Advances in motorcycle technology over the last few decades has led to the development of a wide range of motorcycle tires that all are made from the same basic parts:
- Tire tread is the upper part of the tire that contacts with the road surface. The combination of tire tread pattern and rubber compound ensures sufficient grip on-road or off-road as well as water dispersion from tread grooves. Road grip depends on the rubber compound. As a rule, a tire made from a softer compound has more grip but a shorter service life, whereas a tire made from a harder one has less grip but a longer service life.
- Sidewall connects the tread area to the rim area and is also where data is engraved with: size, speed symbol, load index, pattern name, manufacturer name, country of origin, ECE homologation number and others. During use the sidewall transmits lateral forces, dampens oscillations and prevents tire deformations.
- Carcass plies are the supporting structure of the tire that help retain its shape irrespective of the forces generated during the ride. They consist of two or more cord layers of rayon, nylon, polyester, kevlar, steel and other relevant materials.
- Tire bead which consists of a wire bead and layers of rubberized cord that holds the tire onto the rim and prevents it from moving. The bead provides rigidity to the tire and controls acceleration and braking forces while transmitting them to the suspension. On tubeless tires, the tire bead also prevents loss of air pressure.
TYPES OF TIRE CONSTRUCTION
There are three types of tire carcass construction:
- Diagonal tires otherwise called Bias and are the most common in use. The carcass plies of a diagonal tire combine two or more textile cord layers that overlayed at determined angles. These tires are commonly used on motorcycles with a lower cubic capacity, scooters, and classic.
- Diagonal-belted tires are similar to Diagonal tires with a reinforced diagonal belt under the tread surface. These tires are marked with the B letter in the size description: e.g. 130/90B15. Best suited to heavy high cubic capacity motorcycles and poor road conditions.
- Radial tires have carcass plies with a cord layer layed at steep angles towards the riding direction with reinforcement belts placed across the carcass plies in order to stabilize the tread surface. Steel cord-reinforced radial tires come with an additional steel cord under the tread surface. Radial tires are particularly suited for high speed motorcycles that generate strong acceleration, deceleration and cornering.
SPEED / LOAD INDEX
The speed index indicates the highest permissible tire speed under the marked Load index (see below), while the load index indicates the maximum permissible tire load applicable. Permissible speed/load indices for each tire are listed in the catalogues and in www.mitas-moto.com. These speed and load indications apply to tires in good condition, properly inflated and mounted on suitable rims. When replacing worn-out tires, make sure the speed and load indices of the new tires correspond to the values specified by the motorcycle manufacturer.
TYPES OF TUBES
Mitas normal and heavy-duty tubes for motorcycles, scooters, and mopeds are made from a high-quality butyl compound, while the ultra heavy-duty tubes are made from natural rubber. Mitas tubes are from 1.2 to 2.0 mm thick, whereas the ultra heavy-duty tubes are up to 4 mm thick. The TR4, TR6, or JS87 valve stems are fully threaded and have a ring-shaped base. Metal valve cap with a rubber seal prevents dust from getting into the valve. All our tubes are packed in boxes.