Chariot vs Servo Mount Bucket: Which littleBits Add-On?
By Sphero Coding Robots & Kits | PK-12 STEM Education, AI | Published: 2026-10-26
Category: Comparisons
The Sphero Chariot turns BOLT robots into cargo carriers; the littleBits Servo Mount Bucket secures a servo motor to a mounting board. Here's how to pick.
Quick Answer
Choose the Sphero Chariot if you want to turn a BOLT or BOLT+ robot into a cargo carrier, messenger, or racing vehicle. Choose the littleBits Servo Mount Bucket if you already own a littleBits servo motor and a mounting board and need to attach the two securely. They solve different problems, so the right pick depends on which platform your build is already using.
Why These Two Add-Ons Aren't Interchangeable
The Chariot and the Servo Mount Bucket both fall under the littleBits movement add-ons umbrella in casual conversation, but they attach to different hardware and enable different kinds of motion. The Chariot is a Sphero accessory: it gives a BOLT or BOLT+ robot a physical role as a vehicle, carrying cargo or racing against other chariots. The Servo Mount Bucket is a littleBits accessory: it holds a littleBits servo motor onto a littleBits mounting board so the servo can drive rotating motion inside a Bits build.
That distinction matters because buying the wrong one leaves you with an accessory that won't connect to anything you own. If your classroom runs Sphero BOLT robots, the Chariot is the add-on that extends what those robots can do. If your classroom runs littleBits circuits, the Servo Mount Bucket is the piece that makes servo-driven projects stable enough to survive student handling.
The Trade-Off: Robot Vehicle vs Circuit Hardware
The Chariot's trade-off is that it only works with Sphero BOLT and BOLT+ robots. It adds cargo-carrying, note-delivery, building-block, and racing play to those robots, but it does nothing for a littleBits circuit. The Servo Mount Bucket's trade-off is narrower still: it only helps if you already have a littleBits servo motor and a mounting board. Without those two components, the bucket has nothing to hold.
Cost reflects that difference in scope. The Servo Mount Bucket is a small, low-cost accessory at USD 3.40, while the Chariot is a larger add-on at USD 18.00. Neither price tells you which is better; it tells you the Chariot is a self-contained play extension and the Servo Mount Bucket is a supporting part in a larger system.
How to Decide Between the Chariot and the Servo Mount Bucket
- If your build starts with a Sphero BOLT or BOLT+: Pick the Chariot. It snaps onto those robots and adds cargo, messaging, block-building, and racing options that the robot can't do on its own.
- If your build starts with a littleBits servo motor: Pick the Servo Mount Bucket. It attaches that servo to a littleBits mounting board so rotating motion stays stable during a project. You need both the servo motor and the mounting board for this accessory to be useful.
- If you're buying for a mixed classroom: Buy the Chariot first if Sphero robots are your primary platform, and add the Servo Mount Bucket only when you're running littleBits servo projects. Buying both at once only makes sense if you teach on both platforms.
Product Facts at a Glance
- littleBits Servo Mount Bucket: The littleBits Servo Mount Bucket is compatible with littleBits servo motors and littleBits mounting boards. It only adds value if your kit already includes both of those components, so check your inventory before buying.
littleBits Servo Mount Bucket - Chariot: The Sphero Chariot lets you carry cargo, send notes with a messenger robot, snap on building blocks, or race friends. It turns a BOLT or BOLT+ robot into a vehicle for open-ended play and design challenges rather than a fixed-function accessory.
Chariot
Who Each Add-On Fits
Best for
- Sphero BOLT or BOLT+ owners who want vehicle-based play and design challenges
- Teachers running delivery, cargo, or racing activities with Sphero robots
- Families looking for a single add-on that expands what an existing robot can do
Not for
- littleBits circuits that don't include a Sphero BOLT or BOLT+ robot
- Builders who need servo mounting hardware but don't own a littleBits servo motor or mounting board
- Anyone expecting one accessory to work across both Sphero and littleBits platforms
