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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I assume the stem is for a threadless fork/headset so it shouldn't matter what the frame is made of.
Carbon fiber seatposts seems to have problems in almost any frame so steel isn't a particular issue. There are a lot of reports of slipping no matter what the seatpost is installed in.