FSA Campy 45 headsets...what does the cap size mean?

tomstickland
tomstickland Posts: 402
edited January 2013 in MTB workshop & tech
I've got a 2011 Specialized Camber comp with an FSA headset.
Obtaining the bearings for it was a real problem - people kept selling me 45 degree campy bearings that didn't have a large enough chamfer on them.
In the end I bought a headset on Chain Reaction.

http://www.chainreactioncycles.com/Models.aspx?ModelID=9069
I couldn't work out what the top cap options were so I went for the 8mm to see what would arrive.
The bearings fitted but some of the spacers didn't.

I've just ordered a 15mm top cap version and will see what happens with that.

Any better ideas? I don't understand why obtaining bearings for this is so complicated.

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