Help with my aluminium forks

[Pskin132]

Hi guys,

I’m in the middle of respraying my old cannondale badboy 2011. I have sprayed handle bars And headset. After reassembling my forks at the bottom are grinding. I think I’ve lost a rubber gromet or “o” ring from the bottom of the forks where they connect to the frame.

Any help on which part I need please, I know my way around bikes.

The spray isn’t finished yet by the way haha.

See photos

Thank you

 

[Pskin132]

I think it’s called a crown race and my brand is FSA. Do I need to measure it ?

 

[raleighnut]

If it is graunching I'd suspect you've put a bearing in upside down.