bought it from a buddy.

It would not slide onto the freehub budy with the inner sleeve inside. After a bit of gentle pressure, the largest cog (36t) separated from the remainder of the cassette. is this normal? I can't seem to push it back together to make a solid unit. Tried to capture this with a picture.



Any advice?
 

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I think I've read the last cog is replaceable so it might be normal. I have no idea how to get it back together. Can you put it on the freehub an torque the lockring down to press it back together?
 

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If it won't slide onto the cassette body with the inner sleeve there, then there will be some filing work required on the splines of the freehub body. You've probably got some burrs there.
 

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You will have to align and press the 36T cog onto the pins on the steel portion of the cassette (and the sleeve needs to be in there when you do it). It is a press fit because the alloy cog transmits the torque of the steel portion to the freehub. You also need to make sure the 36T cog is pressed on uniformly all the way around, torquing the locknut won't do that out at the edges.

There should be on missing hole in the cog to clock it properly.
 
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