i lost one of the bearings. what size are they?

Bearing wheel size: Wheel Diameter: 37 mm / 1.46 inch Height: 17 mm / 0.67 inch (between two wheels, copper pillar length) Stainless Steel Connector: 42 mm / 1.65 inch

Is there are wiring diagram to connect motors with Dfrobot development board?

Dear customer, pls check out the video below for information, hope this helps.

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Professional TS300 Shock Absorption Robot Tank Chassis with Suspension Supporting Holder for Arduino Raspberry Pie, RC Tracked Model with 2pcs DC Encoder Motor for Monitor STEAM Teaching

Professional TS300 Shock Absorption Robot Tank Chassis with Suspension Supporting Holder for Arduino Raspberry Pie, RC Tracked Model with 2pcs DC Encoder Motor for Monitor STEAM Teaching

Product ID: 397533011

🔧Adjustable metal chassis with bearings

⚙️High torque dual DC motors

🛡️Independent shock absorption system

Description

🤖 Dominate your robotics game with the TS300 – where power meets precision and creativity!

CUSTOMIZABLE BUILD - Modular aluminum alloy chassis with adjustable track length and bearing-equipped wheels for reduced friction and enhanced durability.
OBSTACLE CONQUEROR - Advanced shock absorption suspension system ensures smooth navigation over rough terrain and crushed stones.
PRECISION POWERHOUSE - Dual high-torque encoder DC motors deliver responsive speed feedback for seamless Arduino & Raspberry Pi integration.
STEAM READY INNOVATION - Perfect for educators and makers—ideal for robotics competitions, VR/AR projects, and hands-on STEM learning.
PLUG PLAY FLEXIBILITY - Supports remote control via WiFi, PS2, or Bluetooth with open-source Arduino code to jumpstart your DIY robotic tank.

The Professional TS300 Shock Absorption Robot Tank Chassis is a robust, aluminum alloy DIY platform featuring dual high-torque encoder DC motors and an independent suspension system. Designed for Arduino, Raspberry Pi, and other microcontrollers, it offers adjustable track length and bearing wheels for smooth, durable operation. Ideal for STEAM education, robotics competitions, and VR/AR applications, this kit empowers makers and students to build customizable, remote-controlled tracked robots with comprehensive open-source support.

Specifications

Additional Features	Remote Control
Age Range Description	Kid
Animal Theme	robot
Are Batteries Required	No
Asin	B09KLRJ9XY
Brand Name	Swaytail
Collection Name	All
Color	Raspberry
Customer Reviews	4.0 4.0 out of 5 stars (13) 4.0 out of 5 stars
Educational Objective	STEM
Is Assembly Required	Yes
Item Dimensions	26.9 x 25.8 x 11.1 centimeters
Item Dimensions L X W X H	26.9L x 25.8W x 11.1H centimeters
Manufacturer	szdoit
Manufacturer Minimum Age Months	16.00
Manufacturer Part Number	ts300
Material Type	Plastic Metal aluminum alloy
Model Number	ts300
Number Of Pieces	1, 2
Operation Mode	Manual
Outer Material	Aluminum
Play Activity Location	Floor
Power Source	DC power supply
Recommended Uses For Product	STEAM education, robot learning, DIY creations, VR/AR applications, video monitoring, competitions, graduation design, engineering prototypes
Set Name	1 Set
Size	10.6 x 10.16 x 4.37 inch
Style	Modern
Sub Brand	TS300
Supported Battery Types	No batteries required
Theme	Robot
Upc	724164029201

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