Flat spotting can be temporary (the tire will round out as driving warms it up) or in the most severe cases, permanent (in which the tire's ride quality is effectively destroyed). A flat-spot's severity is often a function of the tire size, internal structure, load, ambient temperature, roughness of the ground and time spent stationary.
Low aspect ratio tires have less sidewall flex due to their short sidewalls and much of their load carrying capacity is absorbed by the deflection of their wide footprints.
The tread compounds and firm, nylon reinforced internal constructions used on high performance and high speed-rated tires are more susceptible to flat spotting.
Heavy loads and too little air pressure in the tires (under inflation) will allow them to deflect more where they come into contact with the ground. This allows even more deflection, increasing the severity of the flat spotting.
Cold ambient temperatures make rubber compounds stiffer, increasing their tendency to flat spot.
Rough surfaces make a print on tires even if the car was parked for short periods.
The longer tires remain stationary, the better they remember the position in which they were last parked. Tires on vehicles stored on the ground for many months can be permanently flat-spotted.
While there is no way to completely avoid tire flat-spotting, except using a very well researched and proven material like the ones used by ALTairEGO.
ALTairEGO have a wide range of specialty products designed to suit your car, from classic, sports, supercar, truck to heavy weight.