The Impact of Plus-Sized Wheel/Tire Fitment on Vehicle Stability

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Plus-sizing in the tire industry is the growing practice of replacing a vehicle’s original equipment wheel size with a larger diameter wheel and replacing the tire with a lower aspect ratio tire of the same diameter. This practice is normally associated with aftermarket sales, and there is a growing trend for vehicle dealerships to fit these larger wheels/tires to new cars. This paper discusses the general practice and its effect on some of the performance characteristics of vehicles. A vehicle taken from the NHTSA New Car Assessment Program’s rollover “Star” rating program is used to illustrate the impact of plus sizing on static stability. Some of the dynamic tire effects that could influence vehicle stability are discussed and preliminary testing data on the dynamic impact of plus sizing are presented.

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... Here, RV represents rotational velocity in radians per second, S v represents the speed of the vehicle in miles per hour and R represents the radius of the wheel in meters, not to be confused with the radius of the brake rotor. The radius of the wheel used in this study is based on Daws, J. W., et al. [12] Chevrolet Avalanche wheel radius of 0.389m. Using Equation 1, the calculated rotational velocities from speeds of 25mph, 55mph, and 75mph are 29rad/s, 63rad/s, and 86rad/s respectively. ...
Conference Paper
A non-uniform high-temperature gradient is generated on the surface of brake disc during braking. This temperature gradient induces thermal buckling, a deformation characterized by either a coning mode or potato chip mode. In rotating machinery, vibration occurs with a natural frequency at a certain rotational speed, leading to a change in the contact conditions at the frictional interface. It may cause a redistribution of temperature and thus the thermal buckling modes. Meanwhile, some vibration modes in a brake system can also be excited by the deformation modes of thermal buckling in the rotor. The coupled and uncoupled problems of thermal buckling and vibration are analyzed using an ABAQUS benchmark vented brake model. It is known that different assumptions of temperature, either in the radial or axial direction, may lead to different solutions of thermal buckling. In this study, we assumed some representative temperature profiles in the radial direction, including linear, sinusoidal, and exponential functions, meanwhile, the circumferential distribution of temperature was maintained uniform. The effect of structural vibration on the thermal buckling modes, as well as the effect of buckling modes on vibration in this simplified situation, were both analyzed. Although it is concluded that vibration during braking does not significantly increase the chance of buckling for the ABAQUS benchmark model, the results are highly dependent on the chosen parameters including materials, dimensions, and rotational velocity, and the coupling can be strong in some conditions.
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