These are crossover collars from Schmidty Racing Suspensions to convert the OEM, Fox Podium and Performance series shocks found on Polaris RZR, Honda Talon, Can-Am, and Yamaha YXZ into into truly adjustable dual rate shocks. These collars will thread right onto the OEM shock body without any shock modification. They allow you to adjust when to transition from both springs being active to where the shock transfers to the lower main spring alone, giving you the secondary spring rate.
2.0" collars will only work with 2.5" ID springs. Known to fit Polaris Robby Gordon 800-4, RZR 800-4, RZR XP900 (2 seat), RZR 900, RZR 1000S, Honda Talon (2-seat X, front and rear) and (4-seat X, front), Can-Am Commander, Can-Am Maverick (with 2.0" shocks); other models.
2.5" collars will only work with 3.0" ID springs. Known to fit front 2.5" IBP shocks on XP1000 Turbo (2 and 4 seat) and Fox Edition 1000; Honda Talon (2-seat R, front and rear) (4-seat X, rear), Can-Am Maverick with 2.5" shocks, front 2.5" IBP shocks on Can-Am Maverick X-3; Yamaha YXZ; other models.
3.0" collars will only work with 3.75" ID springs. Known to fit rear 3.0" IBP shocks on XP1000 Turbo (2 and 4 seat); Fox Edition 1000; rear 3.0" IBP shocks on Can-Am Maverick X-3; other models.