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Join Date: Feb 2009
Location: BC
Posts: 85
Bikes: Nishiki Superbe, Marinoni Custom SL, Giant TCR Hybrid, Giant TCR 0 Team, Colnago Dream Plus, Trek 2000, Centurion Ironman Master. Giant Cypress-R CX, Kona Muni-Mula ("Colonel Mustard"), Giant TCR2, Giant Defy Alliance 0, Giant TCR Advanced SL 1 ISP
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A few things to check out: 1) Not all Gripshifts are Shimano compatible; you didn't mention which model you had; 2) Even if the Gripshift is Shimano compatible, the shifting will be poor when paired with a Shimano rear D using the linear spring (not enough return force); 3) And a gummed out or kinked or rusted cable may not help matters, either. Luck.