Shock Absorber Type 641 CompetitionThe Triumph Tiger Sport 660 is delivered with linear fork springs. The Wilbers upgrade uses progressive fork springs for a more responsive front end and substantially more reserve in the second spring rate than the stock linear design. The standard fork is also slightly overdamped in rebound; our setup corrects this for a smoother, more controlled ride. At the rear, the OEM progressive spring has a very poor block value that keeps the rider riding in
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