Robots That Can Climb Stairs, From Spot to LimX TRON 2

Robots That Climb Stairs Today

Several commercial and research robots climb stairs today. These machines include four-legged robot dogs, wheeled quadrupeds, bipedal research units, and prototype delivery carriers. At The Bot Scout, every guide we write starts from the maker's published spec rather than the launch video. These units have public specs or listings at the time of writing.

Step capacity differs widely across designs. Boston Dynamics Spot lists a 300 mm maximum step height. Unitree lists 20 to 25 cm continuous stairs for the B2-W, and Deep Robotics reports 25 cm risers for the Lynx M20 Pro. Other machines climb stairs but publish no clearance numbers.

Pricing separates research hardware from industrial patrol machines. Unitree Go2 starts at $1,600 on the official Unitree store. In contrast, Unitree lists the industrial B2-W at $100,000 on its official store, and resellers list it from $88,900. Boston Dynamics requires direct contact for Spot pricing quotes. Consumer cleaning robots remain unreleased concepts. The table lists each robot's published stair figure and price status.

Mechanisms for Climbing Household Steps

Robots climb stairs by using articulated legs, hybrid wheel-leg assemblies, or tracked carrier accessories. Legged systems step directly from riser to riser. Quadrupeds plant individual feet on each step tread. LimX says TRON 2 uses visual input to plan its stair climb step by step.

Wheel-leg machines combine flat-ground rolling with stepped climbing motions. On flat ground, these machines roll quickly on powered wheels. When facing steps, wheel-leg robots lift each wheel assembly onto the next step. Deep Robotics Lynx and Unitree B2-W use this combined method.

Robot vacuum makers have tried two designs: Eufy's MarsWalker is a tracked carrier for a separate vacuum, and Roborock's Saros Rover concept puts wheel-legs on the vacuum itself. Neither has shipped to buyers.

Wheel-Legged Robots in the TRON 2 Category

Wheel-legged robots combine motorized rolling wheels with multi-jointed legs to traverse flat floors and staircases. A LimX Dynamics video shows TRON 2 rolling on wheels, switching to bipedal mode and walking up stairs on two legs. Shenzhen-based LimX Dynamics launched TRON 2 on 18 December 2025 as a tri-form research robot. Humanoids Daily reported EDU Edition prices of $20,000 for Dual-Arm and $25,000 for 3-in-1 setups. TRON 2 includes 28 active degrees of freedom. Read our detailed LimX TRON 2 review for hardware analysis.

Unitree builds two wheeled quadrupeds with distinct operating limits. Unitree lists the Go2-W on its official product page with an 18 kg weight, in-wheel motors, and 7-inch pneumatic tyres. Unitree states the Go2-W climbs or drops obstacles under 70 cm and reaches 2.5 m/s. Reseller Top3DShop lists the Go2-W at $13,999, while Roboworks lists versions from $20,695. For heavier tasks, the Unitree B2-W weighs about 85 kg and carries over 40 kg while walking. Unitree lists 20 to 25 cm continuous stairs.

Robotics and Automation News reported that the Deep Robotics Lynx M20 Pro climbs stairs with risers up to 25 cm. The Lynx M20 Pro carries 15 kg payloads and runs for about 2.5 hours. Deep Robotics launched the IP67-rated Lynx M20S in May 2026. In commercial logistics, Amazon acquired Rivr Two maker Rivr in March 2026, as reported by TechCrunch. Rivr Two reportedly carries about 30 kg of cargo up steps to reach residential doorsteps.

Robot Dogs Built for Stair Climbing

Quadrupeds are the largest group of stair-climbing robots on this list. Unlike wheeled carts, four articulated legs let these machines adjust foot placement across uneven steps. Boston Dynamics Spot is sold to industrial sites. Boston Dynamics lists a maximum step height of 300 mm (11.8 in) for Spot on its official product page. That is the highest stair figure in this guide.

Unitree offers quadruped options across different price tiers. The standard Unitree Go2 walks and climbs stairs, starting at $1,600 on the Unitree store. Unitree publishes no specific step-height limit for the standard Go2 on its store page. At the industrial level, the heavy B2-W lists for $100,000 on Unitree's official store. Resellers list the B2-W between $88,900 and $97,600. Check our Boston Dynamics Spot alternatives guide for direct quadruped comparisons.

Industrial quadrupeds handle harsh physical environments during multi-story patrols. Unitree specifies an ingress protection (IP) rating of IP67 and an operating temperature range from -20 °C to 55 °C for the B2-W. Boston Dynamics rates Spot at IP54 with an average runtime of 90 minutes. Reseller RoboStore lists the B2-W with a 45 Ah battery providing about 4 hours of runtime. Explore more commercial options in our review of industrial quadruped robots.

Delivery Robots on Residential Steps

Delivery and mobility developers design specialized robotic chassis to climb outdoor entry stairs and curbs. Amazon acquired Rivr in March 2026. The Robot Report covered the Rivr acquisition as an advance in doorstep delivery robotics. Rivr Two reportedly travels up to 15 km/h and carries about 30 kg of cargo. It uses articulated legs with driven wheels to step onto porches and climb residential steps. Rivr Two is not sold to the public.

Personal mobility concepts also explore legged stair climbing. Toyota demonstrated the Walk Me mobility chair at the Japan Mobility Show 2025. Yanko Design reported that the four-legged robotic chair walks and climbs stairs. Toyota has not published pricing, release dates, or step-height limits for the prototype. The Walk Me remains an experimental engineering demonstration. Read our overview of the Toyota Walk Me chair for further details.

Neither Rivr Two nor the Toyota Walk Me can be bought today: Amazon owns Rivr, and Toyota has shown the Walk Me only as a prototype.

Status of Stair-Climbing Robot Vacuums

No stair-climbing robot vacuum is currently available for purchase on the consumer market. Prototype systems have appeared at technology trade shows, but none has reached retail production. Eufy announced the MarsWalker, a tracked carrier for companion vacuums. Engadget reported that MarsWalker carries compatible cleaning units, but Eufy has not shipped production hardware. Roborock demonstrated the Saros Rover concept at CES 2026. Tech Advisor detailed the Saros Rover concept, which remains an unreleased research project without a launch date.

The MIGO Ascender stair-climbing vacuum did not deliver finished units to its crowdfunding backers. New Atlas covered the Ascender. Backer pledges were refunded. Homeowners must carry vacuums manually between levels. For full specifications on announced cleaning concepts, read our guide to stair-climbing robot vacuums.

Step Height Limits for Real Stairs

A robot's published step or stair height is the number to compare with your own stairs. Residential and commercial stair dimensions vary across buildings. Before considering a stair-climbing robot, measure your riser, then compare it directly against the manufacturer's published specifications. A robot cannot negotiate a staircase if the individual step riser exceeds the machine's rated clearance limit.

Published step limits vary substantially across existing robotic platforms. Boston Dynamics lists the highest stair figure here, a 300 mm (11.8 in) maximum step for Spot. Unitree specifies 20 to 25 cm continuous stairs for the B2-W on its official B2-W page. LimX publishes a 20 cm step capacity for TRON 2 in bipedal sole mode. Deep Robotics lists 25 cm risers for the Lynx M20 Pro. In contrast, Unitree publishes no stair-step height for the standard Go2 on its store page.

Stair geometry presents distinct physical demands beyond simple vertical clearance. Continuous stair flights require steady balance across successive risers. Unitree rates the B2-W for continuous stairs between 20 and 25 cm, forward climbing up to 40 cm, and slopes exceeding 45°. Unitree rates the Go2-W for slopes up to 35° and obstacles under 70 cm. Spot handles slopes of ±30°. Check your staircase slope angle and riser height against manufacturer numbers before evaluating any machine.

Choosing a Stair Robot by Purpose

Pick by what you need the robot to do. Academic researchers developing locomotion algorithms should look at the LimX TRON 2. TRON 2 offers 28 active degrees of freedom and switches between wheeled, bipedal, and dual-arm forms. Compare the system with earlier hardware in our LimX TRON 1 vs TRON 2 guide and our analysis of bipedal robots. Industrial facilities requiring site patrols should evaluate Boston Dynamics Spot, Unitree B2-W, or Deep Robotics Lynx M20 Pro. Spot lists published industrial specifications and a 300 mm step capacity. The Unitree B2-W carries over 40 kg while walking and costs $100,000 on Unitree's store.

Budget constraints and domestic requirements point toward entirely different choices. Hobbyists and software tinkerers can examine the quadruped Unitree Go2, which starts at $1,600 on the official store. However, homeowners looking for domestic floor maintenance must take a different path. If you have a multi-story house, do not wait for unreleased vacuum concepts or buy industrial hardware. Buy a standard robot vacuum for each floor. Dedicated cleaners cost a fraction of industrial robotics and clean multiple levels immediately.