Senior Member
Join Date: Mar 2007
Location: SF Bay Area, East bay
Posts: 7,659
Bikes: Miyata 618 GT, Marinoni, Kestral 200 2002 Trek 5200, KHS Flite, Koga Miyata, Schwinn Spitfire 5, Mondia Special, Univega Alpina, Miyata team Ti, Santa Cruz Highball
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If the cassettes are the same number of cogs try switching wheels with your blue bike. Sometimes a heavier set will make a bike feel sluggish. Not going to comment on fit since you are happy with it.