Our F1 RACING Spec. new flywheel is engineered and manufactured to industry specifications using premium grade iron, new ring gears, and new dowel pins. To reduce vibration and maximize performance, each unit is dynamically balanced, backed by our comprehensive warranty, and priced competitively versus the cost of a resurfaced flywheel. Warranty costs and idle rack time are virtually eliminated. All F1 RACING Spec. flywheels comes with industry's best 12 months or 12,000 mile manufacturer defect warranty.