The Toyota Land Cruiser 20 Series (J20), produced between 1955–1960, represents one of the earliest civilian-oriented Land Cruiser models. Built on a rugged ladder chassis with leaf suspension, it was designed primarily for durability and off-road use rather than modern comfort.
Due to its age, factory specifications are less standardized compared to modern vehicles, but based on historical data and cross-referencing with Land Cruiser fitment databases, we can establish accurate working specifications for tyre, wheel, and hub data.
Factory Wheel & Tyre Specifications
OEM Tyre Sizes (Period-Correct)
- 6.00-16 (factory standard cross-ply)
- 6.50-16 (optional upgrade)
- 7.00-16 (heavy-duty / off-road use)
Modern Equivalent Tyre Sizes
For customers running restored or modified vehicles:
- 215/85R16
- 235/85R16
- 245/75R16
These maintain similar rolling diameter while improving drivability and availability.
Factory Rim Specifications
- Rim Size: 16x4.5 – 16x5.5
- Wheel Type: Steel (multi-piece / split rim common)
- Offset: Approx. 0 to -10 mm
- Stud Pattern (PCD): 6x139.7 mm
The 6x139.7 PCD remains consistent across most Land Cruiser generations, making wheel upgrades easier.
Centre Bore (CB)
- Centre Bore: ~110 mm (hub-centric design varies due to early production tolerances)
Important note:
Early Land Cruisers are typically lug-centric, meaning centre bore is less critical than modern vehicles. However, correct hub fitment is still recommended for safety and load distribution.
Wheel Nut / Stud Specifications
- Thread Size: M12 x 1.5
- Seat Type: Conical (varies depending on aftermarket wheels)
Torque Specifications
- Wheel Nut Torque:
90–110 Nm
Because of the age of these vehicles, always:
- Re-torque after 50–100 km
- Inspect studs regularly (common wear point on vintage 4WDs)
Fitment Notes & Upgrade Guide
Common Upgrades
Owners typically upgrade to:
- 16x7 or 16x8 wheels
- All-Terrain tyres such as 235/85R16
Aggressive Off-Road Setup
- 285/75R16 (requires lift and clearance mods)
- Negative offset wheels for wider stance
Key Considerations
- Brake clearance (especially upgraded disc conversions)
- Steering lock clearance
- Guard trimming for larger tyres
A neutral offset (~ET0) is widely recommended for Land Cruiser platforms to balance clearance and stability.
Recommended Tyre Options (Australia Use)
For classic Land Cruiser builds in Australia:
- All Terrain (AT): Best balance for road + off-road
- Mud Terrain (MT): For heavy off-road builds
- Highway Terrain (HT): For restored / show vehicles
You can explore available options here:
https://autostw.com.au/search?type=product&q=235/85R16
Common Customer Questions (FAQ)
What is the best tyre size upgrade for Land Cruiser 20 Series?
235/85R16 is the most popular upgrade — maintains classic look while improving performance.
Can I run modern alloy wheels?
Yes, as long as:
- PCD = 6x139.7
- Correct stud seat
- Load rating is sufficient
Do I need hub rings?
Usually not required due to lug-centric design, but recommended for highway use.
Is it safe to replace split rims?
Yes — strongly recommended for safety and ease of maintenance.
Why Choose Autosport Tyreworld?
At Autosport Tyreworld, we understand both modern and classic 4WD fitments. Whether you are restoring a vintage Land Cruiser or building an off-road setup, we provide:
- Correct tyre sizing advice
- Safe wheel fitment solutions
- Performance and off-road tyre options
- Fast installation and expert service
Our Locations
647 Magill Road, Magill SA 5072
PH: 0452 641 023
411 Grand Junction Road, Wingfield SA 5013
PH: 0433 645 411
911 South Road, Clarence Gardens SA 5039
PH: 0420 299 911