Renthal – Rear Sprockets - Kawasaki Dirt Bike - 520 Pitch, including grooved rear sprockets in silver, green and black, hard anodized LTD Edition gearing, and 49 and 50 tooth options, gearing is where a Kawasaki dirt bike is matched to the track, and this shelf covers the full-size green machines in 520 pitch. Fitments run across the 94-23 KX 125, KX 250, KX 250F, KX 450, KX 450F, KX 450X and the KLX 250, KLX 300R and KLX 450F, plus the 92-05 KX 250 two-stroke and KLX 650R, in 49 and 50 tooth. Grooved cutouts strip weight from the outer diameter of the sprocket, cutting rotating inertia so the bike accelerates more freely and changes direction with less effort, and they give mud, sand and roost a path out of the tooth root. A 50 tooth rear shortens final drive for rutted, technical motocross and steep enduro climbs, while a 49 tooth calms delivery for sand and wide-open tracks. Precise pitch keeps the chain seated, quiet and evenly worn, protecting the front sprocket and slider. Renthal proves this hardware at the highest level of racing. Green bike owners often keep both counts and choose by track conditions.