Tires and shock absorbers play an important part in road grip, and it is road grip that ultimately allows the car to be accelerated and decelerated while also providing predictable handling and stability. As such road grip in an important element in car safety. Upgrading your brakes, for example, is a useless endeavor if your car has little grip due to worn tires or worn shock absorbers. This is obvious as worn tires with low grip may lock up and skid when you apply brakes, and the wheels need to be able to rotate to slow the car down. Similarly when the tires are bouncing through the air when you brake over bumps, road grip is lost and braking becomes ineffective.
A simple safety precaution would be to check your tires' thread depth and tire wear, but on modified cars with extra horse power, the grip provided by standard tires may not be sufficient even if the tires are in good condition. On modified cars you may want to fit larger or wider tires that provide a larger contact area with the road, or low profile tires that have shorter, less flexible sidewalls and provide more precise handling. You may also want to fit a tire that has a higher maximum speed rating and higher load rating. If you do opt for larger or wider tires, you will need to upgrade your shock absorbers (or dampers as they are also called) and possibly your springs to handle the increased unsprung weight.
But first you need to know what tires your car has, what tires are suitable for your car, and the effect of changing your tires.
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