Pololu 3690 / 3691 Multi-Hub Wheel with Inserts for 3mm and 4mm Shafts - 80×10mm - 2-Pack

The Pololu 3690 / 3691 Multi-Hub Wheel is a versatile 80mm diameter wheel with 10mm width designed for robotics and mobile platform applications requiring dual shaft compatibility. Professional roboticists, autonomous vehicle developers, and educational institutions use these wheels to build adaptable drivetrain systems that accommodate both 3mm and 4mm motor shafts without requiring separate wheel inventory. This product solves the critical engineering challenge of maintaining design flexibility while reducing mechanical complexity and cost in multi-motor robotic platforms.

Product Overview

The Pololu Multi-Hub Wheel represents an intelligent engineering solution for applications requiring shaft versatility. The wheel features a robust polymer construction with an 80mm outer diameter and 10mm width profile, optimized for traction and stability on various surfaces. The dual-insert hub system allows seamless integration with both 3mm and 4mm shaft diameters through interchangeable inserts, eliminating the need to stock multiple wheel variants. This modular approach significantly reduces component inventory while maintaining consistent performance characteristics across different motor configurations.

The wheel's design incorporates a textured tread pattern that provides reliable grip on smooth laboratory surfaces, tile floors, and outdoor terrain. The 2-pack configuration offers cost-effective procurement for dual-motor or four-wheel drive platforms. The inserts are precision-engineered to create a secure, zero-backlash connection with standard motor shafts, critical for applications requiring accurate odometry and synchronized motor control. The lightweight construction minimizes rotational inertia, making these wheels ideal for rapid acceleration and deceleration scenarios in autonomous navigation systems.

Key Specifications

Specification	Details
Product Type	Multi-Hub Robot Wheel with Interchangeable Inserts
Brand	Pololu Robotics and Electronics
Origin	Original / Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp
Wheel Diameter	80mm
Wheel Width	10mm
Compatible Shaft Sizes	3mm and 4mm diameter shafts
Material	Durable polymer with textured tread
Quantity per Pack	2 wheels
Hub Insert Type	Interchangeable inserts for 3mm and 4mm shafts

Key Features

• Dual-shaft compatibility with 3mm and 4mm inserts eliminates the need for multiple wheel variants in mixed-motor platforms, reducing inventory complexity and procurement costs
• 80mm diameter provides optimal balance between torque requirements and linear velocity for small to medium-sized mobile robots operating at 12V to 24V power levels
• Textured polymer tread pattern delivers consistent friction coefficient across diverse floor surfaces, ensuring predictable odometry calculations and reliable traction in navigation algorithms
• Zero-backlash insert design maintains precise shaft engagement, critical for synchronized dual-motor control and accurate dead-reckoning in autonomous systems
• Lightweight construction minimizes rotational inertia, enabling rapid acceleration profiles and reducing power consumption during start-stop motion sequences
• 2-pack configuration provides matched pair wheels for symmetrical drive characteristics in differential-drive robot architectures

Applications and Use Cases

• Educational robotics platforms and STEM competitions where mixed motor inventory requires flexible wheel compatibility without mechanical redesign or custom fabrication
• Autonomous mobile robots and wheeled AGVs requiring modular drivetrain architecture that accommodates vendor-specific motor shaft specifications across multiple platforms
• Research prototyping environments where rapid iteration demands quick motor substitution without complete mechanical redesign of wheel assemblies
• Multi-configuration robotic systems designed for different payload capacities or speed profiles, where shaft size variation reflects motor selection optimization

How to Use

Installation begins by identifying your motor shaft diameter (3mm or 4mm) and selecting the corresponding insert from the provided set. Align the insert with the wheel hub and press firmly until fully seated, ensuring the insert's drive feature engages completely with the hub's retention mechanism. Insert your motor shaft into the hub opening and secure using the provided set screw or fastening method appropriate to your motor design. Verify that the wheel rotates freely without wobbling, indicating proper insert seating and shaft alignment.

Mount the wheel assembly onto your robot platform using appropriate brackets or motor couplers, ensuring the wheel axis is perpendicular to your desired direction of travel. For differential-drive configurations, install wheels on both sides of your platform with matching insert sizes to maintain symmetrical drive characteristics. Before operational deployment, rotate each wheel manually to confirm smooth operation and verify that the tread pattern makes consistent contact with your working surface. If using these wheels with encoders or odometry sensors, calibrate your distance-per-revolution constants empirically on your actual operating surface, as tread compression varies with load and surface properties.

Frequently Asked Questions

Can I switch between 3mm and 4mm inserts on the same wheel?

Yes, the Pololu 3690 / 3691 wheels are specifically designed with interchangeable inserts. You can remove the current insert by gently prying it out with a small tool and replace it with the alternative size. This flexibility allows you to adapt a single wheel set to different motor configurations without purchasing additional wheels. However, ensure the insert is fully seated before operation to maintain zero-backlash engagement.

What is the maximum recommended load and speed for these wheels?

These 80mm wheels are optimized for small to medium mobile robots typically weighing 2-10 kg with motor speeds in the 100-300 RPM range, translating to linear velocities of approximately 0.5-1.5 m/s. Maximum load capacity depends on your motor torque rating and platform weight distribution. For heavier platforms or higher speeds, consider Pololu's larger wheel options. Always verify that your motor's torque output can overcome rolling resistance and acceleration requirements for your specific application.

How do I ensure accurate odometry with these wheels?

Accurate odometry requires empirical calibration of your distance-per-revolution constant on your actual operating surface. Measure a known distance (minimum 2 meters), drive your robot straight, and count encoder pulses to establish your platform's actual meters-per-revolution value. Surface properties significantly affect tread compression and effective wheel diameter, so calibrate on representative surfaces. Use differential-drive odometry corrections if wheel diameters vary slightly between left and right wheels due to manufacturing tolerances or tread wear.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication
• Expert Team: Our technical team validates every product before listing
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
• Payment Options: COD, UPI, credit/debit cards, net banking, EMI available
• Technical Support: 24/7 expert guidance via email and WhatsApp
• Returns: 7-day return policy on manufacturing defects only

Buy Pololu 3690 / 3691 Multi-Hub Wheel with Inserts for 3mm and 4mm Shafts - 80×10mm - 2-Pack Online in India

Purchase the Pololu 3690 / 3691 Multi-Hub Wheel with Inserts for 3mm and 4mm Shafts - 80×10mm - 2-Pack online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on Pololu 3690 / 3691 Multi-Hub Wheel with Inserts for 3mm and 4mm Shafts - 80×10mm - 2-Pack with fast shipping and expert support.

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