Headset Help
 

I'm replacing my headset on my 1989 De Rosa Professional as it was 1/2 campy and 1/2 Shimano 600. I'm a newbie at this, so can anyone steer me in the right direction (pun intended :lol:) as to what I need to order? I guess my biggest concern is about the threads. I have no idea if on this year whether it would have been considered "Italian" or if it is ISO. It does have the original 1" steerer tubed forks. I understand the threads were cut different if it's Italian, but I would have not idea how to check that.

Thanks in advance.

The ISO and Italian fork threads are the same diameter and pitch, except that 1" ISO (BSC) has standard 60° thread forms and the Italian 25.4mm is a Whitworth 55° profile.

They're close enough that folks have long since stopped worrying about the difference.

Usually, the underside of the locknut has the thread info stamped in, or if you have a magnifying glass, thread form gauge and good eyes you can read the fork.

Thank you! So if I buy an ISO headset, I should be good?

Yes. Just make sure the stack height of the new headset is compatible with your steerer length. Too short can be handled with spacers. Too high and you are sol.

:thumb: Thanks a million!

So is that 500,000 each?

You bet! I need all the help I can get....

Sounds like the Joe and Willy "cartoon" (and that term is loosely used here) by Bill Mauldin. Joe has just crossed a gap in the battlefield under bad guy fire. he turns to Willy and says " that's another $10,000 I owe you". Meaning that he bet Willy he wouldn't make it once again. Andy (who wasn't born back then but has high regard for those guys).