Koswork Mod 1 M1 15T Aluminium Lightweight Pinion Gear for 5mm Shaft - KOS03009-15

The Koswork KOS03009-15 is a Mod 1 (M1) 15-tooth aluminum pinion gear designed for RC car drivetrains using a 5mm motor shaft. Built from lightweight aluminum, this pinion gear is aimed at competition and performance-focused RC drivers who want to reduce rotational mass without sacrificing durability. The 15T tooth count suits applications where a lower gear ratio is needed, and the included high-torque set screw ensures a secure, slip-free fit on the motor shaft.

Key Features

• Mod 1 (M1) tooth pitch — compatible with any M1 spur gear setup
• 15-tooth count for lower gear ratio applications, suited to high-torque or technical track layouts
• Aluminum construction reduces rotational weight compared to steel pinions
• Precision-machined for a 5mm motor shaft bore
• High-torque set screw included for a firm, reliable shaft lock

Compatible With

• Any 1/8 or 1/10 scale RC car using a Mod 1 spur gear and a motor with a 5mm shaft
• Brushless and brushed motors with 5mm output shafts
• Most competition-grade on-road, off-road, and buggy platforms running M1 gearing

What's Included

• 1x Koswork KOS03009-15 Mod 1 15T aluminum pinion gear (5mm shaft bore)
• 1x High-torque set screw