Tyre specifications are written on the sidewall which needs to be deciphered to know exactly what it means. The information given on the sidewall of the tyre is as follows:
1. Width- Cross Section width of the tyre (always in mm).
2. Profile- Aspect Ration (%age of the Cross section width).
3. Diameter- Rim Diameter (always in inches).
4. Load- Load Index.
5. Speed- Speed Rating.
1. Width- Cross Section width of the tyre (always in mm).
2. Profile- Aspect Ration (%age of the Cross section width).
3. Diameter- Rim Diameter (always in inches).
4. Load- Load Index.
5. Speed- Speed Rating.
The load Index corresponds to the load capacity given in the diagram below. That shows the load bearing capacity of the tyre. The diagram given below depicts the LI of the tyres.
The speed category is designated by the alphabets as given in the diagram below. 
If there is any clarification needed then you can please ask questions in the comment box. We shall discuss all aspects related to tyres. If you want information on a specific topic, then please let me know. We shall take it up soon.
are racing car tyres pneumatic or they solid?
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