This manuscript develops a practical climate road wear index for the evaluation of automotive tire degradation under variable road and weather conditions. The article is prepared in the IMRAD structure for a diploma project in the field of energy machinery and vehicle operation. The purpose is to transform qualitative observations such as hot pavement, wet road, rough asphalt, dust, pressure deviation, route type, and vehicle load into a structured index that can support tire wear assessment, preventive maintenance, and service life prediction. The method integrates tread depth monitoring, route classification, pavement temperature measurement, road surface scoring, and correction factors for pressure and load. A calculation scenario demonstrates how the index can identify high severity periods and road sections that accelerate tread loss. The results indicate that tire degradation becomes critical when hot pavement, rough texture, frequent braking, and pressure deviation act together. The index is not proposed as a substitute for standardized laboratory wear testing. It is proposed as a field oriented tool that allows students and engineers to compare operating conditions and to explain why the same tire can show different wear intensity on different routes and in different seasons. The article concludes that a climate road wear index can make tire maintenance more predictive and can support safer and more economical vehicle operation.

Keywords are tire degradation, climate road wear index, tread depth, pavement temperature, tire pressure, road roughness, preventive maintenance, vehicle safety.

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