This gear is designed for a high power Nissan GTR for max top speed. The gear ratio, based on calculation with a stock tire size, would achieve 249mph (400km/h) in the 6th gear at around 8,000 rpm.
This gear was used for the Power House AMUSAE GTR Phantom for its top speed run sponsored by Option magazine. The Phantom recorded 373.4km/h.
A set of two ring gears and pinion gears - One for the front, and the other for the rear.