9C MONTY 4WS MOA 1/10 SCALE COMPETITION CRAWLER

9C Monty — Competition Crawler

A compact competition crawler built for challenging rock terrain. Lightweight, portable, and designed for precise control on technical lines.

Key Features

• Steering: 60°+ front and rear steering

• Drivetrain: MOA (Motor on Axle) with 4WS

• Portal Axles: High-reduction gearing for increased wheel torque and ground clearance

• Chassis: Carbon fiber

• Shocks: 85 mm high-performance shocks

• Motor Compatibility: 380 / 36 mm motors, including compatible 2-in-1 systems

• Build Type: Slider — electronics and wheels sold separately

Recommended Electronics & Accessories

Monty comes as a rolling chassis with the chassis, axles, shocks, electronics mounts, and hardware. The following components are not included, allowing you to choose your preferred setup or reuse existing equipment.

• Radio transmitter and receiver

• Two drive units — one for each axle

• Two steering servos and servo horns

• Four wheels and tires

1. Radio System (TX/RX)

Monty requires a radio system with at least four independent channels and suitable mixing functions.

Requirements

• Minimum 4 channels with an independent receiver output for each channel.

• The transmitter must support channel mixing to adjust front and rear throttle.

• Compatible options include the Sanwa/Airtronics MT-4 with MOA mixing or an EdgeTX radio such as the RadioMaster Pocket.

• Rear steering can operate independently or be mixed with front steering, depending on the radio setup.

2. Motors & ESCs

Monty uses independent front and rear drive units. You need two complete drive units: two motors and two ESCs, or two compatible 2-in-1 units.

All pinions must use the 48DP gear standard.

Important

• The Hobbywing Mini16 requires a 3D-printed adapter and a special Axial Capra UTB18-style 13T pinion. The adapter STL is available from 9C RC.

• Confirm pinion compatibility before ordering.

• After installation, rotate the drivetrain by hand to ensure the gears move freely.

• A motor guard is recommended to protect exposed motors from rocks and debris. A free 3D-printable front skid plate is also available from 9C RC.

3. Steering Servos & Servo Horns

Monty requires two low-profile steering servos, one for each axle.

Recommended minimum torque: approximately 40 kg·cm.

Compatible examples:

• JX B40

• Reefs 800LP

• AGFRC A66FHLW

• NSDRC RS650 High Torque Low Profile (46–80 kg·cm, depending on voltage)

Use a 25 mm servo horn for the recommended steering range.

Servo Power Options

• Split BEC: use the front ESC's BEC for the front servo and the rear ESC's BEC for the rear servo.

• External BEC: use a single BEC rated at least 10A.

• Direct power: connect a compatible servo directly to the battery power rail, following its voltage requirements. The NSDRC RS700 V2 is one example.

Safety: Do not connect both ESCs' positive BEC wires to the receiver at the same time. This can cause electrical conflicts and damage components.

4. Battery & Power Harness

Recommended battery: GNB 380mAh 3S LiPo
Dimensions: 20 × 17 × 55 mm
Weight: Approximately 32 g

Monty uses one battery to power both drive units. A Y-harness is required to connect the battery to both ESCs.

Recommended connector: XT30.

You can use a ready-made XT30 Y-harness or build one yourself. Ensure correct polarity and insulate all connections properly.

5. Wheels & Tires

Monty supports 1.9-inch and 2.2-inch wheels using the VP 6-screw bolt pattern.

Wheel Recommendations

• High-clearance competition-style wheels

• Narrow-offset rims suited to the chassis width

• Dlux 1.9-inch or 2.2-inch wheels, along with other compatible VP-pattern wheels

Setup Tip: Heavier front wheels and lighter rear wheels can help improve front traction when climbing.

Compatible Tire Range: 4.19–4.75 inches in diameter.

Key Technologies

60°+ Steering
Wide steering angles at both ends help Monty navigate tight spaces and technical rock sections.

Double-Joint CV Driveshafts
Designed to maintain smooth power delivery at extreme steering angles.

Integrated Servo Mounts
Rigid servo mounting helps provide precise steering control.

Optimized Portal Reduction
Designed to improve ground clearance and wheel torque for technical crawling.

Portable Design
Compact and lightweight construction makes Monty easier to carry to remote crawling locations.

Complete Build Checklist

Before running Monty, make sure you have:

• One compatible 4-channel-or-higher radio system

• Two compatible motor and ESC drive units

• Two compatible 48DP pinions

• Two low-profile steering servos

• Two 25 mm servo horns

• A suitable BEC and power setup

• One compatible 3S battery

• One Y-harness

• Four compatible wheels and tires

Note: Monty is sold as a slider, not a ready-to-run vehicle. Electronics, wheels, and tires must be purchased separately. Always verify component compatibility and voltage requirements before assembly.

Straps on.Walks in.

The best rock never sits next to a car park. Monty is built to travel on your back — over the pass, down the scree, into the line nobody else bothers to reach.

Take it anywhere. Crawl everything.