OTR tyres can account for up to 20% of operating costs. So correct tyre application is essential.
Key points to consider are:
Some operations with long haul cycles require more heat resistant tyres. Conditions of sharp rock need extra deep
tread to minimize cutting, whereas soft/muddy conditions need higher traction tyres.
- Tyre size and loads carried
- Haul road conditions
- Condition of loading and dumping areas
- Haul length
- Number of haul cycles per working shift
- Machine manufacturer's fitment possibilities
- Site maintenance and service facilities
Most modern machines are equipped with radial tyres which offer the following:
Although the general trend is towards radial construction tyres, there are still applications where
crossply perform better such as shot rock areas, underground mining and very soft sand.
- Longer tyre life
- Resistance to cuts, punctures and tearing
- Good traction
- Better handling and fuel consumption
- Reduced operating costs
- Run cooler than crossply tyres
- Better flotation giving lower rolling resistance and reduced fuel costs
TMPH is a system to establish the working capacity of earthmover tyres. It complements normal load and inflation data tables and is an
important tool in selecting the correct tyre. Once the TMPH requirement has been calculated then the tyre manufacturer is
contacted for established TMPH ratings for tyre sizes and types for the machine involved.
continued page 2