f638226b_up_racing__washingtonpost_com___Shock_absorbers
[Track types] SUPERSPEEDWAY Daytona Talladega (Ala.) [Wedge] Loosest Typical wedge is 48 percent, making for the loosest, freest setup of any track type. [Track bar] Highest The track bar is typically as high as NASCAR rules allow: 15 inches. [Nose weight] Back Teams try to even out the car so that half the weight is in the front and half in the back. Because engines skew weight to the front, weight blocks will be moved toward the back. [Brakes] Light brakes / balanced Teams use the lightest, smallest brakes on superspeedways because the only time the driver needs them is when he comes into the pits (or to keep from ramming another car while drafting). Brake bias is set right in the middle so all four tires brake simultaneously. [Camber] Straight Very little camber is used because grip is not an issue and tire wear would require pitting early. [Springs] Varies The stiffest front springs are typical on the rough Daytona surface to keep vertical force from pushing the car's nose into the track. Fairly soft front springs are used at super-smooth Talladega to keep the splitter  the horizontal plate that sticks out from below the front bumper  as close to the track as possible. [Shock absorbers] 
Varies Rear springs are handed out by NASCAR for superspeedways. Teams use stiff shocks on Talladega's smooth surface and softer ones at bumpier Daytona, which hasn't been repaved since 1978.
Setting up to succeed at Sprint Cup racing (washingtonpost.com)
Shock absorbers