 For road/street events, there are unique primary and alternative specifications for dry conditions, along with specially designed rain tires for wet conditions.For oval racing, a single set of specifications is used, based upon the configuration and speed of the track, as well as having the right rear tire diameter constructed to be slightly larger than the left rear, (also known as stagger) to aid in high speed corning.The suspension of all IndyCar Series cars is double A-arm, pushrod, with third spring and anti-roll bar configuration multilink.