Joined: Jan 2009
Posts: 44,302
Likes: 6,559
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
I'm interested in this topic, too. There are so many factors that can cause a placebo effect. There may even be subtle sounds coming from the frame as it goes over bumps, and different sounds, barely perceptible, can make for different impressions.