What does the Sag Control option do?

Sag control, Zero Pre-load (ZPS), no load and race series all describe the same thing.

The TCS Sag Control Option is the correct way to lower  the ride height of your quad.  Lets say you took your stock shocks and installed shorter springs.  Since the shock itself has not been valved correctly for this situation, you would probably bottom out over every jump, whoop and bump! You would end up with a ride that would be virtually unbearable.  The Sag Control option (or zero preload as most people call it) allows for the lower ride height that you would want for a motocross track without sacrificing ride quality.  The lower height will allow you to corner far more quickly and since the shocks are valved properly, allow you to absorb far more impact on jumps than you would be able to with standard ride height shocks.  The wheels will drop in and out of holes on the track much quicker without loosing any stability that might normally cause you to get bucked off your quad!

Is this the correct option for you? 

If you have a Z400, 400EX, or any other quad that sits rather low to start with, and you want to ride off-road, probably not.  If you have a Raptor, DS650 or any other quad that sits rather high, this may be an option for you!

If you primarily ride motocross, no mater what quad you ride, this IS the correct option for you!!!