I have a 1999 Litespeed Vortex and I recently installed a 12-27 Shimano Dura-Ace 9-Speed Cassette. The top guide pulley rubs the largest sprocket (27T) regardless of the B-tension adjustment screw setting on the Shimano Dura-Ace 7700 Rear Derailleur. According to Shimano specs the derailleur is compatible with a minimum 11T sprocket and a maximum 27T sprocket. Any advice?



Thanks,

Ed