Renthal – Rear Sprockets - Kawasaki ATV - 520 Pitch, including silver grooved 520 pitch rear sprockets in 36 and 38 tooth for the 08-14 Kawasaki KFX 450R, a sport quad's rear gearing sets the balance between drive off the corner and speed down the straight, and these two options bracket that decision for one machine. Both are 520 pitch silver grooved rear sprockets built for the 08-14 KFX 450R, offered in 36 and 38 tooth. The 38 tooth shortens final drive so the quad launches harder, climbs dunes with less clutch slip and pulls stronger out of tight TT and MX corners. Grooved cutouts remove mass from the outer edge of the sprocket, which reduces rotating inertia and helps the engine spin up more freely, and they open a path for sand and mud to escape rather than packing between chain roller and tooth. Because a quad loads its driveline constantly through ruts and jump faces, accurate tooth pitch keeps chain tension steady, reduces slap on the slider and protects the rear carrier and bearings. Renthal quality keeps that gearing feel consistent all season. Two tooth counts cover almost every way a KFX 450R gets ridden.