Atomic is a tire company featured in Grand Theft Auto: San Andreas, Grand Theft Auto IV and Grand Theft Auto V.
It's based on the real-world company Goodyear where tires is their specialty.
GTA San Andreas
TransFender and Wheel Arch Angels offer Atomic brand custom rims. Wheel Arch Angels also offers an Atomic-themed paint job for the Flash.
GTA IV
In GTA IV, they make all of the car tires in the game and some of the headlights.
GTA V
Atomic serves the same purpose as it did in GTA IV but now they have their very own sponsorship blimp in the sky advertising their products.
Pre-ordering GTA V will grant access to the Atomic Blimp via a phone call to Atomic. There is a Atomic store in Davis.