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45 degree...

http://www.parktool.com/repair/readhowto.asp?id=68

"The "IS" system is considered the most common. The name Integrated System is not a registered trade name. The system uses the 45-degree bearing contact in the frame. The bearings for the 1-1/8 inch steering columns use a 41mm outside diameter with a 45-degree bearing contact in the frame. The bearing may be marked "36-45". The first number refers to the inside bearing contact with the headset race or centering cone. The second number refers to the frame contact."
 

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Discussion Starter · #3 ·
But there is also 45/45 which I am sure campy headsets are.

I bought this fork as an upgrade, and have tried it on 2 different bikes but couldnt get the play in the headets adjusted out. So am trying to workout why.
 

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OOPS, its 36...

C-40 said:
http://www.parktool.com/repair/readhowto.asp?id=68

"The "IS" system is considered the most common. The name Integrated System is not a registered trade name. The system uses the 45-degree bearing contact in the frame. The bearings for the 1-1/8 inch steering columns use a 41mm outside diameter with a 45-degree bearing contact in the frame. The bearing may be marked "36-45". The first number refers to the inside bearing contact with the headset race or centering cone. The second number refers to the frame contact."
The statement above is a bit confusing. I took a more careful measurement of a spare bearing I have and found the chamfer on the inside surface to be .050 in wide, but .070 deep. That means it's a 36 degree angle, not 45.
 
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