Renthal – Rear Sprockets - ATV, including grooved rear sprockets for the YFZ 350 Banshee, YFM 660 and YFM 350 Raptor, YFM 350X Warrior, Blaster, Honda TRX 250R, TRX 300EX and TRX 450R, rear sprocket choice is how quad racers fine-tune drive without touching the engine, and this group is built around sport ATV platforms. Sizes run from 38 to 48 tooth in 520 pitch, covering the 89-06 Yamaha YFZ 350 Banshee and YFM 660 Raptor, the 88-13 Blaster, YFM 350 Raptor and YFM 350X Warrior, and the 88-13 Honda TRX 250R, TRX 300EX, TRX 300X and TRX 450R, with hard anodized and silver grooved finishes available. The grooved design cuts weight where it counts, at the outer edge of a rotating part, and lets sand and mud clear so the chain stays properly seated. Adding teeth at the rear shortens final drive for hard launches, dune climbs and tight TT corners, while dropping teeth lengthens gearing for open desert and long straights where top speed matters. Precise machining keeps chain tension even through suspension travel, reducing slap and protecting the carrier. Quad gearing is a race-day tuning tool, not a one-time decision.