BigHead front wheel & tire assembly for Toro TimeCutter/Exmark Quest Z-turn — 4.10x3.50-4 tire, 3/4" axle, grease zerk

BigHead 105-3471 front wheel and tire assembly is a direct-fit replacement for Toro TimeCutter and Exmark Quest Z-turn mowers using the 4.10x3.50-4 tire and 3/4" axle.

This replacement wheel assembly restores steering, traction, and lawn-friendly performance to zero-turn front caster wheels. Made with a durable plastic rim and a sawtooth tread rubber tire, the unit is built to resist punctures and abrasion while remaining lightweight for responsive handling. It includes a grease zerk for easy bearing lubrication and is sized to match OEM specifications so it installs without modification on compatible mower models.

Which mower models and part numbers will this replace?

This wheel assembly is manufactured to match the dimensions and mounting of Toro part 105-3471 and fits a range of TimeCutter and related models as well as some Exmark Z-turn machines. Check fitment against your mower's tire size and axle bore before purchasing.

• Direct OEM cross-reference: Toro part 105-3471 (1053471)
• Compatible Toro TimeCutter models: ZD380, ZD420, ZD530, ZD420T and various ZX series (examples include codes 74432, 74433, 74434, 74437, 74602, 74603, 74702, 74704, 74802, 74806)
• Also fits some Toro RZT and Exmark Quest Z-turn models listed by the manufacturer
• Tire size match: 4.10/3.50-4 with a 3/4" axle (0.78" inner diameter)

How does the design improve lawn care and steering?

The sawtooth tread pattern and lightweight plastic rim balance traction with turf protection, helping reduce scuffing while maintaining grip on grass, gravel, and uneven surfaces. The compact outer diameter and correct width keep steering responsive during tight turns and follow-up passes.

• Turf-friendly tread reduces lawn damage compared with aggressive industrial tires
• 360° caster steering enabled by low weight and proper bearing fit
• Puncture- and abrasion-resistant rubber for longer service life
• Grease zerk allows quick bearing maintenance to preserve smooth rolling

What are the exact dimensions and maintenance notes?

Understanding the wheel’s measurements helps confirm compatibility and safe operation. This assembly is an inflatable tire configuration, so routine pressure checks and bearing lubrication are recommended to retain performance and reduce premature wear.

• Outer diameter: 270 mm (10.6 inches)
• Width: 104 mm (4.1 inches)
• Inner diameter / axle bore: 20 mm (0.78 inches / 3/4")
• Grease zerk included; tire inflation requires regular pressure checks

How easy is installation and what tools are needed?

The assembly is designed for direct replacement on compatible machines; in most cases it installs using common hand tools and basic mechanical skills. Having a grease gun and a torque wrench ensures proper bearing lubrication and secure fastener tightening.

• Typical tools: socket set, pliers, torque wrench, grease gun
• No wheel modifications required when matched to the specified axle bore and tire size
• Expect a straightforward swap in most residential or commercial maintenance settings
• Follow mower manufacturer torque specs and safety procedures during installation

Who is this for: This BigHead 105-3471 wheel and tire assembly is aimed at homeowners, lawncare professionals, and small landscaping businesses who need a reliable, OEM-dimension replacement for Toro TimeCutter and compatible Exmark Z-turn mowers. It’s appropriate when you need to restore caster steering, replace a worn or damaged front tire, or upgrade to a more puncture-resistant tread without changing mower behavior. Verify your mower’s tire size (4.10/3.50-4) and 3/4" axle bore before ordering to ensure a trouble-free fit.