Technical Regulations
Technical specifications for the Indianapolis 500 are currently specified by IndyCar. Rules are the same as every other IndyCar race except for special low-drag adjustable "Speedway" wings that are only used for the Indy 500. In the past, especially during the years when USAC sanctioned the race but CART was the dominant sanctioning body, rules between the race and the sanctioning body differed at times, resulting in chassis and engines being legal for Indy, yet not being legal for other events that season. The most famous manifestation of that disparity was the Ilmor-built Mercedes-Benz 500I engine fielded by Roger Penske in 1994.
Teams may enter up to two machines under a given car number - the "primary" car and a "backup" car. The backup car is identified by the letter "T". For example the two cars for the #2 team would be numbered #2 and #2T. Both cars may be practiced during the month, or even simultaneously. It is not uncommon for teams to prefer their backup car, if it is deemed faster, or for other strategic reasons. Additionally, as the month wears on, a "T car" may be split off into its own entry, and re-assigned a new number, or be sold to another team.
All cars must pass a rigorous technical inspection before receiving a sticker signifying that the car is eligible to practice. Various criteria includes minimum weight, dimensions, and approved parts, particularly safety equipment. Prior to and following qualification attempts, cars must pass another inspection. The first inspection is focused on safety aspects while the second is largely to detect deviations from the performance guidelines set forth by the league.
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