Sounds odd - we have two cycle-ops, one fluid and one mag, they are both adjustable enough to do just fine on 700's and 650's. If it won't work with smaller wheels it must not be very adjustable?
edit: checked out the Blackburn site and it does say 700 and 26" wheel sizes -but I think they may have just made a typo and left out 650's on that one. The adjustment is generally done by screwing down the roller, so if it fits 700's and 26"ers then it shouldn't have a problem with 650's. You can always call REI before you order it.



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