ARRMA Kraton Outcast 8S 25T Mod1 Safe-D8 Pinion Gear ARA311045

The ARRMA Kraton Outcast 8S 25T Mod1 Safe-D8 pinion gear is a genuine steel replacement and tuning gear for compatible ARRMA large-scale vehicles, helping restore reliable drivetrain performance or adjust gearing for speed and torque balance.

This 25 tooth Mod1 pinion is designed for motors with an 8mm shaft and uses ARRMA’s Safe-D8 D-shaped bore to help maintain drive and braking if the set screw loosens. The gear is precision manufactured from tough steel and includes the required M4 set screw and E-clip for secure motor shaft retention.

Features

• Genuine ARRMA Pinion Gear: Factory replacement and tuning gear for compatible ARRMA vehicles
• 25 Tooth Gear Count: Useful for adjusting speed, acceleration and motor load on compatible setups
• Mod1 Gear Pitch: Matches compatible ARRMA Mod1 spur gear and drivetrain applications
• Safe-D8 Bore Design: D-shaped 8mm motor shaft bore helps retain drive and braking if the set screw backs out
• Strong Steel Construction: Built for durability in high-power RC bashing and speed applications
• Precision Wide Tooth Profile: Manufactured for smooth operation with compatible Mod1 gears
• Threaded Set Screw Hole: Allows secure installation using the included M4 x 4mm set screw
• E-Clip Retention: Supplied with a 5.6mm E-clip for motor shaft pinion retention

Specifications

• Brand: ARRMA
• Part Number: ARA311045
• Reference Number: 311045
• Product Type: Pinion gear
• Tooth Count: 25T
• Gear Pitch: Mod1
• Motor Shaft Size: 8mm
• Bore Type: Safe-D8 D-shaped bore
• Material: Steel
• Set Screw Size: M4 x 4mm
• E-Clip Size: 5.6mm
• Vehicle Compatibility: ARRMA vehicles where ARA311045 is listed in the manual
• Common Listed Applications: ARRMA Kraton 8S and Outcast 8S platforms where confirmed by the vehicle manual
• Intended Use: Replacement or tuning pinion gear for compatible large-scale ARRMA RC vehicles

Includes

• 1 x ARRMA 25T Mod1 Safe-D8 pinion gear for 8mm motor shaft
• 1 x M4 x 4mm set screw
• 1 x 5.6mm E-clip

FAQ

Does this pinion gear fit the ARRMA Kraton 8S? Yes. ARRMA ARA311045 is listed for compatible Kraton 8S vehicles where this part number appears in the manual.

Does this pinion gear fit the ARRMA Outcast 8S? Yes. This 25T Mod1 Safe-D8 pinion is listed for compatible Outcast 8S vehicles where ARA311045 appears in the manual.

What motor shaft size does this pinion fit? This pinion is designed for an 8mm motor shaft.

What does Safe-D8 mean? Safe-D8 refers to the D-shaped 8mm bore that matches compatible motor shafts, helping preserve drive and braking if the set screw loosens.

Will changing pinion size affect motor temperature? Yes. Larger or smaller pinions can change acceleration, top speed, runtime and motor temperature, so OZRC recommends monitoring temperatures after gearing changes.

Important Notes

• Check your ARRMA vehicle manual to confirm ARA311045 is the correct pinion gear before ordering.
• This pinion is for compatible 8mm motor shafts only.
• Use only with compatible Mod1 spur gears.
• Gear mesh must be set correctly during installation to prevent gear noise, heat and premature wear.
• Use suitable thread lock on the set screw when installing onto a metal motor shaft.
• Changing gearing can affect motor temperature, ESC temperature, runtime, acceleration and top speed.