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Safety Maintenance

Tire Pressure

Always inflate the tire to the correct pressure. Be sure to check cold inflation pressure frequently, i.e. once a week. Although most motorcyclists love to work on their bikes, many seldom remember to check their bikes tire pressures. Correct pressures are critical for safe handling. Over inflation or extreme tire pressure will impair your riding comfort and decrease the size of the contact patch of the tire with the road. Under inflation or too little air pressure will result in poor handling and the bike will be inclined to “wander”. Improper and insufficient tyre pressure will also cause rapid tire wear, an increase in fuel consumption, lower top speed, and provide less control. Remember to check the inflation pressure of your tires weekly. You will find the correct pressure in the operating manual of the motorcycle. Use METZELER’s information only as reference. Attention: When the recommended pressure has been changed for use off the public highway (race track, off-road), it must be reset to the correct value before riding on the street.

Load capacity and speed rating

Load Capacity and Speed Rating are included in the size description. The load rating of a tire is identified by an index number and must not be exceeded (observe the maximum permitted vehicle weight). The maximum permitted vehicle weight might be exceeded when loading the bike with passenger, panniers, tank bag, etc. for longer trips.

Run-in

For optimum performance, new tyres should be ridden on cautiously for the first 100-200 km. During this run-in period sudden acceleration, heavy braking, and hard cornering must be avoided.

Tread depth

Legally the tire has to be changed accordingly to the national law. METZELER recommends changing tires once the tread depth is below 2mm.

New tyre

When fitting new TT (tube type) tyres, new inner tubes must be fitted. Tubes become stretched in service. If a used tube is fitted in a new tyre, it can crease and fail due to thinning of the tube rubber. When fitting new TL (tubeless) tyres, a new valve should be fitted for safety reasons. Under acceleration and braking, as well as during continuous riding at higher speeds, the centrifugal forces acting on the valve can cause it to bend up to 90°. Therefore, short valves should be used. From tests at speeds above 200 km/h, the centrifugal forces acting on the valve insert become so high, that the preload of the valve spring might not be enough to keep the valve closed. Short valve inserts have a higher preload than long ones. Even better are short inserts with a red Teflon-ring. These have further increased spring preload. Whichever type of valve insert is used, it is very important to carefully tighten the valve cap. METZELER recommends to use only caps with a rubber seal.

METZELER-Tubeless-Tyres may be fitted to Tubetype-Rims, if the following restrictions are kept:

  1. Use only METZELER-tubes
  2. Tubeless tyres fitted with a tube have a max. permitted speed of 230 km/h.
  3. Existing regulations of the vehicle manufacturer must be observed.

Tyre mounting - important information warning

Tyres are only to be used on vehicles for which motorcycle tyres were originally approved by the manufacturer. Any other use can be dangerous. Check if the tyre has directional arrows. If it does, you must mount the tyre so that the arrow points in the direction of rotation. Some METZELER tyres have a red dot on the side wall. This indicates the lightest point, and should be positioned next to the valve. To lubricate the bead, use tyre mounting lubricant or soapy water. To seat the bead: remove the valve stem core and inflate the tyre. For safety reasons do not inflate motorcycle tyres to more than 40 psi (2,8 bar); for scooters tyres do net exceed 150 % of the indicated maximum pressure. Be sure to reinstall the valve stem core and inflate the tyre/tube to the recommended riding pressure. Check the bead control lines for proper seating. If the beads are not properly seated, you will have to deflate the tyres/tubes and repeat the above procedure.

Wheel balancing

Elastic bodies like tyres cannot be manufactured perfectly round and without imbalance. Therefore always balance the wheel after fitting a new tyre. There are two methods: Static and dynamic balancing. Static balancing can be made without the wheel spinning. Dynamic balancing can only be made with a rotating wheel and also measures the deviation of masses in respect to the centre plane of the wheel. METZELER recommends dynamic balancing for rims over 2.5-inch width. 

Wheel alignment

Be sure to align your wheels each time the rear wheel is removed or the chain adjusted. Each revolution of an incorrectly aligned wheel gives addition tread wear, reduces tyre mileage and affects steering and cornering.

 

 

Tyre storage

Store tyres in a cool, dry, dark and moderately ventilated area. The storage temperature should not vary significantly and keep to a level below 25° C / 77° F. Direct contact with pipes and radiators must be avoided. Ozone will accelerate tyre aging, therefore do not store near electric motors or other equipment which may produce sparks or other electrical discharges as this produces a higher concentration of ozone. Contact with oil or gasoline may cause contamination of the rubber compound making the tyre unsuitable for use. Wipe off any oil or gasoline immediately with a clean rag .

Tyre repair

Tubeless tyres: Due to the specific regulations of different national governments, we cannot give a general recommendation regarding tyre repair. Please refer to your distributor for information on your country’s regulations. In case you are allowed to repair a tyre, we recommend that you repair only small punctures which are restricted to the tread area, by using a mushroom head type plug. The repairer is solely responsible for the repair and any instructions given to the user concerning the repaired tyre. Repaired tubeless tyres should never be used with a tube. Tubetype tyres: Tube repair is not permitted. Punctured tubetype tyres must have a new tube fitted. if punctured, in addition to having the replaced, the tyre and the rim have to be inspected by an expert. The puncture in the tyre should be repaired by a local vulcanisation, executed by a tyre repairer, so as to prevent moisture from attacking the tyre casing. The repairer is solely responsible to the user for the repair and any inspection of the repaired tyre.

Regroving

It is not permitted to regrove or cut the tread pattern of motorcycle tyres as this might have a negative effect on performance and safety.

Dynamometer use

Dynamometer measurements place extreme loads on tyres. It is possible that damage, often invisible, can be caused during the testing which could lead to failure later. Motorcycle tyres that have been used on a dynamometer must not be used later on the road. 

Different constructions

We have three distinct construction types: Bias (also called cross-ply) tyres (“-”), bias belted tyres (“B”), and radial tyres (“R”). The tyre’s ability to carry side and peripheral forces differs for each distinct construction type. Therefore, a combination of different construction types can influence the motorcycle’s performance. Only the tyre combinations listed in the motorcycle manufacturers fitment charts are allowed.

 

Different patterns

METZELER offers both front and rear tyres in different profiles and for different types of use, so that the front and rear tyres can compliment each other. For example, it is not permitted to fit a street tyre with an off-road tyre.

Front and rear brand

Using different brands of front and rear tyres simultaneously may cause problems. Regrettably, we cannot test METZELER tyres in combination with all our competitors’ tyres, and therefore, we urge you - for safety reasons - to use METZELER tyres on both the front and rear.

Maps

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