Optimal tire performance requires correct inflation.  Tire pressure can change over time due to climate changes, natural air loss, or other factors.  To maintain proper inflation, you should check your tires periodically.  Underinflation of tires can lead to early or uneven wear, traction problems, and stability problems.

 

Even with aftermarket tires, the best indicator of correct tire pressure is your vehicle's manual.  Generally, tire pressure should be checked monthly.