f638226b_up_racing__washingtonpost_com___Shock_absorbers
[Track types] SMOOTH INTERMEDIATE Charlotte Darlington (S.C.) Las Vegas [Wedge] Loose Cars are set up freer on a smooth surface because the track has so much grip already that too much wedge would make the car difficult to turn. [Track bar] Middle The track bar is set looser at smooth tracks than at rough ones, although not as loosely as on superspeedways. [Nose weight] Middle Weights are generally in the middle on a smooth intermediate oval. [Brakes] Light brakes / front Brakes are small and light. Only superspeedways require less braking. Brake bias is set so that the front brakes have more force than the back ones. [Camber] Straight Little camber is used because the sustained high speed would wreck the tires. [Springs] Stiff At Charlotte, Las Vegas and Darlington, speeds are so high that the car bears extra load in the turns and need stiff springs to keep the splitter close to the track without hitting it. [Shock absorbers] 
Stiff Stiff shocks are required to hold the car's body in the best aerodynamic position.
Setting up to succeed at Sprint Cup racing (washingtonpost.com)
Shock absorbers