When it comes to off-roading and extreme driving, the first thing that comes to mind for many enthusiasts is monster truck. Giant tires that rise above the ground create a unique visual effect and allow you to overcome obstacles that are inaccessible to standard SUVs. However, turning an ordinary jeep into a real “monster” requires not just desire, but also a deep understanding of the technical nuances.
Choice big wheels is a fundamental step that changes the geometry of the car, its behavior on the road and the requirements for the transmission. An incorrect approach to modernization can lead to rapid failure of expensive components or, worse, to an emergency situation on the highway. In this article, we'll take a closer look at what you need to know before installing giant wheels and tires.
Why choose huge tires for SUVs?
The main reason for installing larger diameter wheels on monster truck or a prepared SUV means increased cross-country ability. Increasing the ground clearance allows the car not to “sit on its belly” when overcoming deep ruts, logs or snow drifts. Additionally, the large contact patch improves traction on loose surfaces such as sand or mud.
However, it is worth remembering that size matters not only for cross-country ability, but also for image. The aggressive appearance attracts attention and makes the car stand out in the crowd. But aesthetics come at a price: fuel consumption increases, and the load on the engine and braking system increases. An increase in wheel diameter by just 10% can reduce acceleration dynamics by 15-20% and significantly increase braking distance.
Owners of such cars often forget about inertia. A heavy wheel is harder to spin and harder to stop. Therefore, before purchasing a set of “mega wheels”, you need to soberly assess the capabilities of your car and its readiness for regular transmission maintenance.
Technical requirements: suspension and body lift
You won't be able to simply buy large tires and put them on standard wheels - they will simply rest against the wheel arches when turning or compressing the suspension. To install wheels with a diameter of 35 inches or larger on most SUVs, you need suspension lift. This is a set of measures to increase the distance between the body and axles.
There are two main ways to lift a car. The first is a body lift (Body Lift), when spacers are installed between the frame and the body. This is cheaper and simpler, but does not increase suspension travel. The second is a suspension lift (Suspension Lift), which involves replacing springs, shock absorbers and levers. This method is more expensive, but gives a real increase in cross-country ability.
⚠️ Attention: When lifting the body by more than 5 cm, it is necessary to lengthen the stabilizer rods and check the length of the driveshaft. Ignoring this rule will lead to rupture of the CV joint boots or failure of the cardan when the wheels are suspended.
It is also critical to check the driveshaft angles. Once the machine is lifted, the angles may become critical, causing vibrations at high speeds. In some cases, the installation of double universal joints or axle lifts is required.
Use extended wheel studs when installing wheel spacers to ensure the wheel is securely mounted and to avoid thread stripping.
Wheel selection: offset, width and material
When selecting disks for For a monster truck, the key parameter is the offset (ET). To install wide tires, wheels with a negative offset are often required so that the wheel does not catch the suspension elements. However, too much negative offset increases the load on the wheel bearings.
The material of the discs also plays a role. Forged wheels are lighter and stronger, but significantly more expensive than their cast counterparts. For extreme off-road driving, where strong impacts on rocks are possible, many people prefer steel wheels. Their main advantage is maintainability. A dent on steel can be straightened out even in the field, whereas a cast wheel most often cracks.
The width of the rim must match the width of the tire. A disc that is too narrow or too wide will change the profile of the rubber, which will negatively affect its mileage and grip properties. Tire manufacturers always indicate a recommended rim width range for each tire model.
- 🛞 Diameter: Must match the tire size (e.g. R17, R20).
- 📏 Departure (ET): Determines how much the wheel protrudes outward or recesses into the arch.
- ⚖️ Load: The maximum load capacity of the disk must exceed the weight per wheel with a margin.
Tire types: from Mud Terrain to Boggers
The choice of tires for large wheels depends on where you plan to ride. For a mixed cycle (city + light off-road), All-Terrain (AT) tires are suitable. They have a moderate tread and provide an acceptable level of noise and comfort on asphalt.
For serious off-road, where real monster truck, Mud Terrain (MT) tires or specialized “mud tires” are used. They are distinguished by an aggressive tread pattern with deep sipes for self-cleaning. However, such tires perform worse on wet asphalt, especially in winter.
The most extreme class is Bogger tires with huge, sparsely spaced lugs. They are designed for clay and bogs, but on hard roads they wear out quickly and can be dangerous due to poor grip. When choosing large diameter tires, pay attention to the speed and load index.
What is a beadlock and do you need one?
A beadlock is a device that mechanically presses the tire bead against the rim. This allows you to reduce tire pressure to 0.2-0.5 atm without the risk of beading, which is critical for passing through sand and swamps. It is often prohibited to use real beadlocks on public roads, so imitations exist.
The influence of wheel size on dynamics and consumption
The installation of large diameter wheels directly affects the gear ratio of the main pair. In effect, you are making the pass "longer". Maina loses traction at the bottom, the engine is forced to work in more intense modes to accelerate, which leads to an increase in fuel consumption.
If the difference in the diameter of the standard and new tires exceeds 3-5%, it is recommended to replace the main pairs in the axles. This will restore lost traction and allow the engine to operate in its optimal rpm range. Without replacing the “guitars” (main pairs), the car will become sluggish and the gearbox will overheat.
The braking system also suffers. Increased wheel weight requires more effective braking. Standard brakes may not be enough, especially when descending a mountain with a full load. In such cases, install larger diameter brakes or switch to more efficient calipers.
Comparison of popular elevator tire sizes
To better understand the size, let's consider popular modernization options. The choice of a specific size depends on the car model and the degree of its preparation.
| Tire size | Required elevator | Type of use | Impact on consumption |
|---|---|---|---|
| 31-32 inches | 0-2 inches | Light offroad, snow | +5-10% |
| 33-34 inches | 2-4 inches | Mixed cycle, dirt | +15-20% |
| 35-37 inches | 4-6 inches | Heavy offroad | +25-30% |
| 38+ inches | 6+ inches | Monster trucks, swamp walkers | +40% and above |
This table is for informational purposes only. Actual lift requirements may vary depending on wheel offset and tire width. Always try on before purchasing a complete set.
Legal aspects and road safety
In Russia and many other countries there are strict restrictions on making changes to the vehicle design. Moving the wheels outside the arches (if they are not covered with mudguards) or exceeding the permissible ground clearance can lead to problems when passing a technical inspection and communicating with traffic police inspectors.
Any major alteration, including a suspension lift and installation of non-standard size wheels, formally requires registration of changes with the State Traffic Safety Inspectorate and obtaining a certificate of conformity of design (SCTS). Ignoring these rules may result in license plates being removed and fines.
⚠️ Attention: The use of studded tires on wheels with a diameter larger than that provided by the manufacturer may be considered a violation if it is not certified for this car model.
Safety comes first. Instability of control at high speeds due to a high center of gravity is a real risk. On monster trucks with huge wheels it is not recommended to reach speeds above 100-110 km/h.
☑️ Check before the first departure
Maintenance and care of large wheels
Large wheels require special attention. Dirt that gets into the arches can damage the wiring or cause corrosion. After each off-road trip, you must thoroughly wash the car, paying attention to the inner surfaces of the arches and suspension elements.
Tire pressure is a critical parameter. On asphalt it should be as recommended, but on sand or dirt it is often reduced. However, driving on flat tires on hard surfaces leads to overheating and destruction of the cord. Always have a booster compressor with you.
Regular balancing of large wheels (every 5-7 thousand km) is mandatory, since imbalance on a large diameter causes strong vibrations and accelerates suspension wear.
Don't forget to check the condition of the wheel bearings. The load on them when installing wide disks with a negative offset increases many times. The appearance of a hum is the first sign of the need for replacement.
How often should large tires be changed?
The service life of Mud Terrain tires on asphalt is an average of 30-40 thousand kilometers. If you drive your car primarily in the city, wear will occur faster due to the soft composition of the rubber. On off-road, the resource depends on the aggressiveness of the route: stones can “eat” the tread in one season.
Is it possible to drive a monster truck in winter?
Yes, you can, but with restrictions. Wide tires “float” in deep snow, but hold up well on compact roads. However, the rubber compound of many off-road tires hardens in extreme cold (below -15°C), making driving dangerous. For harsh winters, it is better to have a separate set of narrow tires.
Do I need to change the steering?
When installing wheels with a diameter of 35+ inches, the steering damper and lugs are often not enough. It is recommended to install a reinforced steering damper and, in some cases, replace the tie rod with a reinforced one in order to avoid “wobble” of the front end.