EFX ATV Tires - On Sale Plus Free Shipping. EFX Performance Tires have been at the forefront of engineering the world's best performing offroad tires. We take our designs serious, spending countless hours in the field to ensure that each and every approved tread pattern is the best tire we can produce. Each and every tire design we manufacture has been abused in the mountains of Colorado, flats of California and the backwoods to Texas to ensure that no matter your terrain preference, we have a tread that fits your style. Give us a call to discuss how EFX can improve your machine's performance, safety and stability. Our staff is ready to help you with your purchase. Call us at (813) 769-2451