GPM Racing 7075 Alloy 21T Servo Saver for Arrma 1/16 Mini Kraton 3S Dsc 4x4 RTR Brushless Speed Truck (MAKM021TSH)

Aftermarket 21T servo saver for Mini Kraton and Grom

This aftermarket 21T servo saver is a scale RC steering component intended for ARRMA Mini Kraton and related small-scale Grom series models. Machined from 7075 aluminium, the part aims to add durability where stock plastic components are prone to wear.

The component incorporates a coil spring to absorb impacts and lessen shock transfer into the steering gear. The 21-tooth spline is compatible with servos and hubs built for that count, and the unit ships pre-assembled; apply a medium-strength threadlocker to metal screws where indicated to keep fasteners secure during operation.

Compatible Models

• ARRMA 1/16 Mini Kraton 3S DSC 4X4 RTR Brushless Speed Truck-ARA2508S
• ARRMA 1/16 Mini Kraton 3S DSC 4X4 RTR Brushless Speed Truck-ARA2508
• ARRMA 1/18 4WD Granite Grom Mega 380 Brushed 4X4 Monster Truck-ARA2102
• ARRMA 1/14 Typhon Grom Mega 380 Brushed 4X4 Small Scale Buggy RTR-ARA2106
• ARRMA 1/14 Typhon Grom 223S DSC 4X4 RTR Brushless Buggy-ARA2306
• ARRMA 1/14 Typhon Grom 223S DSC 4X4 RTR Brushless Buggy-ARA2306S
• ARRMA 1/16 Mojave Grom Mega 380 Brushed 4X4 Small Scale Desert Truck RTR-ARA2104
• ARRMA 1/16 Mojave Grom 223S DSC 4X4 RTR Brushless Desert Truck-ARA2304
• ARRMA 1/16 Mojave Grom 223S DSC 4X4 RTR Brushless Desert Truck-ARA2304S
• ARRMA 1/16 Quake Grom 4X4 RTR Brushed Monster Truck-ARA2137
• ARRMA 1/16 Gorgon Grom 4X4 RTR Brushed Monster Truck-ARA2130
• LOSI 1/12 Asphalt Late Model RC Race Car Dale Earnhardt Jr. No. 8-LOS-3104
• LOSI 1/12 NASCAR RC Race Car Kyle Busch No. 8 2024 Lucas Oil Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122408
• LOSI 1/12 NASCAR RC Racecar Chase Elliott No. 9 2024 NAPA Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122409
• LOSI 1/12 NASCAR RC Racecar Kyle Larson No. 5 2024 HendrickCars.com Chevrolet ZL1 Camaro 2S AWD RTR Brushed On-Road-LOS1122405
• LOSI 1/12 NASCAR RC Racecar Ryan Blaney No. 12 2024 Menards Ford Mustang 2S AWD RTR Brushed On-Road-LOS1122412
• LOSI 1/12 NASCAR RC Racecar RCR No. 3 GM Goodwrench Chevrolet ZL1 2S AWD RTR Brushed On-Road-LOSF1122503
• LOSI 1/12 NASCAR 2025 Kyle Larson No. 5 Valvoline-LOS1122505
• LOSI 1/12 NASCAR RC Racecar Dale Earnhardt Jr. No. 8 Budweiser Chevrolet ZL1 2S AWD RTR Brushed On-Road-LOSF1122508
• LOSI 1/12 NASCAR 2025 Ross Chastain No. 1 Busch Light-LOS1122501
• LOSI 1/12 NASCAR 2025 Chase Elliott No. 9 NAPA-LOS1122509
• LOSI 1/12 NASCAR 2025 Christopher Bell No. 20 DeWalt-LOS1122520
• LOSI 1/12 NASCAR 2025 William Byron No. 24 Raptor-LOS1122524
• LOSI 1/12 NASCAR 2025 Ryan Blaney No. 12 Advance Auto-LOS1122512
• LOSI 1/12 NASCAR 2025 Joey Logano No. 22 Shell-LOS1122522
• LOSI 1/12 NASCAR RC Race Car Martin Truex Jr. No. 19 2024 Bass Pro Toyota Camry 2S AWD RTR Brushed On-Road-LOS1122419
• LOSI 1/12 NASCAR RC Race Car Michael McDowell No. 34 2024 Horizon Hobby Ford Mustang 2S AWD RTR Brushed On-Road LOS1122434

What does 21T mean and why is it important?

The 21T label denotes the number of teeth on the spline. Matching the saver spline to your servo and steering hub spline is essential to ensure correct mechanical engagement and avoid stripping.

Are there any prep steps recommended before running?

Inspect the part for any machining burrs and ensure the spline seats cleanly on the servo. Use a medium-strength threadlocker on indicated metal screws to prevent loosening during operation.

How does this saver interact with the steering servo under load?

The integrated spring allows the saver to compress under sudden impact, reducing the shock transmitted to the servo gears and linkages. It is not a guarantee against damage but helps mitigate common impact forces. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.