Bought used Cannondale Optimo 2 - questions on assembling headset

[tookurjob]

As you can see, the top spacer is moving after assembly. I am pretty sure that top spacer is supposed to be quite firm.

Here are all the parts I found after disassembly. Anything missing from this leading to loose headset?

Not sure why this is not seated correctly

Is this expander + top cap supposed to go into the head tube directly? I don't under the mechanism of this. So the top cap can be screwed separately but so can the bolt inside of this piece (whatever its name is?)

I couldn't seem to find any instructions on this assembly or figure out the missing piece. The headset seems be called "SI integrated System".

 

[tookurjob]

Is this the correct way to put the compression ring i.e. inside the top bearing?

 

[Smokin Joe]

As you can see, the top spacer is moving after assembly. I am pretty sure that top spacer is supposed to be quite firm.
View attachment 689657
Here are all the parts I found after disassembly. Anything missing from this leading to loose headset?

View attachment 689659

Not sure why this is not seated correctly
View attachment 689660

Is this expander + top cap supposed to go into the head tube directly? I don't under the mechanism of this. So the top cap can be screwed separately but so can the bolt inside of this piece (whatever its name is?)
View attachment 689662

I couldn't seem to find any instructions on this assembly or figure out the missing piece. The headset seems be called "SI integrated System".

The aluminium piece is called a bung. it has to be tightened in place (Not too much torque so you don't over stress the steerer) before you tighten the top cap to remove slack in the bearings.

 

[Big John]

Unless I'm going daft that spacer simply isn't needed. It's not sitting on the steerer tube, which is where a spacer should sit whether it's below or above the stem. Just take it off and see what happens when you tighten everything up.

 

[All uphill]

https://support.cannondale.com/hc/e...53-Start-Here-Find-Your-Bike-s-Assembly-Video

This may help.

There is a video that covers all Optimo versions.

 

[boydj]

The top cap should be tightening onto a spacer or the stem. It looks like yours is tightening onto the top of the steerer.

 

[Jameshow]

Some people also suggest putting a spacer or two above the stem so that it isn't clamping the edge of the stear tube?