Joined: Oct 2011
Posts: 2,714
Likes: 13
From: Normal, Illinois
Bikes: Trek 600 ,1980Raleigh Competition G.S., 1986 Schwinn Passage, Facet Biotour 2000, Falcon San Remo 531,Schwinn Sierra, Sun Seeker tricycle recumbent,1985 Bianchi Squadra
They might be for oil . People used to do that for faster spins on racing bikes . In Forresters book "Effective Cycling" he was still recommending this in the 80's .