f638226b_up_racing__washingtonpost_com___Shock_absorbers
[Track types] Setup descriptions [Wedge] Less (loose) More (tight) Wedge is the percentage of weight carried on the right front and left rear wheels. More wedge means more weight on those two wheels, making the car tighter (harder to turn). Typical pit-stop tweak: 20-40 lbs. (1-2 rounds of a ratchet) [Track bar] High (loose) Low (tight) The track bar is a rod connecting the rear axle to the chassis. Lowering the track bar gives the rear axle more grip and makes the car tighter. Only the right side is adjusted during a race, with a ratchet through a hole in the back window. Typical pit-stop tweak: 1/2 inch (two rounds) or less [Nose weight] Back (loose) Front (tight) Part of a car's minimum weight (3,450 pounds) consists of 35-pound tungsten blocks lined up in the hollow frame rails, along with a few nearly weightless aluminum spacers. Adding weight to the nose, which makes a car tighter, is as simple as moving the blocks to the front and spacers to the back. [Brakes] Light Heavy Brakes come in different sizes and weights, and teams choose based on how much braking a particular track requires. Brake bias, adjusted by a knob in the cockpit, controls how much braking force goes to the front brakes vs. the back. [Camber] Less lean More lean Camber is the angle of the wheels. The right tires lean in and the left ones lean out for more grip in the turns. The angle provides grip, but it also causes friction on tire edges, so teams use as much camber as they can without wearing out the tires. NASCAR rules restrict camber as well. [Springs] Soft Stiff Springs are measured by the weight required to compress them one inch, and the range is 100 to 3,000 pounds. Right-side springs are typically stiffer than those on the left. NASCAR hands out the back springs on superspeedways. [Shock absorbers] 
Soft Stiff Shocks must strike a balance between responsiveness and bounce. Softer shocks cushion bumps (think of the smooth ride in an old Coupe deVille); stiffer shocks make the car more responsive (think of the squishy handling in that Caddy).
Setting up to succeed at Sprint Cup racing (washingtonpost.com)
Shock absorbers