Analysis of Car Body and Wheel Geometry Depending on Mileage on the Wear of Tyres in Passenger Cars

This paper analyses changes in body geometry and related wheel geometry which may affect the wear of passenger car tyres. By means of an electronic device, changes were measured in the position of the spots that best reflect the changes of the body geometry. This included the front bench attachment, front suspension and rear suspension, at the beginning of the front stringers, at the end of the rear stringers, around the bulkhead, as well as the top mounting points of the McPherson struts. Changes were also identified in geometrical values for the suspension and steering system. The analysed parameters of wheel geometry included, among others, toe-in, inclination angles for all the wheels, camber and castors for front wheels, etc. Tire wear was characterized by the tyre tread size in the inner, middle and outer parts of all four vehicle wheels. Based on the results obtained, quantitative relationships were identified between the mileage of the vehicle, changes in the body geometry, changes in the suspension and steering system geometry, tyre wear and the coefficient of non-uniformity in tyre wear. It was concluded that changes in car body geometry were strictly correlated with vehicle mileage. These changes, in turn, directly influenced changes in wheel geometry which, apart from influencing vehicle safety, also contribute to excessive tyre wear.

Automated summary

This paper examines the impact of changes in body geometry and wheel geometry on passenger car tire wear. It was found that changes in body geometry directly influenced changes in wheel geometry, leading to excessive tire wear.