Key Features:

✔ Wheel Specs:

• Diameter: 130mm (5.1 inches)

• Material: Durable rubber tread with plastic hub

• Width: 30mm (1.2 inches)

• Shaft Hole: 4mm (fits common DC gear motors)

✔ Coupler Specs:

• Shaft Size: 4mm to 4mm (metal grub screw design)

• Material: Aluminum alloy (lightweight, rust-proof)

• Length: 20mm

✔ Load Capacity: Up to 5kg per wheel (for light to medium-duty bots)

Applications:

• Robot Cars & AGVs – Line followers, obstacle-avoidance robots

• DIY Mobility Projects – Motorized trolleys, conveyor prototypes

• Educational Kits – STEM/STEAM robotics learning

• Camera Dolly Wheels – Smooth rolling for filming rigs

How to Use:

1. Attach the coupler to a 4mm motor shaft (e.g., TT motor, N20 gearmotor).

2. Secure the wheel onto the coupler using the grub screws.

3. Repeat for the second wheel to create a balanced drive system.

Package Includes:

• 2× 130mm Rubber Wheels (4mm bore)

• 1× 4mm Metal Shaft Coupler

• Grub Screws 

Why Choose This Combo?

✅ Ready-to-Roll – No need to buy wheels/couplers separately.
✅ Stable Grip – Rubber tread prevents slipping on smooth surfaces.
✅ Wide Compatibility – Works with most 4mm shaft motors (check motor specs).