Explained: Ty Gibbs holds on to win NASCAR Cup Series race at Iowa Speedway

Ty Gibbs won the NASCAR Cup Series race Sunday at Iowa Speedway, holding off teammate Christopher Bell.

pole-sitter

The driver who qualifies fastest and starts the race in the first position.

right-side tires

A partial tire change during a pit stop that swaps only the two tires on the car's right side, saving time.

jack

The device pit crews use to lift the car during a pit stop so tires can be changed.

brake rotors

Metal discs in a car's braking system that were replaced on Hamlin's car after practice issues.

top-10 finish

Finishing a race in one of the first ten positions, a common benchmark for driver performance.