Commercial vehicle tires
In contrast to car tires , commercial vehicle tires are larger and wider, i.e. That is, they have a larger tire cross-section and thus a wider contact area. Tires for commercial vehicles can be re-cut from a certain dimension, which means cutting a deeper profile. Tires that allow this are labeled Regroovable . In addition, commercial vehicle tires - provided that the carcass is not damaged - are generally retreaded .
properties
Thanks to a stronger carcass , commercial vehicle tires can withstand higher loads. A car tire normally has a load capacity of approx. 400 kg to 800 kg, while a truck tire can achieve a load capacity of up to 6000 kg. A distinction is made between single and double tires, with the load capacity value for single tires being significantly higher than for double tires - depending on the air pressure . The actual load capacity depends on the respective load capacity index . A load index of 150 means at max. Tire pressure for twin tires on the rear axle - regardless of the tire size - e.g. B. a load capacity of 13,400 kg.
Typical truck tires on a truck (18 t)
- VA 315/80 R 22.5 single tires, load capacity 8,000 kg
- HA 315/80 R 22.5 double tires, load capacity 13,400 kg
or
- VA 385/55 R 22.5 single tires, load capacity 9,000 kg
- HA 315/70 R 22.5 double tires, load capacity 13,400 kg
The so-called super-single tires on the rear axles of semitrailer tractors are special tires. The usual twin tires are dispensed with and an extremely wide single tire is used instead. The main advantages are a lower system weight and reduced rolling resistance. Super-single tires can be equipped with special run-flat elements that make it possible to cover a shorter distance with a flat tire - even when fully loaded. However, according to an investigation by the European Union (COST 334), the super-single tires result in a significantly higher load on the road surface. Due to the higher system costs and lower mileage compared to twin tires, the super-single tire has not been widely used up to now.
Super single tires for trucks (18 t)
- VA 385/55 R 22.5 single tires, load capacity 9,000 kg
- HA 495/45 R 22.5 single tires, load capacity 11,600 kg
Noise limit values and rolling resistance coefficients
Limit values for rolling noise and rolling resistance coefficients according to EU Regulation No. 661/2009:
| class | Tire width in mm | Noise limit in dB (A) | Rolling resistance coefficient (max.) In kg / t |
|---|---|---|---|
| C2 (light commercial vehicles) | no information | 72 * (73) | 9.0 |
| C3 (heavy commercial vehicles) | no information | 73 * (75) | 6.5 |
- Normal tires, traction tires ()
Intended use
Commercial vehicle tires differ greatly from the intended use. For trucks in particular, there are a large number of different types of tires that are designed for special applications. In general, one differentiates the tires according to the axle position in:
- Steering axle
- Drive axle
- Trailer / trailer
- Lift axle
and in particular according to:
- Asphalt or construction site use
- All-round tires for all-wheel drive vehicles
- Regional or long-distance transport use
- City bus tires with reinforced sidewall (to avoid damage to the curb)
- Military / off-road use
- Winter tires with a lamellar structure. These winter tires for alpine use have a silica tread compound similar to that of car winter tires, which becomes softer in the cold and soaks for optimal snow grip. There are also so-called hybrid tires, which are used as "winter tires" in autumn. You lose one of two profile layers over winter operation. Underneath is a new summer profile layer.
Commercial vehicle tires also have a different rubber compound than car tires. These tires are used in vehicles such as trucks and buses . For construction machinery such as B. excavators and wheel loaders , as well as tractors , there are also special tires.
Trim tires
Every tire marked REGROOVABLE (regroovable) has a particularly high basic rubber thickness and can be regrooved up to twice. A sufficient remaining tread depth is a prerequisite for regrooving tires. A truck tire can be trimmed with a heated tire tread cutter in width by up to 23 mm and in depth by up to 12 mm.
The regrooving of tires was in the motorsport sector and is especially common in the truck sector. Depending on the type of tire and the area of use, the mileage can be increased by up to 30%. In addition, recut tires can achieve fuel savings of approx. 5% due to lower rolling resistance . The tire can also be retreaded after regrooving.
When bus and coach with 100 km / h approval does not shaved tires may be used on the steering axle.
Web links
Individual evidence
- ↑ REGULATION (EC) No. 661/2009 (PDF)
- ↑ rillfit.de (accessed June 14, 2014)
- ↑ rillfit.de ( Memento of the original from July 14, 2014 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Blades (accessed June 14, 2014)
- ↑ conti-online.com Tire Basics (accessed on June 14, 2014)
