bought the shock therapy spring set up for my X-4 3 weeks ago made a big difference in the ride, bought the reservoir caps with the schrader valve from Schmidty racing last weekend and charged the shocks to 210 psi. Totally different machine. Foot stays on the throttle,goes thru the bumps at speed,no need to back out of the thottle for the big Gs, rocks and whoops no problem huge improvements
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