Item No NVK-5909 Description The Novak Sintered 13mm Tuning Rotor was designed to alter the feel and experience of driving a Novak motor, and offers a new dimension of tunability. With a slightly larger diameter and improved magnetic material, the rotor can withstand a higher temperature threshold, improving its durability. It also increases the natural drag brake and opens up the motor's gearing window to improve drivability. The Sintered 13mm Tuning Rotor is compatible with the Novak Ballistic-series, SS Pro-series and other Novak 540-size brushless motors that have an oversized front bearing. The rotor is also ideal for Touring Car, Oval, 1/12th-scale or other high-traction applications. Specifications Diameter: 13.0 mm Weight: 31.0 g (1.09 oz) Magnet: Nickel-plated, high-strength Sintered Neodymimum Maximum Operating Temperature: 200 deg C (392 degrees F)* Shaft Diameter: 1/8" [accepts all existing pinion gears] Nickel-Plated for stronger surface and resistance to corrosion Identifiable groove on the shaft bevel to differentiate it from other Novak rotors.