How to read extra tyre markings

Most people know how to read simple tyre markings such as the tyre manufacturer, range name and tyre size. Here you can read more about the standard tyre marking. In addition to these, a tyre may also have other, extra markings, which we will discuss now.  

1. Service conditions

Earthmover tyres have different load carrying abilities than industrial tyres, for example. A difference exists between different applications, either ‘loading’ or ‘transport’. The tyre in this example is especially designed for transport/haulage.

2. Maximum load capacity

This section on the tyre gives more information on how heavily the tyre can be loaded. In this example: up to 15,550 kg (40800 lbs).

3. Inflation pressure

This section gives information about how much pressure there should be in the tyre for optimum usage. In this example: 525kpa (76psi).

4. Maximum speed

At this section, you can read the maximum speed off your tyre. In this example: 50 km/h (30 mph).

5. Load Index/Speed Symbol

The Load Index is an international numerical code for the maximum load a tyre can carry at the speed indicated by it’s speed symbol under service conditions specified by tyre brands. In other words, it is the amount of weight your tyre can support safely. In this example: 209B. Here you can find more Load Index/Speed Symbol data.

6. Star Ratings

Star ratings indicate the strength of the casing and are similar to ply ratings such as bias or radial tyres. The table below can be used as a guide for converting.

Loader/DozerEarthmoverGrader
Tyre SizeStar markPly RatingTyre SizeStar markPly RatingTyre SizeStar markPly Rating
15.5R25★★UPTO16PR17.5R25★★UPTO16PR13.00R24UPTO16PR
17.5R25UPTO16PR20.5R25★★UPTO24PR14.00R24UPTO16PR
20.5R25UPTO24PR23.5R25★★UPTO24PR16.00R24UPTO16PR
23.5R25UPTO24PR26.5R25★★UPTO24PR   
26.5R25UPTO24PR29.5R25★★UPTO28PR   
29.5R25UPTO28PR14.00R25★★UPTO32PR   
   18.00R33★★UPTO40PR   
   21.00R35★★UPTO44PR   
   24.00R35★★UPTO48PR   
   27.00R49★★UPTO54PR   

Do you want get more information or do you have any questions? Do not hesitate to contact us!

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