Race Series and Sport Series is Race Tech terminology to describe two different setup styles. They both employ multiple springs for a progressive feel. They are unique yet one is not being better or worse than the other. Your choice depends on riding type and personal preference.
Race Series (P300) - Race Series refers to our no-preload setup. Race Series allows the ATV to sit lower than stock without sacrificing wheel travel. Ride height is fully adjustable to compensate for various track conditions. This is most commonly a triple rate setup. Typical applications for the Race Series include, but are not limited to, motocross and cross-country racing where a low center-of-gravity and high cornering speed are required
Front kits contain all necessary Springs and Hardware including an assortment of crossover rings for custom tuning where applicable. Instructions give a detailed explanation. Some Kits require disassembly of the shock or minor filing for installation (see www.racetech.com to see which models are affected)
Rear Race Setup - This consists of a Base Unit and a Main Spring. The Base Unit contains the special Race Mounting Hardware and the NPL (no preload) Spring. The Eibach Main Spring must be purchased separately (see www.racetech.com for recommendations of Rate and Series).