Track Material and Tensioning

This is the part that fails first, and almost nobody checks it before buying. Moulded rubber tracks grip best and are quietest, but stretch with heat and use. Linked plastic treads are cheap and repairable one link at a time, but they rattle and shed links on sharp turns. What matters more than material is whether the chassis gives you a tensioning adjustment, usually a slotted idler mount you can slide. A platform with no way to re-tension a stretched track is a platform that will start throwing tracks and never stop.

Motor Torque and Encoders

Skid steering means both tracks scrub sideways through every turn, so a tank needs meaningfully more torque than a wheeled robot of the same mass. Look at the gear ratio rather than the RPM figure: a 1:48 or slower geared motor will climb, a fast unreduced motor will just spin the tracks. If you intend to write any kind of closed loop control, buy the encoder motor variant from the start. Retrofitting encoders to a tracked chassis is far more painful than paying for them up front, and without them your odometry is guesswork.

Power Budget and Battery

Tracks are hungry. Stall currents on a loaded tracked platform are high enough that a shared 5 V rail will brown out a Raspberry Pi mid turn, which shows up as random reboots people blame on software. Check whether the kit gives the controller a regulated supply separate from the motor rail, what battery it ships with, and whether you can charge without stripping the robot. Kits that include 18650 cells with USB-C charging save you a genuinely annoying accessory hunt.

Camera, Gimbal and Arm

A tank is a natural inspection and manipulation platform, so the payload on top decides what the project actually becomes. A two axis camera gimbal turns an FPV toy into a target tracking exercise, because a fixed camera makes visual servoing nearly pointless. A 4-DOF arm turns the same chassis into a pick and place problem with real inverse kinematics. Check how the camera is mounted too: several kits rivet the module in place, which means a dead camera is not user replaceable.

Documentation and Open Code

Once the mechanics are bolted together, software support is the entire experience. The vendors worth buying from publish versioned online documentation and a public GitHub repository you can read, fork and fix. The ones worth avoiding ship a download link on the box and a zip that assumes a three year old OS release. Before you buy, open the vendor’s docs site and repo, check the last commit date, and see whether the install steps name a specific Raspberry Pi OS or Arduino IDE version.

The Keyestudio Mini Tank is the cheapest complete tank robot here and the sensible answer to “I want tracks but I have never built a robot”. It is small, it is Arduino compatible, and Keyestudio structures the learning as 15 online projects that start at blinking an LED and end with the robot fully assembled and driving, which is a much better teaching pattern than handing someone a finished sketch. It gives you four control modes, IR remote, a phone app over an HM-10 Bluetooth module, ultrasonic obstacle avoidance and following, and light following, and the 8×16 LED dot matrix panel on the front is a nice touch because it gives beginners a visible state display for their code. Electrically it is modest and honest: a DRV8833 motor driver, 5 V 200 RPM motors, a 6 to 9 V input, ultrasonic ranging from roughly 2 cm to 3 m, about 10 m of IR range and around 30 m of Bluetooth range. The programming path runs from Mixly graphical blocks into the Arduino IDE. What you are not getting is climbing ability, because this is a small plastic tracked platform with light motors rather than the sprung steel of the Conqueror.

This is the only platform in the guide that arrives ready to do real SLAM, and it is priced accordingly. XiaoR Geek builds it around a Raspberry Pi 4B with 4 GB, and unusually for this category the board, TF card and battery pack are all in the box, which changes the price comparison considerably once you account for what the other Pi kits leave out. The sensing is what you are paying for: an XR-Lidar S1 for scanning and ranging, an HD camera and a 3.5 inch touch display mounted on the deck so you can drive the robot without SSH. On top of ROS it ships mapping, fixed point and multi point navigation, autonomous driving, obstacle avoidance, object tracking and camera patrol, programmable in Python and C. A tracked base is a sensible choice for a SLAM robot because it stays planted on the uneven floors where a small wheeled rover gets stuck, though you should expect track slip to make wheel odometry unreliable and to lean harder on the lidar and IMU. The caveats are the price, the small number of reviews, and documentation that is translated and occasionally rough.

The original RaspTank is the acrylic version of the kit above, and for a lot of people it is the smarter buy. You keep the thing that matters, the 4-DOF arm with a gripper on a tracked base, and you give up the anodised aluminium in exchange for laser cut acrylic and a lower price. It has by far the largest review history of any Raspberry Pi tank on Amazon, which is worth something in a category full of listings with single digit review counts. The functional set is close to the metal version: obstacle avoidance, infrared line tracking, OpenCV computer vision line tracking, target recognition, Wi-Fi remote control, real time video and RGB lighting, all in editable Python. The nicest practical detail is the power system, which charges 18650 cells over USB-C with overcharge protection and lets you operate the robot while it charges, so you are not unbolting the chassis to swap cells. Adeept quotes a 4 to 6 hour build for ages 16 and up, and includes over 300 pages of tutorials with more than 20 coding projects. Board support stops at the Pi 4B, so Pi 5 owners want the metal version instead.

If you are an embedded engineer rather than a kit builder, this is the one to buy. Hiwonder sells it as a bare platform, which means no controller, no driver board, no battery and no sensors, and that is exactly the point: you bring your own stack instead of unpicking someone else’s. The mechanics are the reason to pick it over the cheap chassis on Amazon. The body is anodised aluminium alloy, the running gear uses an eight channel high elasticity carbon steel tension spring suspension riding on micro bearings, and that combination is what lets a tracked robot stay planted and keep both tracks loaded over uneven ground instead of skipping. Crucially, the recommended variant ships encoder DC gear motors, so you can close the loop, implement PID speed control and attempt odometry rather than driving open loop PWM and hoping. The top deck lifts off for wiring, and the frame is drilled with expansion ports for the usual suspects, Arduino, Raspberry Pi and Jetson Nano. This is the platform for an ESP32 or STM32 motor control project, a ROS 2 hardware interface you write yourself, or an outdoor rover.

This is the simpler, cheaper sibling of the chassis above and the closest live replacement for the discontinued DFRobot Devastator. You get a full metal frame with a two layer deck, high torque DC gear motors running on anything from 6 to 12 V, and engineering plastic tracks chosen for elasticity and grip rather than looks. There is no suspension linkage and, on the base variant, no encoders, so this is an open loop platform: fine for teleoperation, an FPV rover, a sensor mule or a first tracked robot, and not the thing to pick if you want PID speed control. Where it earns its place is headroom. Running the motors at 12 V gives you noticeably more torque than any of the complete kits in this guide, and the plate is drilled for the usual controllers, so an ESP32-CAM rover, a Raspberry Pi inspection robot or a Jetson Nano vision platform all bolt straight on. It also sells in a couple of colours and motor options, including an encoder variant, so check which one the listing is actually selling.

Want one kit that just works?

The ELEGOO Conqueror gives you a sprung stainless steel tank, an UNO R3, an ESP32 FPV camera on a two axis gimbal and five working modes, with no soldering and instructions people actually praise.

Want the robot to pick things up?

The Adeept RaspTank Metal puts a 4-DOF aluminium arm and gripper on a tracked base with OpenCV vision, which is the shape of a real mobile manipulation project.

First robot ever, or a class set?

The Keyestudio Mini Tank is the cheapest complete kit here and teaches through 15 staged projects rather than one finished sketch, with Mixly blocks leading into the Arduino IDE.

Heading for ROS and SLAM?

The XiaoR Geek ROS SLAM Tank arrives with a lidar, an HD camera, a touch screen and a Raspberry Pi 4B already in the box, and does mapping and multi point navigation out of the box.

Want an arm on a budget?

The acrylic Adeept RaspTank keeps the 4-DOF arm and the OpenCV feature set for less money, and has the longest review history of any Raspberry Pi tank on Amazon.

Designing your own electronics?

The Hiwonder suspension tracked chassis gives you sprung aluminium running gear and encoder motors, which is everything you need for PID speed control and nothing you have to unpick first.

Just want cheap metal tracks?

The Hiwonder tank car chassis is the least expensive metal tracked base here, runs its motors up to 12 V, and takes an ESP32-CAM, a Pi or a Jetson Nano without modification.

Buying a bare chassis?

Add a controller, a motor driver rated for the stall current, a battery, a charger and any sensors to your budget before you compare it against a complete kit. That total is usually the honest comparison.

Are tracked robots actually better than wheeled robot cars?

Better at some things, worse at others. Tracks spread the robot’s weight over a long contact patch, so they climb carpet edges, thresholds, gravel and small steps that stop a four wheel chassis, and skid steering gives a true zero radius turn that is very useful indoors. The costs are real though: tracks scrub sideways through every turn, which means higher current draw, more wear and a much shorter battery life than a wheeled robot of the same weight. Tracks also slip by design, so wheel odometry is unreliable and you will lean on an IMU or lidar for pose. If your robot lives on smooth floors and you care about efficiency or dead reckoning accuracy, a wheeled chassis is the better engineering choice.

Should I buy a complete tank kit or a bare chassis?

It depends on which part of the project you actually want to do. A complete kit hands you working firmware, matched sensors and a curriculum, so you are learning software on hardware that already runs, and that is the right choice for a first robot, a classroom or anyone whose goal is the code. A bare chassis is right when the electronics are the project: your own board, your own motor driver, your own power design. Just be honest about the total. Once you add a controller, a driver rated for the stall current, a battery, a charger and sensors, a bare chassis build usually costs more than a complete kit, not less. You are paying for freedom, not savings.

Do I need encoder motors on a tank robot?

If you want closed loop control, yes, and you should buy them with the chassis rather than retrofitting later. Without encoders you are commanding PWM duty and hoping, which means the robot veers as the battery sags, drives at different speeds on carpet and tile, and cannot hold a straight line. Encoders let you run a PID speed loop per track, which fixes all of that and is the foundation for anything resembling odometry. Be aware of the limit though: because tracks slip during skid steering, encoder based odometry on a tank drifts far faster than on a wheeled robot, so treat it as a good velocity estimate rather than a reliable position estimate, and fuse it with an IMU or lidar if position matters.

Why does my tank robot keep throwing a track?

Almost always tension, and it usually shows up on hard turns because that is when the track is being pushed sideways hardest. Work through it in order: re-tension the track using the idler adjustment if the chassis has one, check that the sprocket and idler are parallel and that no screw has worked loose, look for a bent axle or a road wheel that no longer spins freely, and reduce how aggressively you counter rotate the tracks in your turning code. Very tight turns at full duty are the single most common cause. If a track has genuinely stretched past adjustment, replace it. Treat tracks as consumables and keep a spare set for any robot you drive regularly.

Arduino or Raspberry Pi for a tank robot?

Choose by what the tank has to do. An Arduino or ESP32 gives you a deterministic loop, instant boot, microsecond timing and low power, which is what you want for the motor control layer, PID speed loops and reading sensors. A Raspberry Pi gives you Linux, a camera stack, OpenCV, Python libraries, SSH while the robot is moving and enough compute for ROS or machine learning, at the cost of boot time and timing jitter. The honest test is one question: does the project need a camera or a heavy library? If yes, buy a Pi tank. If no, an Arduino tank teaches you more per dollar. Serious builds use both, with the Pi doing perception and a microcontroller running the motor loop, and a tracked chassis with encoder motors is the natural base for exactly that split.