The Pololu Romi Chassis Kit - Yellow is a versatile foundation for developing mobile robots. This comprehensive kit includes essential mechanical components such as two motors, two white wheels, a yellow ball caster, and battery contacts, all designed for seamless assembly. The Romi chassis features a differential-drive mobile robot platform with a 6.5-inch (165 mm) diameter and accommodates six AA batteries (not included) in its integrated holder. The drive wheels are strategically positioned on the circular base plate's diameter, enabling precise turns and in-place spinning, while a large, fixed ball caster at the rear ensures smooth movement. The chassis is equipped with 70×8mm Pololu wheels and Mini Plastic Gearmotors with extended backshafts, supporting the addition of quadrature encoders for position feedback. An abundance of general-purpose mounting holes and slots are available for attaching various electronics, such as microcontrollers, motor drivers, and sensors. The plastic components, available in six colors, offer customization options for replacement parts or unique color combinations.
1x Pololu Romi Chassis Kit - Yellow
1x Yellow Romi chassis base plate
2x Mini plastic gearmotor (120:1 HP with offset output and extended motor shaft)
1x Pair of yellow Romi chassis motor clips
1x Pair of white 70×8mm Pololu Wheels
1x Yellow Romi chassis ball caster kit
1x Romi chassis battery contact set
Diameter: 165 mm (6.5")
Differential-drive mobile robot platform
Integrated battery holder for six AA batteries
Drive wheels positioned on the circular base plate
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
A valid Return Authorization (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
The RA number is valid for 30 days. The returned item must be received within that period.
The RA number must be included with the return.
Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
Refunds are processed within 7 days after receipt and inspection of the returned item.
A $100 cleaning fee may apply to domestic robots returned in used or unclean condition.
A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
Consumables — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tires, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odor-absorbing products). Not eligible for return once unsealed.
Build-it-yourself products and items requiring customer assembly — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
Digital Goods, Software, and Apps — Final sale only, due to licensing restrictions.
Clearance Items — Products identified as clearance or final sale, including end-of-life or discontinued items.
Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
On-Demand Items — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfill a customer request.
While the same return policy applies, these orders require a separate contact process for returns.
RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".
