Kubota RTV Tires, Wheels and Installation Guide

November 1, 2026 dbtractor Kubota, Kubota Parts, Kubota RTV, Kubota Snowblowers Comments Off on Kubota RTV Tires, Wheels and Installation Guide
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Kubota RTV Tires, Wheels and Installation Hardware: Compatibility Guide

Kubota RTV tires and wheels vary between vehicle families, equipment grades and production periods. Legacy RTV400Ci and RTV500 applications use different front and rear tyre sizes, while documented Sidekick and numeric RTV-X configurations include 25 × 10-12 assemblies.

Newer RTV-X models also introduce HDMP tyre options, so an older catalogue should not be treated as a universal specification for the current range.kubotausa+1

Replacement wheels require more than a matching rim diameter. The correct assembly must suit the vehicle, axle position, tyre specification and mounting hardware. Kubota’s accessory literature distinguishes directional left- and right-hand assemblies, steel and alloy wheels, and separate hardware kits for specified alloy installations.kubotausa+1

This guide covers documented current and legacy tyre options, selected wheel-assembly references, alloy-wheel hardware and the checks needed before replacing or upgrading an RTV wheel set.

The focus is North American manufacturer information. Archived part numbers are identification references, not guarantees of present availability. Confirm the full model, serial information, fitted equipment and current application before ordering.

And See:

Kubota RTV Tires and Wheels at a Glance

Vehicle group Documented tyre arrangements Important distinction
RTV400Ci / RTV500 24 × 9-12 front and 24 × 11-12 rear in archived accessory literature Front and rear assemblies differ
RTV520 Model-specific front and rear applications Do not assume every legacy smaller-RTV assembly fits
RTV-XG850 Sidekick Documented 25 × 10-12 steel and alloy assemblies ATV assemblies can be directional
Earlier numeric RTV-X models ATV, HDWS and selected turf configurations Availability differs by model and grade
Newer RTV-X models ATV and HDMP options in recent literature Check current specifications rather than copying older HDWS listings
Factory-cab and crew models Grade- and model-specific wheel options A similar tyre size does not establish complete assembly interchangeability

The smaller-RTV and Sidekick references come from Kubota’s accessory brochures. Historical numeric RTV-X specifications and newer RTV-X literature document the other categories.kubotausa+2

Identify the RTV Before Buying Tires or Wheels

Start with the complete vehicle designation and serial information.

Important distinctions include:

  • RTV400Ci versus RTV500.

  • RTV500 versus RTV520.

  • RTV900 or RTV900XT versus RTV-X900.

  • RTV1100 versus RTV-X1100C.

  • RTV1140CPX versus RTV-X1140.

  • Numeric RTV-X models versus newer descriptive-name vehicles.

  • Diesel RTV-X vehicles versus the gasoline Sidekick.

Kubota maintains separate parts applications for these families. A wheel advertised simply as fitting a “Kubota RTV” does not provide enough information to establish compatibility.kubotausa+2

Information to Record

Item Why it matters
Full vehicle model Establishes the correct family
Serial information Helps resolve production changes
Existing front tyre markings Identifies the current front specification
Existing rear tyre markings Reveals whether front and rear differ
Wheel identification Helps establish the actual assembly
Steel or alloy construction Affects the required mounting application
Direction markings Helps identify left/right installation requirements
Existing hardware Establishes whether the correct kit is present
Modifications Reveals non-original wheels, spacers or other changes

A previously fitted wheel is not proof of an approved application. Used vehicles may have been modified.

Kubota RTV Tire Types Explained

Kubota’s literature uses several tyre-category names. Keep those categories distinct rather than describing every option as an “ATV tyre.”

ATV, HDWS, HDMP and Turf Tyres

Tyre category Manufacturer terminology Documented characteristics
ATV All Terrain Vehicle / All Terrain Archived accessory assemblies are identified as directional
HDWS Heavy Duty Work Site Archived assemblies are identified as non-directional
HDMP Heavy Duty Multi-Purpose Newer RTV-X literature identifies this as a separate option
Turf Turf tyre Available on selected historical numeric RTV-X configurations

Kubota’s archived operator’s manual uses “Heavy duty work site tyre” for HDWS, while recent literature explicitly expands HDMP as Heavy Duty Multi-Purpose.kubotausa+1

HDWS vs HDMP

Do not assume HDMP is merely another name for the same HDWS tyre.

Kubota’s newer RTV-X brochure describes the heavy-duty tyre as having more aggressive styling and improved wear on paved surfaces compared with HDWS, based on its internal testing. That is a manufacturer comparison for the documented tyre—not a universal performance claim for every tyre carrying a similar description.kubotausa

ATV Directionality

The archived Kubota accessory assemblies distinguish left and right ATV wheels.

That distinction appears in both the smaller-RTV and Sidekick listings. HDWS assemblies are described as non-directional.kubotausa+1

Use the actual tyre markings and installation instructions. Do not mount an identified left-hand directional assembly on the opposite side simply because the wheel attaches to the hub.

Legacy RTV400Ci and RTV500 Tyre-and-Wheel Assemblies

Kubota’s archived smaller-RTV accessory literature lists both ATV and HDWS steel-wheel assemblies.

RTV400Ci / RTV500 ATV Assemblies

Position Documented reference Published tyre size Brochure specification
Front left K7311-19110 24 × 9-12 Six-ply listing; directional
Front right K7311-19160 24 × 9-12 Six-ply listing; directional
Rear left K7311-19210 24 × 11-12 Six-ply listing; directional
Rear right K7311-19260 24 × 11-12 Six-ply listing; directional

Each listed assembly includes one OEM tyre and one steel wheel. The references are documented for RTV400/RTV500 in the archived brochure.cdnmedia.endeavorsuite

RTV400Ci / RTV500 HDWS Assemblies

Position Documented reference Published tyre size Brochure specification
Front K7311-19310 24 × 9-12 Six-ply listing; non-directional
Rear K7311-19410 24 × 11-12 Six-ply listing; non-directional

The front/rear distinction remains important even though the tread is non-directional.cdnmedia.endeavorsuite

Do These Assemblies Fit the RTV520?

Do not infer complete wheel-assembly interchangeability from a similar tyre size.

The RTV520 has its own operator’s manual and parts applications. Use the current model-specific catalogue to confirm an assembly, rather than extending an RTV400/RTV500 brochure listing automatically.manualslib

The same caution applies when ordering tyres separately: the tyre specification and the complete wheel-assembly application are related but different questions.

Sidekick Steel Tyre-and-Wheel Assemblies

Kubota’s archived Sidekick literature lists 25 × 10-12 steel-wheel assemblies.

Documented Sidekick Steel Assemblies

Tread / position Reference Published tyre size Important detail
ATV left K7811-19210 25 × 10-12 Directional
ATV right K7811-19260 25 × 10-12 Directional
HDWS K7811-19410 25 × 10-12 Non-directional

The full-line accessory brochure describes each as one OEM tyre and steel wheel, with a six-ply specification.cdnmedia.endeavorsuite

Do not confuse these K7811 references with the similarly numbered K7311 smaller-RTV assemblies.

Sidekick and Documented Alloy-Wheel Options

Kubota’s accessory literature lists several alloy-wheel colours and tread combinations.

Alloy Tire-and-Wheel Assembly Directory

Wheel colour Tread / position Documented reference Published tyre size
Green ATV left K7811-99850 25 × 10-12
Green ATV right K7811-99860 25 × 10-12
Green HDWS K7811-99800 25 × 10-12
Black ATV left K7591-99850 25 × 10-12
Black ATV right K7591-99860 25 × 10-12
Black HDWS K7591-99800 25 × 10-12
Silver ATV left K7591-99830 25 × 10-12
Silver ATV right K7591-99840 25 × 10-12
Silver HDWS K7591-99790 25 × 10-12

These assemblies appear in Kubota’s Sidekick accessory literature. The brochure lists one OEM tyre and alloy wheel per assembly, six-ply tyres, directional ATV tread and non-directional HDWS tread.kubotausa+1

The retained K7591-99790 listing independently identifies a silver alloy wheel with a 25 × 10.00-12 HDWS tyre.kubotausa

One Assembly Is Not a Set of Four

The documented product is one tyre-and-wheel assembly.

When pricing a complete change, establish the quantity, required left/right combinations and separate hardware requirements. Do not assume a single listing includes all four wheels.kubotausa

Alloy-Wheel Installation Hardware

Kubota explicitly lists separate hardware kits for the documented alloy-wheel assemblies.

Alloy Hardware References

Hardware kit Reference Manufacturer description
Black alloy-wheel hardware K7591-99140 Required hardware reference for the specified alloy assemblies
Silver alloy-wheel hardware K7591-99170 Alternative listed hardware reference

The archived alloy-wheel listings require the appropriate hardware kit.kubotausa+1

Do Not Reuse Hardware Without Confirmation

Do not assume the hardware from a steel wheel is correct for an alloy replacement.

Use the current wheel application and installation instructions to confirm:

  • Required hardware kit.

  • Fastener specification.

  • Correct seating arrangement.

  • Thread engagement.

  • Tightening procedure.

  • Torque.

  • Recheck requirement.

The brochure establishes that a separate kit is required, but it is not a complete fastener specification sheet.

Do Not Select Hardware by Colour Alone

The black and silver descriptions identify documented kits. They do not establish that appearance is the only difference or that any similarly coloured wheel nuts are suitable.

Confirm the exact kit against the complete wheel reference.

Earlier Numeric RTV-X Tyre Options

Kubota’s historical RTV-X brochure documents ATV, HDWS and selected turf configurations.

The listed numeric models include RTV-X900, RTV-X1120 variants, RTV-X1100C and RTV-X1140. Their equipment tables distinguish tyre and alloy-wheel availability by grade.kubotausa

Historical Numeric RTV-X References

Category Documented information Limitation
ATV 25 × 10-12 entries in the archived specification table Confirm the model, grade and actual tyre
HDWS 25 × 10-12 entries Do not assume every wheel shares one assembly number
Turf Selected configurations Not universally offered
Alloy wheels Available or standard on specified grades Archived brochure excludes alloy wheels with turf tyres

These are historical manufacturer configurations, not approval for any wheel combination that appears to match the dimensions.kubotausa

Use the exact parts application for the vehicle rather than transferring a Sidekick wheel number to a diesel RTV solely because both use a 25 × 10-12 marking.

Current RTV-X, CAB and CREW Tyres

Newer manufacturer information includes HDMP tyres and model-specific alloy-wheel choices.

Current-Range Research References

Model / listing Documented tyre or wheel information Research point
RTV-X Standard Heavy Duty Multi-Purpose tyre description Use the current specification
RTV-X Premium HDMP description and alloy-wheel availability by configuration Colour/grade can affect standard equipment
RTV-X CAB HD Standard HDMP tyres with steel rims; optional black alloy wheels Do not assume Premium equipment
RTV-X CREW Standard HDMP and alloy-wheel information Confirm the actual ordered configuration
RTV-X1130 Worksite Retained listing references HDWS or ATV Country-specific listings may retain older terminology

These references come from Kubota Canada and recent USA RTV-X literature. They show why a single old tyre table cannot describe every current vehicle.kubotausa+5

Where a product page mixes a feature description with an older-looking specification row, obtain the vehicle’s current order sheet and manual rather than combining both into an assumed specification.

Understanding Tyre Markings Without Assuming Fitment

A marking such as 25 × 10-12 helps identify a tyre size, but it does not establish complete compatibility.

The manufacturer listings also distinguish tread, wheel construction, direction and hardware.kubotausa

Information That Must Be Checked Separately

Item Why the size marking is not enough
Approved vehicle application The tyre must be suitable for the model
Front/rear position Smaller RTV applications use different front and rear sizes
Direction Certain assemblies are left/right specific
Wheel dimensions and mounting A shared rim diameter is not a complete fitment specification
Load and service capability Must meet the vehicle’s approved requirements
Hardware Alloy applications can require a separate kit
Inflation Comes from the applicable vehicle/tyre instructions
Clearance Must suit steering, suspension and installed equipment

Do not assign a universal bolt pattern, offset or hub specification to every Kubota RTV.

Tyre Pressure: Use the Correct Manual

There is no single pressure figure appropriate to every RTV.

For example, the published RTV500 operator’s manual lists 14 psi for its specified front and rear ATV/HDWS applications, while an RTV-X1100C manual lists 20 psi for its documented tyre configurations. These are examples from particular manuals—not a recommendation to use either value on another vehicle.rentalex+1

Pressure Checks

Establish:

  • The actual tyre fitted.

  • The vehicle and manual revision.

  • The approved pressure instructions.

  • Any applicable operating or loading conditions.

  • Whether the fitted tyre is an approved replacement.

Kubota’s RTV500 manual instructs owners to maintain the correct pressure and use approved tyres. It also identifies regular pressure inspection as part of maintenance.rentalex

Do not treat a maximum marking on a tyre as the universal operating-pressure setting for the vehicle.

Wheel Tightening and Rechecking

Wheel fastener torque is model- and application-specific.

The RTV520 operator’s manual warns against operating with loose wheel bolts and instructs owners to recheck after refitting and driving the specified distance, then according to the service interval.manualslib

Wheel Installation Information to Obtain

Requirement Correct source
Wheel and tyre approval Vehicle and parts application
Hardware kit Wheel installation information
Torque Applicable manual or approved kit instructions
Tightening sequence Applicable procedure
Recheck distance or interval Applicable manual
Support points Vehicle manual
Special requirements Wheel/kit instructions

Do not copy a torque value from a different RTV or a generic automotive chart.

If the wheel kit introduces different hardware, resolve its instructions against the vehicle application before installation.

Tyre Fitting and Wheel-Changing Safety

Tyre mounting and wheel removal are different tasks.

Kubota’s RTV500 and RTV-X1100C manuals state that mounting a tyre on a rim should be performed by a qualified person with the proper equipment.rentalex+1

The RTV-X1100C manual also instructs owners to securely support the vehicle when changing wheels.agtrac

Use the applicable vehicle procedure for parking, supporting, removing and reinstalling a wheel. Do not work beneath a vehicle supported only by an unsuitable lifting arrangement.

Oversized Tyres, Wheel Spacers and Aftermarket Wheels

Do not assume an oversized tyre or spacer is approved because it can be physically installed.

The reviewed Kubota accessory references establish specific assemblies and hardware. They do not provide blanket approval for alternative diameters, offsets, spacers or mixed tyre sets.kubotausa+1

Before considering a non-standard setup, obtain confirmation of:

  • Vehicle compatibility.

  • Wheel mounting specification.

  • Approved tyre size and construction.

  • Hardware requirements.

  • Steering and suspension clearance.

  • Required operating restrictions.

  • Effects on the approved vehicle configuration.

Kubota’s manuals instruct owners to use approved tyres.rentalex+1

Avoid claims that a larger tyre automatically improves towing, payload, ground clearance suitability or overall safety.

Inspecting Used Tyres and Wheels

A used assembly should be assessed by identity and condition, not appearance alone.

Used-Assembly Checklist

Area What to establish
Tyre identity Complete size, product and service markings
Vehicle application Correct model and position
Direction Correct left/right or rotation arrangement
Tyre condition Suitability for continued use, assessed by a competent person
Wheel condition Damage, distortion and mounting-surface condition
Identification Readable wheel or assembly reference
Hardware Correct complete kit
Modifications No unverified spacers or altered mounting
Availability Replacement components can be sourced

Do not use wheel paint colour as proof of a particular OEM assembly.

A visually matching used wheel may still be a different application or have an unsuitable tyre fitted.

Troubleshooting Tyre and Wheel Concerns

These are investigation routes, not claims that the problems are widespread.

Repeated Pressure Loss

Confirm the tyre and assembly identity, then have the tyre, valve and wheel assessed using appropriate procedures.

Do not repeatedly add pressure above the specified value to compensate for a fault.

Vibration After a Wheel Change

Verify the assembly, hardware and installation against the correct instructions before continuing normal use.

Do not assume the issue can be resolved by tightening fasteners beyond the specified torque.

Tyre or Wheel Contacts Another Component

Stop and confirm the application.

A wheel that attaches to the hub is not necessarily approved for the vehicle’s steering, suspension or accessory arrangement.

Directional Tyres Appear Reversed

Check the actual markings and the assembly’s intended position. Kubota’s documented ATV wheel sets distinguish left and right applications.kubotausa+1

Wheel Fasteners Become Loose

Treat this as a safety concern requiring correct inspection and installation—not simply a reason to keep tightening them.

Kubota explicitly warns against operating with loose wheel bolts.manualslib

Kubota RTV Tyres and Wheels FAQs

Do all Kubota RTVs use the same tyre size?

No. The archived smaller-RTV assemblies use 24 × 9-12 front and 24 × 11-12 rear tyres, while documented Sidekick assemblies use 25 × 10-12.cdnmedia.endeavorsuite

Are ATV tyre-and-wheel assemblies directional?

Kubota’s reviewed accessory listings identify the ATV assemblies as left/right directional and HDWS as non-directional. Check the actual tyre markings as well.kubotausa+1

Is one wheel-assembly listing a complete set?

The documented listings include one tyre and one wheel per assembly. Confirm quantity and position before ordering.kubotausa

Do alloy wheels need separate hardware?

The reviewed alloy listings require K7591-99140 black or K7591-99170 silver hardware kits. Confirm the current application.kubotausa

Are HDWS and HDMP the same tyre?

Do not assume so. Kubota identifies HDMP separately and compares newer heavy-duty tyre wear with HDWS in recent literature.kubotausa

Can Sidekick wheels be fitted to an RTV-X900?

Some documented assembly references appear across related accessory information, but a shared tyre size does not establish universal fitment. Confirm the exact wheel, hardware and vehicle application.

What tire pressure should I use?

Use the manual and approved tyre application for the actual vehicle. Documented RTV500 and RTV-X1100C pressures differ, so neither should be used as a universal RTV setting.rentalex+1

Can I mount a replacement tyre on the rim myself?

Kubota’s manuals direct tyre mounting to a qualified person with the proper equipment.rentalex+1

Does fitting stronger tyres increase payload?

Do not treat a tyre change as a new vehicle load rating. The approved vehicle limits remain a separate requirement.

Are legacy wheel references still available?

An archived listing does not guarantee current supply. Confirm supersessions, correct hardware and availability before purchase.

Compare steel versus alloy wheel options for RTVs

For most work-focused Kubota RTV owners, steel wheels are the practical default: they generally cost less to replace and make sense where cosmetic damage is expected. Alloy wheels are worth considering for their appearance and potentially lower weight, but neither material automatically provides better traction, higher payload or greater durability in every situation. The wheel’s approved application and construction matter more than the material alone.

Steel vs Alloy Wheels for Kubota RTVs

Comparison Steel wheels Alloy wheels
Purchase and replacement cost Generally less expensive Generally more expensive
Weight Usually heavier than a comparable alloy wheel Often lighter, but actual differences vary
Severe-impact behaviour More likely to deform or bend Can bend or crack; behaviour depends on design and manufacture
Corrosion Exposed steel can rust if its finish is damaged Does not develop steel-type rust, but can oxidize or corrode
Appearance Functional, usually simpler designs More design and finish choices
Cosmetic damage Often easier to accept on a working vehicle Scratches and damaged finishes may be more noticeable
Damage assessment A bent wheel still needs professional assessment Cracks, distortion or damaged mounting areas require professional assessment
RTV installation Must match the vehicle and approved hardware Must match the vehicle and may require a separate alloy hardware kit

The material comparisons are general wheel characteristics, not Kubota-specific strength or weight test results. Exact performance depends on the particular wheel.

When Steel Wheels Make More Sense

Steel wheels are a sensible choice for an RTV used primarily for farm work, material transport, grounds maintenance or other duties where replacement cost matters more than appearance.

Their main advantages are:

  • Lower typical replacement cost.

  • Less concern about cosmetic scuffs.

  • A tendency to bend rather than crack under certain severe impacts.

However, “steel” does not mean indestructible. A low-quality or incorrectly rated steel wheel is not necessarily stronger than a properly engineered alloy wheel. Do not assume a bent wheel can safely be straightened and returned to use without specialist assessment.

For an owner already running serviceable, correctly specified steel wheels, there is usually little reason to replace them solely because alloys are available.

When Alloy Wheels Make More Sense

Alloy wheels are worth considering when you want a different appearance or when an approved wheel offers a useful weight reduction.

Their main advantages are:

  • A wider selection of finishes and designs.

  • Potentially lower wheel weight.

  • No steel-type rust, although corrosion and finish damage remain possible.

The weight benefit needs checking against the actual products. Some alloy wheels are only marginally lighter than comparable steel wheels, and tyre choice can substantially change the complete assembly’s weight. Do not promise a noticeable improvement in RTV acceleration, ride quality or fuel consumption without model-specific evidence.

An RTV already supplied with approved alloy wheels does not automatically need conversion to steel for normal work.

Which Is Better for Traction, Snow and Towing?

Wheel material alone is not a reliable way to choose traction or load capability.

For an RTV, prioritize:

Requirement More important checks
Grip Approved tyre type, condition and operating pressure
Winter work Correct vehicle/tyre configuration and approved snow-equipment installation
Cargo carrying Vehicle limits, tyre capability and wheel application
Towing The RTV’s towing restrictions and complete approved configuration
Rough-ground use Wheel quality, correct tyre fitment and vehicle compatibility

Kubota’s literature offers both steel and alloy assemblies with ATV or HDWS tyres, illustrating that tread choice and wheel material are separate decisions. Its manuals direct owners to use approved tyres and the specified inflation pressure.

Neither a heavier steel wheel nor a stronger-looking alloy wheel authorizes exceeding the RTV’s published load limits.

Kubota-Specific Hardware and Fitment

Kubota’s documented Sidekick alloy-wheel options include separate hardware requirements:

Item Documented reference
Black alloy-wheel hardware kit K7591-99140
Silver alloy-wheel hardware kit K7591-99170

The listed alloy assemblies require the appropriate kit. Do not assume the hardware from a steel wheel can be reused. These are documented applications, not universal kit recommendations for every RTV.

Before changing wheels, confirm:

  • Full model and serial information.

  • Approved wheel and tyre combination.

  • Front/rear and left/right requirements.

  • Correct mounting hardware.

  • Applicable torque and recheck instructions.

  • Clearance around steering, suspension and installed accessories.

Kubota’s archived ATV assemblies are directional, while the listed HDWS assemblies are non-directional. A matching nominal tyre size does not eliminate those installation distinctions.

Practical Recommendation

Your situation Recommended approach
Budget-conscious working RTV Start with approved steel options and compare replacement costs
Existing steel wheels are sound Keep them unless there is a specific reason to change
Existing factory alloys are sound Keep them; alloy is not inherently unsuitable for work
Appearance-focused upgrade Consider approved alloys, including the complete hardware cost
Winter or salt exposure Inspect and maintain either material; alloys are not corrosion-proof
Damaged wheel Obtain professional assessment or replace with the correct approved assembly