Building a off-road vehicle, pick-up or overland expedition rig – such as a Ford Ranger (Raptor), RAM 1500, Toyota Hilux / Land Cruiser, Jeep Wrangler, Nissan Navara or Isuzu D-Max – requires a fundamentally different wheel and tyre approach than a regular passenger car. Where street cars prioritise low rolling resistance, slim tyre sidewalls and high positive offset values, the 4x4 and off-road world focuses on maximum rock and sand traction, extreme sidewall protection, massive axle loads and a wide, stable track width.
When purchasing off-road wheels from global brands like Fuel Off-Road, Method Race Wheels, KMC Wheels and Black Rhino owners immediately encounter specific techniques: "What does a negative offset value (such as ET-12 or ET-44) mean for pick-up wheels?", "Why are fender flares legally required for such wheels?", "How does the patented Method Bead Grip® technology let you safely run at 0.8 bar without expensive beadlocks?" and "Which All-Terrain (A/T) tyre size fits under a 3,500 kg type-approved truck?" In this technical guide the 4x4 specialists at Wheels 'N Customs explain the complete geometry, tyre technology and vehicle inspection (APK) legislation for you.
1. Negative Offset Values (ET): Explained from ET0 to ET-44
The ET value (Einpresstiefe / Offset) indicates in millimetres the distance between the wheel’s mounting face and the exact width centreline of the wheel. While passenger cars typically run a positive ET of +35 to +55 (the mounting face sits towards the road side, causing the wheel to tuck in), tough 4x4 wheels almost always use a low, zero or deeply negative ET value:
ET 0 (Zero Offset)
The mounting face lies exactly in the middle of the wheel barrel. Very popular as a mild off-road setup (e.g. 17x8.5J or 17x9.0J ET0). Moves the wheel approximately 30 to 45 mm further outwards than the original factory alloy, creating a wide stance without immediately requiring extreme flares.
ET -12 to ET -24 (Deep Dish)
The mounting face sits 12 to 24 millimetres inwards towards the brake disc. This pushes the entire wheel barrel aggressively outwards. The wheel gains a pronounced deep outer lip (deep dish) or deeply concave spoke profile and increases track stability on steep slopes.
ET -44 (Extreme Deep Dish Truck)
The ultimate American truck look, commonly used by brands like Fuel Off-Road on 20x10J or 20x12J wheels. The mounting face is recessed 44 mm inwards. The wheel has a massive lip of 10 to 15 centimetres and protrudes significantly beyond the standard bodywork.
Legal Requirement for Fender Flares
Fitting wheels with ET-12, ET-18 or ET-44 under a Ford Ranger or RAM 1500? Then the wide tyre sidewalls and tread quickly stick out 40 to 90 mm beyond the steel mudguards. In Europe this immediately leads to police checks and APK failures:
Netherlands (RDW/APK Requirement): The patterned tread of the tyre may protrude a maximum of 30 millimetres beyond the vehicle’s body protection. Anything beyond that is illegal due to the danger of gravel being thrown at following traffic.
Belgium (GOCA Inspection): The tyre and the wheel must sit 100% fully within the wheel arches (0 mm protrusion allowance).
The Solution: Fitting robust Pocket Style or Bolt-On Fender Flares (fender flares from e.g. OneWay Automotive or Bushwacker). These widen the body by 35 to 75 mm per side and immediately restore the 100% legal wheel coverage.
2. Method Race Wheels Bead Grip®: Driving at 0.8 Bar Without Real Beadlocks
When you drive in heavy terrain – such as loose dune sand, deep clay mud or rocky mountain tracks – lowering the tyre pressure (airing down) is the most effective way to create grip. Letting the tyre down from 2.5 bar to for example 0.8 to 1.0 bar (12-15 PSI) flattens the tread. The contact patch with the ground (the footprint) triples, causing the vehicle to 'float' over the sand instead of digging itself in.
The Problem with Standard Wheels & Real Beadlocks
On a standard wheel, an extremely low tyre pressure can cause the tyre bead to suddenly slip out of the rim seat in a sharp turn or on rock contact (de-beading). Within one second all remaining air escapes and you are left stationary on a bare rim.
Traditional competition beadlocks solve this with a steel outer ring clamped with 24 to 32 bolts. However, real mechanical beadlocks are illegal on European public roads (no TÜV/DOT road approval), often leak air around the bolts and require constant retorquing.
The Patented Method Bead Grip® Revolution
The American Method Race Wheels has developed the ultimate compromise with Bead Grip® technology (used on the MR701, MR702, MR703 and MR704 series, among others):
Integrated Safety Grooves: Patented, profiled ribs are machined into the aluminium on both the inner and outer rim flange that mechanically bite into the tyre bead rubber.
Raised Safety Hump: A more aggressive internal safety ridge prevents the tyre from being pushed axially into the deep centre bed.
100% Road Legal & Maintenance-Free: Because no separate outer rings or bolts are used, the wheel is cast as a one-piece, 100% airtight and fully road legal for the European MOT inspection!
3. Tyre Choice: All-Terrain (A/T) vs. Mud-Terrain (M/T) & Size Conversion
Under a tough 4x4 wheel belongs a matching off-road tyre. In the off-road sector we distinguish between two main tread types:
All-Terrain (A/T) – The 50/50 All-Rounder
Leading tyres such as the BFGoodrich All-Terrain T/A KO2 / KO3, Falken Wildpeak A/T3W and General Grabber AT3. They offer a perfect balance between robust off-road traction and acceptable road noise, braking behaviour and comfort on the highway.
Fitted with the official 3PMSF (Alpine) snowflake symbol: 100% approved as a winter tyre in Germany and Austria!
Mud-Terrain (M/T) – The 80/20 Extreme Specialist
Tyres such as the BFGoodrich Mud-Terrain KM3 or Maxxis Trepador. Equipped with deep, self-cleaning tread blocks and steel sidewall reinforcements. They offer unrivalled grip in deep mud and on rocks, but produce significantly more road noise on asphalt and wear faster with intensive highway use.
American Flotation Sizes vs. European Metric Tyre Sizes:
On pickups tyre sizes are often given in inches (e.g. 35x12.50 R20). This means: overall outer diameter 35 inches (approx. 89 cm), width 12.5 inches (approx. 318 mm) on a 20 inch rim. In European metric sizes this roughly corresponds to a 315\/60 R20 or 325\/60 R20. A popular '33 inch' tyre usually translates to a 285\/70 R17 or 275\/60 R20.
4. Heavy-Duty Load Ratings: Load capacity for 3,500 kg Trucks & Towing
A heavy pick-up such as a RAM 1500 or Ford Ranger has, on the registration, a maximum permissible gross weight up to 3,500 kg and a towing capacity of 3,500 kg. When the bed is loaded and a heavy trailer or mini-excavator hangs from the coupling, enormous dynamic forces act on the rear axle:
Minimum Wheel Load Rating (Load Rating): Standard SUV wheels (750 to 850 kg per wheel) are insufficient and dangerous under heavy pick-ups. Off-road brands like Fuel Off-Road, Method and Black Rhino design their wheels specifically with load capacities of 1,050 kg, 1,250 kg up to over 1,650 kg per wheel (2,300 to 3,640 lbs).
Light Truck (LT) & Load Range E Carcasses: For off-road tyres always choose the LT (Light Truck) designation with Load Range E (10-ply rating). These tyres have triple-reinforced steel belts and sidewalls that withstand high axle loads, sharp stones and tyre pressures up to 5.5 bar.
Robust Wheel Fastening: Heavy pick-ups use thick M14x1.5 or 9\/16" studs. Wheels 'N Customs supplies hardened steel wheel nuts (spline-drive or hardened cone) with every 4x4 wheel set which are tightened to the specified torque of 170 to 190 Nm.
5. Fitment Table: Popular 4x4 & Pick-Up Models
Vehicle model
Bolt pattern (PCD) & Centre bore
Popular Wheel Sizes
Recommended A\/T Tyre Size
Ford Ranger / Wildtrak (2012-2022)
6x139.7 • CB 93.1 mm
17x8.5J ET0 to ET+20 | 18x9.0J ET+12
265/65 R17 | 265/60 R18 A/T
Ford Ranger Raptor (V6 / Fox Shocks)
6x139.7 • CB 93.1 mm
17x8.5J ET+10 | 17x9.0J ET0
285\/70 R17 (33x11.50 R17) KO2\/KO3
RAM 1500 (Dodge RAM 5.7 V8)
5x139.7 • CB 77.8 mm
20x9.0J ET+1 to ET-12 | 20x10J ET-18
275/60 R20 | 33x12.50 R20 | 35x12.50 R20
Toyota Hilux & Land Cruiser 150
6x139.7 • CB 106.1 mm
17x8.5J ET0 to ET+15 | 18x9.0J ET0
265\/65 R17 | 265\/70 R17 Heavy Duty
Jeep Wrangler (JK / JL) & Gladiator
5x127 (5x5") • CB 71.5 mm
17x8.5J ET-12 to ET0 (Method / Fuel)
285\/70 R17 | 35x12.50 R17 A\/T or M\/T
Isuzu D-Max & Nissan Navara D23
6x139.7 • CB 100.1 / 66.1 mm
17x8.5J ET+15 to ET+20 | 18x9.0J ET+15
265\/65 R17 | 265\/60 R18 All-Terrain
Related 4x4, Wheels & Fitting Knowledge Base Guides
Have Your 4x4 & Pick-Up Wheelset Professionally Fitted in Nijkerk
Don’t take risks with insufficient wheel load capacity, tyres rubbing the inner arch or incorrect torque settings. In our professional workshop at Riddererf in Nijkerk our technicians safely lift your heavy truck or 4x4 on our heavy-duty lifts. We fit complete Fuel, Method and KMC wheelsets including heavy A/T tyres, steel valves, calibrated torque-wrench final checks and programmed TPMS sensors.
Not sure if a negative ET value will fit without a lift kit or want to know which All-Terrain tyre size best matches your use? Our 4x4 specialists are happy to calculate that with you right away.
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