iRobot Roomba Plus 415/515/575 Upgrades: A Look at the New Three-Prong Curved Side Brush

iRobot recently introduced the Roomba Plus 415, 515, and 575 Combo. Beyond upgrades to suction, navigation, and dock functions, the new generation also brings changes that matter to the replacement-parts market.

iRobot’s official listings confirm that several Roomba Plus 415/515/575 accessories are shared across all three models, including the filters, Edge-Sweeping Brushes, Multi-Surface Bristle Brush, and DualClean mop pads. Among them, the new three-prong curved side brush is the most visually distinctive change.

For distributors, service providers, and accessory buyers, these shared components create a new consumables compatibility group.

Roomba Plus 415/515/575 Accessories and Model Differences

The three models belong to the same generation but target different market positions.

The 415 is the entry model. The 515 offers stronger suction, longer runtime, and improved edge coverage. The 575 adds PrecisionVision AI obstacle recognition, enhanced threshold-crossing capability, and more advanced dock functions.

Roomba Plus Edge-Sweeping Brush Cleaning Along a Wall

iRobot states that the 415, 515, and 575 deliver 2.8, 3, and 3.5 times the suction power of their respective previous-generation models. However, no absolute Pa or airflow figures have been published, so these claims indicate product positioning rather than providing a direct real-world comparison.

Model numbers and dock configurations may vary by market. Buyers should therefore confirm the complete robot number and physical accessory interface before placing orders.

Why the New Side Brush Is Different

Conventional robot vacuum side brushes normally use two or three relatively straight arms. The new brush fitted to the Roomba Plus 415, 515, and 575 retains three arms but curves them in the direction of rotation.

This design combines three features:

• Three arms for frequent floor contact

• Curved profiles that may guide debris toward the main brush

• An extendable PerfectEdge mechanism for improved wall and corner coverage

Roomba Plus Robot Cleaning Beneath a Sofa

iRobot connects the three-prong brush with its tangle-resistant cleaning system, particularly in the Roomba Plus 575 product description. Early tests generally support its edge-cleaning performance: the brush can reach into corners and collect dust, sand, and small particles effectively.

However, tests have also shown that clumps of hair may still wrap around the side brush and main brush. The design should therefore be described as “tangle-resistant,” not “tangle-free.”

Comparing Side-Brush Anti-Tangle Designs

Three-prong side brushes have been used by Roomba and other robot vacuum brands for many years. Their main advantage is sweeping frequency, as the brush makes three floor contacts during each rotation.

More recently, some manufacturers have adopted two-prong curved brushes. The wider spacing between the arms may allow long hair to move along the curve and detach more easily. Five- and six-prong designs have also appeared but have not become mainstream.

iRobot’s new solution combines the sweeping frequency of three arms with a curved profile intended to improve debris flow and reduce tangling.

The company also continues to use a single-side-brush system instead of the dual brushes found on many other robot vacuums. Two brushes provide wider visible coverage, but the non-wall-facing brush may scatter particles or introduce another tangling point. With effective wall-following navigation, one extendable brush can focus cleaning where it is most useful.

What Compatible Side-Brush Development Requires

Producing a reliable compatible brush involves more than reproducing its appearance.

The center hole, locking position, axial height, and fastening method must match the original interface. Small dimensional errors can cause looseness, installation problems, or abnormal noise.

The three arms must also have consistent weight, curvature, and bristle length. Poor dynamic balance may create vibration and increase the load on the brush motor.

Material flexibility is equally important. The arms must maintain floor contact without becoming too soft to sweep effectively or too rigid for furniture and delicate surfaces. Because the brush extends outward, its operating path must also be verified in both retracted and extended positions.

Side-Brush Interface Fit Testing

Essential tests include:

• Installation and removal

• Extension and retraction

• Dynamic balance and noise

• Wall and corner cleaning

• Hair-tangling and removal

• Continuous operation and deformation

Filters, main brushes, and mop pads require the same attention to interface dimensions, sealing, rotation, materials, and long-term performance.

Preparing for Aftermarket Demand

New robot launches create future demand for consumables. As the installed base of the Roomba Plus 415, 515, and 575 grows, replacement side brushes, filters, main brushes, and mop pads will become increasingly important to distributors, repair businesses, and e-commerce sellers.

techTongBo has specialized in manufacturing and exporting robot vacuum replacement parts for many years. We continuously monitor new machines and accessory updates, with a focus on fitment accuracy, sealing, brush balance, durability, and cleaning performance.

Our compatible side brushes, filters, main brushes, and mop pads for the Roomba Plus 415/515/575 platform are currently undergoing physical installation and compatibility testing in preparation for future supply.

For specifications, samples, customized packaging, or OEM/ODM quotations, please contact the techTongBo team.

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techTongBo (also named: Nanjing TongBo / NJTB) is a Chinese company specializing in the manufacture and sales of vacuum cleaner accessories. We offer replacement accessories for the global market that are compatible with mainstream vacuum cleaner brands and have stronger price advantages.

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