Kyosho PNGS0821 - Steel Pinion Gear (21T/0.8M/?5.0)  [KY-PNGS0821]

Steel pinion for Inferno MP Series

The Kyosho PNGS0821 is a steel pinion gear supplied as a direct replacement part, specified in the product name as 21T/0.8M/?5.0 and intended for use with Inferno MP Series components such as the MP11e. This is an RC-scale accessory manufactured for drivetrain tasks, not for full-size vehicle use.

Designed as a straightforward steel replacement, the part focuses on wear resistance under normal RC operation and on providing predictable tooth engagement for consistent gear meshing. The 21-tooth count and 0.8 module rating match certain motor pinion standards used in Kyosho MP-series setups; the "?5.0" marking in the product name should be treated as supplied information.

Installation notes: confirm pinion bore and set-screw alignment before finalizing mesh, check motor shaft fit and secure the pinion with the correct hex screw torque, and verify clearance with the spur gear to avoid premature wear. When tuning gear ratios, changing the pinion tooth count will directly affect acceleration and top speed characteristics of an RC model, so pair this pinion with the appropriate spur gear and test with conservative settings first.