Kubota Wheel Spacers — 10mm & Custom Fitments by Bora
Our Kubota-specific wheel spacers are precision-CNC machined from aerospace-grade aluminum billet to widen your tractor’s stance and accommodate larger tires or implements. The 10mm profile delivers measurable stability improvements for slope work, loader operations, and three-point hitch applications without altering your factory wheel bearings or suspension geometry.
Each spacer set ships with Grade 10.9 zinc-plated lug bolts matched to your Kubota’s factory thread pitch and length requirements. We machine every hub-centric register to OEM tolerances, ensuring vibration-free installation on B, L, M, and MX series tractors. Whether you’re clearing snow, running a rotary cutter, or working uneven terrain, our spacers maintain factory load ratings while improving lateral stability.
- 10mm spacer thickness for controlled stance widening
- CNC-machined from 6061-T6 aerospace aluminum billet
- Hub-centric design maintains factory wheel bearing alignment
- Grade 10.9 zinc-plated lug bolts included with every set
- Anodized corrosion-resistant finish for outdoor equipment use
Why Kubota Operators Choose 10mm and Custom Spacers
Kubota compact tractors excel in confined spaces, but certain implements and tire upgrades demand additional track width for safe operation. Our 10mm wheel spacers provide the minimum effective stance increase for operators running oversized R4 industrial tires, six-foot rotary cutters, or front-end loaders on slopes exceeding 15 degrees.
Custom thickness options address specific clearance challenges — 25mm spacers accommodate aggressive tread patterns on mudding tires, while 40-50mm sets create the necessary offset for dual-wheel configurations on specialty agricultural applications. We calculate the optimal spacer thickness based on your tire diameter, implement weight, and typical operating angles to maintain your Kubota’s center of gravity within factory stability parameters.
Materials, Construction & Load Ratings
We machine all Kubota wheel spacers from continuous-grain 6061-T6 aluminum billet — the same material specification used in aircraft landing gear components. This temper designation delivers 45,000 PSI tensile strength while remaining 60% lighter than equivalent steel spacers, reducing unsprung weight on your tractor’s suspension.
Corrosion Resistance for Outdoor Equipment
Every spacer receives a Type II anodizing treatment that penetrates 0.001 inches into the aluminum surface, creating a ceramic-hard oxide layer resistant to road salt, fertilizer runoff, and hydraulic fluid exposure. The charcoal-gray finish conceals the minor surface abrasions typical of field equipment while maintaining dimensional stability through seasonal temperature swings from -40°F to 180°F.
Kubota Bolt Pattern Compatibility & Hub Bore Fitment
Kubota employs three primary bolt patterns across their compact and utility tractor lines: 4x110mm on B-series subcompact models, 5×114.3mm on L-series compact tractors, and 6×139.7mm on MX utility tractors. We maintain CNC programs for all three configurations plus legacy patterns found on pre-2010 M-series models.
Hub bore diameter varies by axle type — standard Kubota front axles use 67.1mm center bores, while rear axles range from 84mm on B2650 models to 110mm on MX5400 tractors. Our hub-centric registers are machined 0.05mm smaller than your axle hub diameter and 0.05mm larger than your wheel’s center bore, creating the interference fit required for concentric wheel rotation without relying on lug bolt tension alone.
Bora Spacers for Other Kubota Models & Agricultural Equipment
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Common Questions About Kubota Wheel Spacers
The correct thickness depends on your tire size, implement weight, and clearance requirements. Our 10mm spacers suit most operators upgrading to oversized R4 industrial tires or improving stability for loader work and slope mowing. If you’re installing aggressive-tread ag tires or need significant offset for dual-wheel configurations, 25mm to 50mm custom spacers provide the necessary clearance.
Contact our fitment team with your Kubota model, current tire size, and intended use — we’ll calculate the optimal spacer thickness to maintain your tractor’s stability and load ratings while achieving your clearance goals.
Yes. All Bora wheel spacers maintain your Kubota’s factory wheel load ratings when properly installed with the included Grade 10.9 lug bolts. Our hub-centric design distributes loader bucket weight and dynamic lifting forces across the full axle hub face, preventing the stress concentrations that cause lug bolt failures with non-hub-centric spacers.
We load-test every thickness option to verify performance under combined vertical loader loads and lateral ground engagement forces. The 10mm spacer set supports full bucket capacity on Kubota L-series tractors, while custom thickness options are rated based on your specific model’s maximum axle load as published in the operator manual.
Properly installed wheel spacers do not void Kubota’s factory warranty. The Magnuson-Moss Warranty Act prohibits manufacturers from denying warranty coverage solely because an aftermarket part was installed, unless that part directly caused the failure.
Bora spacers maintain OEM hub-centric fitment and wheel bearing preload, so they don’t alter your tractor’s suspension geometry or introduce abnormal wear patterns. If a warranty claim arises, you may need to demonstrate that the spacers were installed according to Kubota’s torque specifications — we provide model-specific installation instructions and torque documentation with every set to support warranty compliance.
For bolt pattern, measure center-to-center distance between two opposite lug holes on 4-bolt wheels, or measure the diameter of the circle passing through all lug hole centers on 5- and 6-bolt wheels. Common Kubota patterns are 4x110mm (B-series), 5×114.3mm (L-series), and 6×139.7mm (MX-series).
Hub bore diameter is measured at the raised center pilot on your axle hub — use dial calipers to measure the outside diameter of the hub pilot that fits inside your wheel’s center hole. Kubota front axles typically use 67.1mm bores, while rear axle bores range from 84mm to 110mm depending on model. Our <a href=”/measuring-guide/”>online measuring guide</a> includes step-by-step photos for accurate measurements.
Yes. Re-torque all lug bolts to the specified value after the first hour of tractor operation, then again at 10 operating hours. This two-stage re-torque accounts for initial spacer settling and wheel seating against the hub face.
After the 10-hour check, inspect lug bolt torque at your Kubota’s standard 50-hour service intervals or whenever you remove wheels for tire maintenance. We include a torque reference card with every spacer set listing your model’s proper specification — typically 85 ft-lbs for M12x1.5 bolts and 110 ft-lbs for M14x1.5 bolts.
Most aftermarket wheels are compatible as long as they match your Kubota’s factory bolt pattern and have a center bore equal to or larger than the axle hub diameter. Our hub-centric spacers require the wheel’s center bore to be within 0.2mm of the spacer’s outer register — typically 67.1mm for front wheels and 84-110mm for rear wheels depending on your model.
If your aftermarket wheels have oversized center bores, you’ll need hub-centric rings to adapt the wheel bore to match the spacer’s outer diameter. Contact us with your wheel specifications — we can confirm compatibility and provide hub rings if needed.
Our 10mm spacers are stock items that ship within 1-2 business days and suit the majority of Kubota operators widening stance for oversized tires or improved loader stability. The 10mm profile provides measurable handling improvements without significantly altering your tractor’s track width or center of gravity.
Custom thickness spacers from 15mm to 50mm are built to order for specific applications requiring greater offset — dual-wheel setups, extreme mud tire clearance, or compensating for non-standard wheel backspacing. Custom orders require 5-7 business days for machining and ship with extended-length lug bolts calculated for the increased spacer thickness. Both options use identical hub-centric construction and 6061-T6 aluminum billet.