In article ,
ydm9 wrote:
"In general", if you ride a 2003 Trek 2100 which has an aluminum frame
and DOES NOT have carbon seat stays and compare it to a 2004 Trek 2100
which appears to be about the same bike WITH carbon seat stays, how
much difference is there in ride quality?

Near zero.

I would think there would
be a difference in ride quality.

Then there definitely would be a difference... to you.