This Kyosho spur gear is a factory replacement part for the Ultima RB7.5, featuring a 69-tooth count at 48 pitch. The 48p tooth profile is a standard RC pitch, making mesh compatibility with existing pinion gears straightforward. This plastic spur gear mounts to the center differential or transmission of the RB7.5 drivetrain and is a direct fit for that platform. Features: 69-tooth count 48 pitch Designed for the Kyosho Ultima RB7.5 7/7/26 cs