Replacing headset

[lulubel]

I need to replace the headset in my Surly Crosscheck because I damaged the original one when I fitted it (due to not reading the instructions properly) and after nearly 3,500km the bearings are rattling over every bump! At the same time, I'm replacing a standard headset with a cyclocross headset with integrated cable hanger, which will make for a better cable run to the front brake.

Original headset is FSA Orbit MX
New headset it FSA Orbit X-CX

I have all the correct tools required to do this job, and I know what I need to do, so that isn't a problem, but I have a question about the crown race. When I first fitted the headset, I couldn't get the crown race to seat correctly on the fork, despite having a proper tool, and had to take it to the lbs (where the mechanic did it in an irritatingly quick 10 seconds!)

I assume crown races are not standard, but there's a good chance manufacturers will save costs by using the same components where possible across the same line (ie FSA's Orbit line). Do I need to change the crown race, or can I stick with the one I've got? Is there any way to check for certain?

Also, I assume I won't need to replace the star nut. Not a major problem if I have to, but I've got a long steerer tube on the Surly, and I'd rather not spend time pushing the current one through if it isn't necessary.

 

[RecordAceFromNew]

If 3a in here sits just as snug on the old as well as new "crown race" 1, then there is no reason why you need to replace 1. After all it is not really a true race for the bearings to run on - iirc it is just a prop for the bottom of the race in 3a?

You can indeed keep the star nut. While those with OCD might object the general practice even to replace said nut for whatever reason is to just knock the old one down another inch! Some steerers have bottom opening smaller than the internal diameter above, so knocking the nut through might not end up as straightforward as one might hope...

 

[accountantpete]

They both seem to have 36 degree bearings so the crown race will be ok. (The crown race has a slanted bevel of 36 degrees and mates with that slope on the internal bevel on the bearings)

 

[lulubel]

Thanks, guys. That was loads of help. I can get on and do the job happily now.