Instructions and tips for users

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Instructions and tips for users form a constituent part of the Warranty and Complaint Conditions of MITAS Motorcycle and Scooter Tyres and Tubes

 

  • Tyres are the only part of a motorcycle in contact with the road surface. Safety at accelerating, braking, steering and cornering thus depends on a relatively small contact surface between the tyre and the road.  It is of utmost importance that during use tyres are maintained; tyres may only be replaced by the authorised personnel. 
  • Use only dimensions, types and tyre constructions recommended by the motorcycle manufacturer, since incorrect tyre use can have a negative impact on the behaviour of a motorcycle, safety during riding as well as tyre wear and tear.
  • Always read and follow the instructions issued by the motorcycle manufacturer.  
  • The MITAS tyres for motorcycles may only be mounted on motorcycles.  Using these tyres on any other vehicle could be hazardous. For further recommendations with regard to tyre mounting, please contact Mitas a.s. or Savatech d.o.o.. 
  • The surface of a new tyre is very smooth, which is why, we recommend driving carefully for the first 100 km to run it in.   
  • Drive carefully.   Excessive accelerating, braking and cornering significantly reduce the service life of a tyre. 

 INSTRUCTIONS FOR MOUNTING A TYRE

TUBE-TYPE TYRES

 Mounting procedure:

  • When replacing the tyre, use a new tube too.   
  • Make sure that rims are clean and well preserved.
  • Check the condition of the rim and the flap and, if required, change the flap.
  • Slightly inflate the tube.
  • Position the tyre in accordance with the designation ROTATION on the wall-side.
  • Using a special tool mount the tyre (finish at the valve). Use a special emulsion to simplify the mounting procedure.
  • Inflate the tyre up to the pressure of 3.5 Bar and check the position of the tyre bead and the tube. If the position is incorrect, deflate the tube and correct the position of the tube and the tyre bead. Re-inflate the tube until the tyre bead fits in the correct position on the rim.
  • Adjust the tyre pressure up to the value specified by the motorcycle manufacturer. 

Dismounting procedure:

  • Remove the valve insert and completely deflate the tyre.
  • Push both tyre beads from the rim.
  • By means of a special tool remove the tyre from the rim. 

TUBELESS TYRES

Mounting procedure:

  • When replacing the tyre, replace the valve too.   
  • Make sure that rims are clean and well preserved.
  • Apply special emulsion to the rim and the tyre bead. 
  • Position the tyre in accordance with the designation ROTATION on the wall-side.
  • Using a special tool mount the tyre (finish at the valve).
  • Inflate the tyre until the tyre bead correctly fits in the rim seat (it should slide over the TL edge on the rim) and carry on up to the pressure of at least 3.5 Bar to assure that the tyre closely sits on the rim.  (It is recommended to inflate the tyre without a valve insert.)
  • Adjust the tyre pressure up to the value specified by the motorcycle manufacturer. 

Dismounting procedure:

-       Follow the procedure for tube-type tyres.

 INSTRUCTIONS FOR STORING

  • Stored tyres may not be loaded, squeezed or stretched, since this can permanently deform the tyre.
  • In the case of a short-term storage (up to 4 weeks), tyres may be stored in a horizontal position, one on top of one another up to the height of 1.5m but only if a carrying carton in inserted in tyres. 
  • For longer storage periods, tyres should be stored in a vertical position and slightly turned around once per month.   
  • Store tyres at the temperature of below 25°C, even better below 15°C. Deformations are more likely if temperatures are higher. Prevent a direct contact with heat, radiators and hot pipes. Low temperatures can unfavourably affect tyres. Before use, cold tyres are to be warmed up to 25°C.
  • Store tyres in ozone-free spaces (away from electrical motors and other electrical equipment, which can produce sparks and other discharges that can cause or increase the concentration of ozone in the space), and spaces  that are free from oxygen and chemical substances such as fuels, greases, chemicals, acids or disinfectants. 
  • Store tyres away from sharp objects, which could damage rubber surface (sharp metal parts, wooden parts or other sharp objects.

COLOURED TYRES

  • General storing conditions have to be considered at storing coloured tyres. Furthermore, it should be considered that a coloured sidewall is extremely sensitive to dirt and direct exposure to sun light, which is why, tyres should be wrapped-up in foil and stored in a dark space. 

FURTHER INSTRUCTIONS, TIPS AND TECHNICAL INFORMATION

MAINTENANCE OF A TYRE

INFLATION PRESSURE

  • It is of extreme importance that the specified inflation pressure is maintained. Driving with inadequately inflated tyres can be very hazardous.  If tyres are underinflated, the temperature rises, which can result in an abrupt tyre destruction. Tyre pressure can further define the service life of a tyre. A correct inflation pressure ensures the maximum distance travelled along with a satisfactory stability, driving comfort and road grip. Tyre pressure maintains the shape of tyre.
  • Insufficient pressure or incorrect mounting accelerates tyre wear and tear and additionally loads the tyre carcass. 
  • Excessively high pressure can cause tyre wear in the centre of the tyre tread, and increases potential of tyre tread cracks.
  • Inflate tyres to the value specified in the manual for use of motorcycles. 
  • Maintain the specified pressure as a minimum inflation pressure. If driving fast, increase the pressure by 0.2 Bar; if driving with a lot of luggage, increase the inflation pressure in the rear tyre by 0.2 Bar. 
  • Using a calibrated pressure gauge, check the inflation pressure at least once per week when the tyre is cold and always before making a longer trip.
  • Consider the fact that the pressure increases when the tyre is hot, and decreases when the tyre is cold. The pressure can also drop if a valve insert does not fit well or is worn-out. 
  • Check the valve insert, screw it or replace it if required. 
  • Always place the valve cap (screw tightly), which functions as a seal preventing dust from intrusion. 
  • In the case of tubeless tyres, maintain the valve or replace it when mounting a new tyre. 
  • When replacing a tube-type tyre (mounting with a tube), a new tube should be used. Tubes stretch during use. A repeated use of an already stretched and, consequently, thinner tube can increase the chance for a tube puncture and an abrupt pressure loss, which can aggravate the stability of a vehicle and cause a fall.

MOTORCYCLE TYRE

  • Assure a sufficient distance between the individual motorcycle parts (mudguards, forks, transmission chain) and the tyre mounted on the rim.   
  • During rides at higher speeds the outer dimensions of a tyre enlarge as a result of a centrifugal force. The increase can be even larger with a diagonal tyre; therefore, do not change the nominal tyre dimensions.  
  • Due to a danger of a contact between the tyre and the motorcycle parts, and developing uneven wear and tear, make sure that the wheel base is correctly adjusted after transmission chain becomes worn-out.

TYRE AND RIM

  • Suitable flaps have to be used with spoke wheels. Regularly maintain flaps since the protruding spoke head can damage and puncture the tube. 
  • Correctly balance the tyre on the rim and regularly examine it. In Slovenia, the legally specified tread depth amounts to 1 mm (in Germany to 1.6 mm) over at least  ¾ tyre tread width, however , we recommend to replace the tyre earlier, since worn-out tyres  are  more likely to get damaged, and have poorer road grip, particularly on wet surfaces. Damaged tyres can be very dangerous and should be immediately replaced. 
  • Immediately eliminate rocks and nails pushed into the tyre tread, since they can puncture the carcass, cause a failure and, consequently, an accident.  The main benefit of a tubeless tyre is that despite being punctured with a nail, an abrupt pressure drop is not possible. Yet, if a driver is not aware of a tyre failure and continues the ride, the damage can spread and become hazardous. 
  • If the pressure drops, the tyre has to be removed from the rim and inspected, the reason for a pressure drop is to be established prior to any repair.  
  • We strongly advise against any repairs of the tyre shoulder and sidewall area.   
  • Furthermore, we strongly advise against any repairs of the P speed category tyres or higher.  
  • It is not allowed to repeatedly use a damaged TL tyre with a tube.
  • The tyre can behave differently in contact with oil or fat, therefore clean it with a cloth soaked in benzene. 
  • MITAS tyres are manufactured with a minor mass imbalance. To achieve a perfect mass balance of the tyre and rim construction an additional balancing procedure is required for driving at higher speeds.  
  • Motorcycles may be used only with the rims specified by the vehicle manufacturer. The use of suitable rims is of importance for a stable ride and other driving characteristics. If the tyre is mounted on a too narrow or a too wide rim, this can lead to a change in the tyre tread shape, which negatively impacts the driving characteristics in general.

TYRE TREAD WEAR AND TEAR

Different factors can cause an abnormal tyre wear and tear: 

  • Insufficient pressure or overload can deform the surface and result in incorrect wear. It can come to a sudden defect in the carcass as a result of excessive bending and a sudden air release. 
  • High speed, heavy accelerating and braking.
  • The temperature of driving surface (higher temperature results in higher wear).
  • A rough driving surface (the rougher the surface, the higher the wear and, consequently, the shorter the service life).  
  • Mechanical irregularities such as deformed wheels, incorrect brake adjustment, poor-quality shock absorbers, a too large gap between the wheel bearings, etc.
  • Unbalanced rotation mass of the tyre and rim construction. 
  • Incorrect adjustment of the rear wheel when replacing or adjusting the transmission chain. Each rotation of an incorrectly adjusted rear wheel causes additional and uneven wear of the tyre tread surface and has a negative impact on driving characteristics of a vehicle, which can lead to a loss of stability during the ride. 

TECHNICAL INFORMATION

BASIC EXPRESSIONS

  • M/C – tyres for motorcycles for mounting on the rims of motorcycles whose tyre bead seat diameter differs from the rims having the same designation but are used for passenger or commercial /delivery vehicles. 
  • MOPED – tyres constructed for motorcycles which achieve the speed of 50 km/h or less.  
  • MST- tyres for special purpose motorcycles with a wider tyre tread than comparable dimensions with the same designation. 
  • NHS – tyres for motorcycles designed for the off-road rides. Their use on public road surfaces is not allowed. 
  • M+S – tyres designed for the use in mud and snow (winter tyres).
  • PR – designates various versions (load index/inflation pressure) of tyres having the same dimension designation. 
  • REINF – motorcycle tyres for load and inflation pressures exceeding the standard values.
  • TUBELESS – tyres which are specially designed for tubeless mounting on suitable rims. 
  • TUBETYPE – tyres specially designed for mounting with a tube.

TYRE PARTS

Ever since the construction of the first motorcycle, a hundred years ago, special tyres for motorcycles have been designed. The development of tyres has been remarkable through the decades.  We have several types of tyres available, which differ according to their basic construction as well as their appearance.  The appearance and the construction depend on the motorcycle type. Irrespective of the fact whether it is about scooter, enduro or road tyres, they all have the following parts in common:  

  • Tyre tread – the upper tyre part, which contacts the road surface. Tyre tread pattern and rubber compound ensure a grip on the road or off-road as well as water drainage from the tyre.   The grip depends on the rubber compound. As a rule, the tyre made from a softer compound has a better grip and a shorter service life, whereas the tyre made from a harder compound has a worse grip and a longer service life. 
  • Sidewall – it includes all the important data: speed symbol, load index, name of the tyre, manufacturer, country of origin, the ECE homologation number and others. During the ride, the sidewall transmits lateral forces, throttles oscillations and prevents tyre deformations. 
  • Carcass (armature) – is the carrying part of the tyre, it ensures its shape regardless the forces developing during the ride. It can be made of two or more cord layers. Cord can be made of rayon, nylon, polyester or Kevlar, individual parts of the carcass can be steel-reinforced.
  • Tyre bead – provides a close connection with the rim and prevents the tyre on the rim to move. It is made from a wire bead and layers of rubberised cord wrapped around the wire bead.  In this way, the tyre wins a required rigidity in the bead area, controls accelerating and braking forces and transmits them onto the suspension.  In the case of tubeless tyres, the tyre bead prevents a loss in inflation pressure. 

TYRE CONSTRUCTION TYPE

With regard to the carcass type, tyres can be divided in the following categories: 

  • Diagonal tyres – with the longest tradition and most spread in the market. The carcass of a diagonal tyre is composed of two or more textile cord layers (rayon, nylon, polyester), which are crossed at certain angles. Diagonal tyres are the right choice for smaller motorcycles with a lower cubic capacity, scooters and older motorcycles whose chassis is adapted to diagonal tyres. 
  • Diagonal belted tyres are actually diagonal tyres with a reinforced diagonal belt under the tread surface.  These tyres are designated with the B letter (diagonal belted tyres), e.g.  130/90B15. These tyres are ideal for higher cubic capacity motorcycles whose chassis is not adapted to radial tyres and demand for stronger tyres.
  • Radial tyres – have a carcass with a cord layer placed at a 90°angle in driving direction. To stabilise the tyre tread surface, the reinforcement cord belts are placed over the carcass.  Radial tyres are the right choice for motorcycles with higher cubic capacity since they have to transmit strong forces onto the road, which develop at accelerating, braking and cornering.  Radial tyres have many benefits, the most important one being the ability to reach high speeds.  Due to a centrifugal force, the temperature in the tyre increases, which can damage the tyre, aggravate the road grip and increase tread wear. The radial construction eliminated almost all disadvantages of diagonal tyres.  The behaviour of a tyre in limiting conditions is better predictable. 
  • Radial MSB tyres are suitable for very strong and fast motorcycles. MSB – an endless strip is wound under the tyre tread surface in rotational direction and stabilises the tread surface in all driving conditions.

At MITAS, mainly the diagonal construction of tyres is manufactured, however, the development is ever more in favour of radial and diagonal belted tyres.    

SPEED INDEX

The speed index marks the highest allowable speed of a tyre with loads specified in the load index, and in driving conditions as defined by Mitas a.s..
Speeds are listed in the Tyres and tubes for motorcycles, scooters, mopeds and carts at www.mitas-tyres.com,  Scooter,  moped and moto tyres catalogue – Technical information at www.savatech.si  and apply to tyres in good condition, properly inflated, with permissible specific load and mounted on suitable rims. The speeds listed in the table are the highest permissible speeds and should not be considered as the ordinary speeds.


LOAD INDEX

The load index is the numerical code, which stands for the highest tyre load allowed (except for loads at speeds over  210 km/h) at speeds marked with the speed index in the driving conditions as specified by MITAS.   The loads are listed in the Tyres and tubes for motorcycles, scooters, mopeds and carts at www.mitas-tyres.com; Scooter, moped and moto tyres catalogue –Technical information at www.savatech.si.
Worn-out tyres are replaced, make sure that the new tyres are of the exactly the same or higher speed index and of load index as specified by the motorcycle manufacturer. 

Mitas a.s. wishes you a pleasant, safe and comfortable drive with your motorcycle.

 

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