With hands gripped to the wheels of karts capable of cresting 45 miles per hour, up to 12 racers hum around the hairpin turns and straightaways of K1 Speed's indoor track during adrenaline-spiking sprints toward the podium. This brand of excitement can be found at all 15 locations, where racers eschew the fumes and inflammatory skywriting of gas kart exhaust for European, eco-friendly electric karts designed to instantly accelerate out of curves, which are bordered by safety barriers that absorb impacts. To keep everyone in the chase, dialed-down junior karts (available at select locations) safely carry tiny drivers between the height of 48" and 58".