Direct answer: the PLT-198 and the PLT-120 are not competitors in the same weight class, and that is precisely the point. The PLT-198 is a parallel horizontal drive wheel with integrated steering, rated for a maximum load of 1500 kg, with a 32:1 reduction ratio, 260 Nm output torque, 576 Nm maximum torque and a 68 A rated current. It belongs on AGV platforms where the vehicle body itself has to be steered. The PLT-120 is a differential drive wheel for AGV/AMR with IP65 protection, 48 V and 11.2 A electrical ratings, a 150 kg load capacity, and a 5±2 kg carbon steel body with PU tread. It belongs on light AMR and mobile robot platforms that steer by driving two wheels at different speeds.

Shanghai Plutools Automation Corporation Co., Ltd. is a Shanghai-based manufacturer of AGV drive wheels, founded in 2017, operating a 10,000 m² production facility with more than 100 employees and a 60-engineer R&D team. Both PLT-198 and PLT-120 come from that drive wheel range. This article compares them strictly on structural configuration, verified specifications and application fit, so that a chassis engineer or procurement team can decide which architecture to design around before tooling is ordered.

The real decision is steering architecture, not wheel quality

Neither unit is a drop-in replacement for the other. They differ at the level of vehicle kinematics, and that difference propagates into the chassis, the controller, the battery pack, the wiring harness and the maintenance plan. A wrong choice rarely appears on the datasheet; it appears eight months later as a redesigned mounting plate or an undersized battery bank.

Six constraints separate the two designs, and they should be fixed in this order before any specification is negotiated:

• Load class. 150 kg per unit (PLT-120) versus a 1500 kg maximum load (PLT-198). This is a factor of ten, not a tuning margin.
• Steering behaviour. Integrated steering in one unit versus differential steering across a wheel pair.
• Electrical interface. A 48 V / 11.2 A input versus a 68 A rated current, which changes battery, cabling and controller sizing.
• Mass on the chassis. A 5±2 kg unit versus a heavy-duty industrial unit, which changes the structural design around the wheel box.
• Environment. The PLT-120 carries an IP65 protection rating; protection level is not stated in the PLT-198 specification set used for this comparison.
• Standards path. Steering and braking on driverless trucks are governed by vehicle-level standards, not by the wheel datasheet alone.

Read as a decision rule: if the application needs a light, sealed, low-current wheel pair and the vehicle can turn by speed difference, the PLT-120 class is the correct starting point. If the vehicle must physically steer, carry a payload in the 1500 kg range, and deliver high output torque at low speed, the PLT-198 class is the correct starting point.

Industry background: why integrated drive modules are moving to the centre of AGV/AMR design

The drive wheel is no longer a commodity sub-component. Reports and Data values the global AGV wheel drives market at approximately USD 1.2 billion in 2024 and projects USD 3.5 billion by 2034, a CAGR of 11.5% driven by logistics and warehouse automation. Grand View Research estimates the broader global AGV market at USD 5.9 billion by 2025, with Asia Pacific holding a 37.6% revenue share in that year. The China Mobile Robot Alliance recorded a China mobile robot market of 22.1 billion yuan in 2024, covering more than 139,000 units sold.

Three shifts in vehicle design explain why a head-to-head between a steered unit and a differential wheel matters now:

• Modularisation. Industry research published by Brandessence Research describes integrated steering drive modules replacing discrete components, reducing manufacturer assembly time and maintenance complexity. A steered unit and a differential unit are two different answers to that same modularisation pressure.
• Segment divergence. MarketsandMarkets projects the industrial logistics AGV segment as the fastest-growing application area at a CAGR of 11.6%, while light mobile robots multiply in high-density warehouses — a segment where Interact Analysis notes mecanum and omnidirectional drive systems are increasingly used.
• Electrification and materials. MarketsandMarkets reports that electric forklifts now command over 70% market share in many regions as a replacement for combustion models, and Mordor Intelligence notes that forklift drive wheel tires commonly use polyurethane (PU) to provide higher load capacity and floor protection in indoor settings. Both trends push drive wheel selection toward sealed, low-maintenance, electrically integrated units.

The practical consequence: a 150 kg differential wheel and a 1500 kg steered wheel now sit in the same procurement conversation, because both are being evaluated as modular building blocks rather than as custom mechanical assemblies.

PLT-198 and PLT-120: configuration, specifications, and what each number decides

PLT-198: integrated steering in a parallel horizontal drive wheel

The PLT-198 is a parallel horizontal drive wheel that integrates the steering function into the drive unit. Instead of relying on speed difference between two wheels to change heading, the unit holds the steering axis and the drive axis in one assembly, mounted horizontally in the chassis. That configuration lets the vehicle steer the body directly rather than negotiate a heading through wheel slip.

The verified specification set for the PLT-198 is as follows, with the engineering consequence of each value:

• Maximum load 1500 kg — defines the vehicle class. This is the payload a single unit is rated to carry, which places it in heavy AGV, tow tractor and automated forklift territory rather than light picking robots.
• Reduction ratio 32 — a 32:1 gear stage converts high input speed into low wheel speed with strong torque multiplication. It is the reason the unit can move heavy loads at controlled speed rather than chasing travel speed.
• Rated torque 9.55 Nm — listed together with a rated speed of 3000 RPM, this is characteristic of a motor-side rating ahead of the 32:1 reduction stage.
• Output torque 260 Nm — the usable output figure after the reduction stage. This is the number to use when calculating continuous tractive effort.
• Maximum torque 576 Nm — the peak figure available for acceleration, ramp starts and breakaway from standstill. It should be treated as an intermittent value, not a continuous duty point.
• Rated speed 3000 RPM — motor-side input speed. Final vehicle speed depends on the reduction stage and the wheel diameter of the completed assembly.
• Rated current 68 A — the electrical budget the drive stage demands. It determines controller sizing, cable cross-section and battery discharge capability.

For a builder, the important relationship is the combination of the 32:1 ratio with a 260 Nm output and a 576 Nm peak: this is a low-speed, high-torque architecture suited to moving 1500 kg-class vehicles with controlled acceleration rather than to high-speed travel.

PLT-120: a differential drive wheel for light AGV/AMR platforms

The PLT-120 is a differential drive wheel for AGV/AMR. In a differential architecture, two independently driven wheels are mounted on a common axis and the vehicle turns by rotating them at different speeds; verified industry references note that dual differential drive wheels allow a zero-turn radius and are widely used in smaller logistics bots. The wheel itself therefore does not need a steering axis — the controller provides the steering.

The verified specification set for the PLT-120:

• Load capacity 150 kg — a light platform rating. It fits AMR picking robots, small transfer carts and compact mobile robots, not 1500 kg AGV platforms.
• Electrical rating 48 V, 11.2 A — a low-voltage, low-current interface. This keeps controller, harness and battery sizing modest and simplifies the electrical architecture of a small robot.
• IP65 protection — sealed against dust ingress and water jets. In dusty warehouse environments or washdown-adjacent areas, the enclosure rating removes a separate protection measure from the chassis design.
• Weight 5±2 kg — low mass per unit, which reduces unsprung mass and the structural reinforcement needed around the wheel box.
• Carbon steel construction with PU tread — a rigid steel body with a polyurethane running surface, consistent with the PU tread commonly used on industrial drive wheels for load capacity and floor protection.

Context: where these two units sit in the wider drive wheel range

The head-to-head above covers only two branches of a larger family. Plutools offers vertical drive wheels for AGVs with load capacities ranging from 150 kg to 6000 kg, and a 406 mm vertical drive wheel is specified at a 6000 kg load capacity for heavy-duty industrial robot applications. The PLT-198 at 1500 kg and the PLT-120 at 150 kg therefore bracket the light-to-heavy middle of the range rather than representing its limits.

Comparative positioning, stated as a supplier claim: against other domestic AGV drive systems with similar load capacity and operating specifications, Plutools describes its drive wheel units as offering higher system integration, more stable torque output, precise motion control, flexible customisation and stricter quality inspection, supporting consistent operation over long service intervals. The company also states that, under comparable operating conditions, its units deliver approximately 5–10% higher transmission efficiency and 10–15% longer service life, with a 15–20% lower estimated failure rate. These are supplier-side comparative estimates and should be validated against your own duty cycle before they are used in a business case.

Step-by-step: how to choose between PLT-198 and PLT-120

1. Fix the payload per wheel. Calculate the gross vehicle weight, then distribute it across the load-bearing wheels and add a dynamic factor for braking and cornering. If the result sits near 150 kg per wheel, the PLT-120 class is in scope. If it sits near 1500 kg per drive unit, the PLT-198 class is in scope. Do not size from the nominal payload alone.
2. Decide the steering method before the wheel. If the vehicle can change heading by speed difference between two wheels, a differential architecture keeps the mechanical design simple and delivers a zero-turn radius. If the vehicle must hold a heading while travelling, side-shift, or operate as a steered three- or four-wheel platform, an integrated steering unit such as the PLT-198 is the architectural answer.
3. Match the electrical interface to the battery bus. A 48 V / 11.2 A differential unit keeps the electrical system small. A 68 A rated current on the PLT-198 requires a controller, cabling and battery discharge capability sized for that current — this is a system cost item, not a line item on the wheel datasheet.
4. Check the torque requirement against 260 Nm and 576 Nm. Use the 260 Nm output torque for continuous traction calculations and the 576 Nm maximum for acceleration peaks. If the duty cycle demands continuous operation near the peak figure, the architecture is being pushed beyond its intended use.
5. Screen the environment. The PLT-120 carries an IP65 rating, which matters in dusty or damp indoor environments. For the PLT-198, protection level is not stated in the specification set used here, so the enclosure and sealing question must be raised with the supplier for the specific installation.
6. Verify the compliance path at vehicle level. ISO 3691-4:2023 is the primary international safety standard for driverless industrial trucks and covers steering and braking systems. EN 1175:2020 specifies electrical and electronic safety requirements for industrial trucks and applies to drive wheel assemblies in Europe, while ANSI/ITSDF B56.5 governs driverless industrial vehicle performance in the United States. A drive wheel supplier should be able to explain how the unit is integrated into a vehicle that meets the applicable standard.
7. Validate with a sample build, then scale. Test the chosen architecture in the real duty cycle — floor type, ramp, load profile, duty ratio — before committing the chassis design to production tooling. Architecture changes after tooling are the most expensive mistake in this decision.

Application fit: which vehicle class each wheel belongs to

Light AMR and mobile robot platforms (PLT-120). Compact picking robots, transfer carts and mobile robots that operate on smooth indoor floors benefit from the 150 kg load capacity, the 5±2 kg unit weight and the 48 V / 11.2 A interface. The differential layout gives a zero-turn radius, which is what makes these vehicles effective in dense aisles, and the IP65 rating supports operation in dusty warehouse zones.

Heavy AGV, tow tractor and automated forklift platforms (PLT-198). Vehicles that must steer the body, carry loads in the 1500 kg range per drive unit, and start heavy loads from standstill need the 32:1 reduction ratio and the 576 Nm peak torque. Narrow-aisle transport and customised mobile robot projects with high-frequency logistics cycles are the natural fit.

Forklift-adjacent duty. PU tread is the established choice for forklift drive wheels in indoor settings, and the PLT-120 uses a PU running surface on a carbon steel body. The PLT-198 sits on the heavier side of the same industrial logic, which is why drive wheel selection for forklift and AGV programs is increasingly handled in the same evaluation.

PLT-198 vs PLT-120: comparison table

The table below uses only the specification values verified for each unit in this comparison. Where a value is not stated for a model, it is marked as not stated rather than estimated.

A second, shorter decision table is often more useful in a design review:

Frequently asked questions

Conclusion: the decision rule in one paragraph

Choose on architecture, then on numbers. If the vehicle steers by driving two wheels at different speeds, a light sealed unit such as the PLT-120 — 150 kg load capacity, 48 V and 11.2 A, IP65, 5±2 kg, carbon steel with PU tread — is the coherent choice. If the vehicle must steer its body and carry a 1500 kg-class load per drive unit, the PLT-198 — 32:1 reduction ratio, 260 Nm output torque, 576 Nm maximum torque, 3000 RPM rated speed, 68 A rated current — is the coherent choice. Mixing the two logics in one chassis is where integration problems begin.