Caitlyn Jenner mastered winning races with her legs ... and now, the Olympic gold medalist is literally shifting gears -- launching the "Jenner Racing" team.
TMZ Sports has learned the 72-year-old 1976 Olympic Decathlon champ's team will race in the W Series this season ... starting in May.
FYI, the W Series is an "international single-seater motor racing championship for female drivers."
Jenner is no stranger to motorsports.