ADVICE
ADVICE
 STAGE 1Â
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Identify the relevant SRI using the original size.
SRI: «Speed Radius Index» is a parameter used to calculate the theoretical speed of vehicles for homologation procedures in the European Union and for the interchangeability of different TYRE sizes.
step 1
![step 1](https://cxf-prod.azureedge.net/tier-3-production/attachments/ckhljkv4d0txa01ltv97p8qvs-step-1.full.png)
STAGE 2
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Based on the SRI obtained, establish the possible tyre size dimensions.
IMPORTANT :
• In no case does the SRI correspond to a specific tread circumference value. Its use in these tables is purely indicative.  Verification measurements must be taken.
• Any changes mean you must calculate the axle ratios, evaluate weight distributions and check that the rim widths and diameters are compatible  (see technical pages)
step 2
![step 2](https://cxf-prod.azureedge.net/tier-3-production/attachments/ckhljmiz40or301l1hyrpgvxp-step-2.full.png)
Some recommendations:
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Agricultural tyres must be stored in clean conditions in dry, well-ventilated premises, away from direct sunlight.
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They must be kept away from:
- sources of ozone (electric motors, transformers, arc welding stations, etc.),
- any chemical substance, solvent or hydrocarbon likely to alter the nature of the rubber,
- any objects that could pierce the rubber (sharp or pointed metal objects, etc.),
- flames or hot objects.
During storage periods, store agricultural tyres and inner tubes in a way that avoids any damage caused by tension or compression, keep them assembled and inflated if stacked, remove as much ballast as possible from vehicle-mounted tyres, and over-inflate by 0.5 bar (7 psi) in relation to in-service pressures.
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Important
- Never store bare tyres or fully assembled off-vehicle wheels in direct contact with the ground for long periods. You are advised to wear protective gloves when handling tyres.
- Always remove tyres from rims before carrying out any work on them. Never heat, weld or solder a rim or wheel with a tyre fitted.
- Always refer to the Michelin inflation chart to determine the correct pressure for your agricultural tyres. Under-inflation causes the casing to become exaggeratedly misshapen and will shorten the tyre's service life.
- Over-inflation reduces the surface area in contact with the ground, causes a loss of grip, and makes the tyre more sensitive to impacts and cuts.
- If loads are lower than those shown in our pressure/load charts, never inflate to lower than the minimum pressure shown in the tyre datasheets.
tyre markings
![tyre markings](https://cxf-prod.azureedge.net/tier-3-production/attachments/cki9mngd40ogb01mrc2vzsidy-tyre-markings.full.png)
tyre dimensions
![tyre dimensions](https://cxf-prod.azureedge.net/tier-3-production/attachments/cki9mng0z0oj501lrniygrg4x-tyre-dimensions.full.png)
valves and rims
![valves and rims](https://cxf-prod.azureedge.net/tier-3-production/attachments/cki9ncwvh0osb01pmkkvhqa2c-valves-and-rims.full.png)