Every K’NEX / Knex item is hand‑sorted, inspected, and pre‑packaged for quality assurance.
All parts are authentic OEM K’NEX — never off‑brand, never 3D‑printed.
Never bulk pulled — no dusty bins, no mixed lots, no surprises.
Professionally packaged for builders, educators, and collectors.
Ideal for classroom STEM projects, makerspaces, robotics clubs, and homeschool programs.
MNWebSource maintains one of the most complete OEM vintage K’NEX catalogs available — rods, connectors, micro parts, motors, tubing, gears, tires, clips, chains, panels, coaster cars, balls, robots, and more.
Trusted by STEM educators, roller coaster enthusiasts, and master builders worldwide.
Description
Large Green Dual‑Tooth Chainring Gear — one of the rarest OEM K’NEX gears ever produced.
Features two independent rings of teeth (inner + outer), similar to a bicycle chainring.
Designed for compound gearing, torque transfer, mechanical drivetrains, and advanced engineering builds.
Compatible with standard K’NEX axles, gears, and drivetrain components.
These gears appear only in limited‑run robotics and mechanical sets, making them highly sought after by collectors and master builders.
USED OEM — hand‑sorted to ensure no cracks, no warped teeth, and no stress damage. Light cosmetic wear may be present from normal use.
Shipping
Ships same‑day or within 18 hours from our Midwest hub.
Professional packaging: polybags, thank‑you cards, and occasional stickers for large orders.
Fast coast‑to‑coast and tracked international delivery.
Returns
60‑day returns accepted.
Items must be returned complete and in original condition.
Feedback
We strive for 5‑star feedback and respond to messages quickly.
Positive feedback left for every buyer.
About Us
Born and raised Minnesotans, we operate MNWebSource as a family‑owned business committed to consistent OEM quality and long‑term support for the builder community.
We maintain one of the most complete OEM vintage K’NEX catalogs available — rods, connectors, micro parts, motors, tubing, gears, tires, clips, chains, panels, coaster cars, balls, robots, and more.
Every piece is hand‑sorted, cleaned, brittle‑checked, and professionally packaged.
Supporting educators, STEM programs, robotics clubs, makerspaces, homeschool builders, science museums, and master builders with reliable OEM parts.
More than half of our buyers are repeat customers — a community of builders, educators, and collectors who return because they trust our consistent OEM quality.
We ship worldwide and proudly support the global builder community.
Repeat buyers include roller coaster builders and ball machine creators.
We are not affiliated with K’NEX; all names and marks are registered trademarks of K’NEX.