Ant/Beetle Drive Belts

S3M Timing Belts

S3M timing belts are a lightweight, compact, and reliable option for power transmission in Antweight and Beetleweight combat robots. They're especially useful for 4WD drivetrains, weapon drives, and other applications where you need positive engagement without the weight and complexity of gears or chains.

We stock a variety of S3M belt lengths from several suppliers so you can find the size that works best for your build.

Belt Sources

FT — FingerTech Robotics
FingerTech was one of the first combat robotics suppliers to offer S3M belts and remains our go-to option. Their belts are extremely flexible, durable, and well suited to compact drivetrain layouts.

RR — Repeat Robotics
Repeat Robotics belts are another combat-tested option for Antweight and Beetleweight builds. They pair well with the growing range of S3M pulleys and drivetrain components used throughout small combat robotics.

OCR — Organized Chaos Robotics
We added our own belt sizes to fill gaps that weren't readily available from other combat robotics suppliers. These belts are sourced directly from the factory and use Kevlar reinforcement for durability while remaining nearly as flexible as the FingerTech belts.

Whether you're building a compact 4WD drivetrain, driving a weapon, or just trying to squeeze a belt into an awkward robot layout, the expanded range of available lengths makes it easier to design around the belt you actually need.