Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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The cartridge bearing Ultegra/600 heasdet was HP-6500. They date from at least 1995 as I installed one on my new Litespeed that year. They were, BTW, a great headset. Very durable, smooth and a real bargain.
The earlier loose (retainer held) ball 600 headset was, IIRC, HP-6200.
The bearings in these two models were definitely not interchangable.