1. Introduction: We recommend that you follow the safety and use guidelines provided below.
These guidelines apply upon satisfaction of any more stringent regulatory requirements, developed or prescribed by competition, raid or circuit organizers with respect to tyres.
Non-compliance with these guidelines or operating procedures can lead to improper equipment or mounting and cause premature tyre wear and tear.
The use of circuits with high banking in the turns imposes specific tyres and/or operating conditions. Prior to any use contact the Michelin technical department within the Circuit business: phone: +33(0)4 73 30 13 03. Information is available on our websites (www.michelinsport.com & michelinclassic.com)
2. Recommendations: Before-use checklist
- Tyre selection must correspond to vehicle equipment, as defined by the vehicle maker and manufacturer.
- Make sure that all tyres on the same axle are of the same type (brand, commercial name or industrial reference, dimensions, structure).
Prior to mounting make sure that:
- the diameter of the rim corresponds exactly to the inside diameter of the tyre.
- the width of the rim corresponds to that recommended by the manufacturer or, failing that, to the standards cited (ETRTO, TRA, JATMA, etc.)
- the rim type (tubeless, tube type) corresponds to the type of tyre.
- the rim is in good condition and does not present wear-and-tear (cracks, deformation, etc.) and the valves are in proper condition and if not, have them replaced.
- the tyres have not been repaired and the valves are in proper condition and if not, have them replaced
- Follow the instructions for use provided by the manufacturers (adjustment and compatibility with the rim, type of alloys, geometry).
- Routinely screw down the valve cap It protects the valve mechanism and ensures the complete sealing of the tyre assembly.
- Make sure that the valve is in good condition (no ovalization, no impact trace, etc.).
- Regularly check torque settings of screwed-in valves.
4. Tyre assembly and disassembly
Tyre assembly, disassembly, topping and balancing must be done on suitable good-condition equipment entrusted with qualified and trained personnel that would ensure, among other things:
- Compliance with the manufacturer and legal rules in the selection of tyres.
- Preliminary examination of the outside and inside aspect of the tyre by the installer.
- Compliance with tyre assembly, disassembly, balancing and toping procedures.
- Proper positioning of the tyre on the vehicle (left, right, front, rear).
- Proper working pressure.
Measuring equipment such as pressure gauges, dynamometric keys must be standardized and inspected at least once a year by a certified body or, failing that, by the supplier or manufacturer.
Assembly - Disassembly:
- Make sure that all assembly equipment is suitable for the type of assembly. For how to use this equipment, refer to the manufacturer’s user guide. Comply with the direction of assembly for directional tyres.
- Lubricate the tyre rim seats and beads with a suitable product.
- For tube type assemblies (with an air tube), the dimension of the air tube must correspond to that of the tyre (section and diameter) and the rim must be in a condition that can accept the air tube without damaging it.
- Important note: only use topping installations intended for that purpose. Under no circumstances can the operator remain in the immediate proximity of a tyre assembly. Therefore, make sure that the compressed air hose attached to the valve is equipped with a safety clip and that it is sufficiently long for the operator to be situated outside of the trajectory of flying particles, if any, in case of an incident. Remove people not involved in the inflate procedure from the location in which it is performed.
- Remove the inside of the valve, start topping and check that tyre beads are properly centered with respect to the rim flange.
- If the tyre beads are not properly centered, let the air out and start the entyre procedure over including the lubrication step.
- Continue to inflate until 3.5 bars in order to obtain a good placement of the tyre beads. For higher pressure, use a safety cage during tyre inflation.
- Replace the inside of the valve and adjust it to working pressure. Replace the cap to ensure complete sealing.
- Balancing the four tyres is recommended for use on a circuit.
- The balancing machines must be standardized in accordance with manufacturers’ recommendations.
- Specific attention must be given to the devices (cone / screw board) used for centering the assembly on the machine.
5. Tyre regrooving
- Regrooving changes the characteristics and performance of tyres. This procedure requires the use of appropriate equipment and tools and compliance with instructions. Prior to any regrooving procedure, contact Michelin’s technical departments: Rally: Phone. +33(0)4 73 30 44 45 - Circuit: Phone. +33(0)4 73 30 13 30
- Reminder: regrooving or tread deepening of ECE R30 certified tyres, i.e. those designed for use on public roads, is prohibited.
- In order to preserve the characteristics and properties of tyres, there are some important rules to be observed during storage. The following should be avoided:
- Direct and prolonged exposure to sunlight, sources of high heat and humidity, long-term storage in stacks, the presence of solvents, lubricants, fuel and other chemical products.
- Equipment causing ozone emission (transformers, welding units, electric motors, etc.).
- The storage space must be dry, well-ventilated, without direct light and reserved for tyres. Racks suitable for storing tyres vertically should be used to avoid exercising pressure on the carcasses.
7. Tyre aging
- Tyres age even when not used or if they are only used occasionally; excessive aging of tyres may lead to loss of grip.
- Remove from usage tyres presenting clear signs of aging or fatigue (cracking of the rubber of the outer tread, of the shoulder, of the bead side, deformation, etc.). When in doubt, contact a tyre professional.
8. Monitoring and maintenance
- Check tyre pressure prior to any run and adjust pressure if it does not correspond to the recommended working pressure. Tyre pressure must be checked they are cold (the tyres have not been driven, they have not been warmed)
- Inflating tyres with nitrogen does not exempt you from having to check tyre pressure routinely.
- In case of unusual loss of pressure, check the outside and inside condition of the tyre as well as the condition of the wheel and of the valve.
- Any visible perforation, cut or deformation must be checked in-depth by a tyre professional. Never use damaged tyres or tyres that have run flat without the help of a professional.
- Never treat the rubber of the outer tread chemically.
- Never use tyres with unknown past.
- Make sure that the pressure, camber angle, speed and axle load values are those recommended by Michelin for the intended use (check recommendations depending on use).
Prior to any use, contact Michelin’s technical departments: Rally: Phone. +33(0)4 73 30 44 45 - Circuit: +33(0)4 73 30 13 30 - Historical Competition: +33(0)4 73 41 75 00