Wind and Fire Wheels

S5, E20: Four bladesmiths must rack their brains when they are tasked with forging a signature blade from a bicycle. After major setbacks and time-consuming failures, each smith is pushed to their limit as they race to the finish before the clock hits zero. Ultimately, two smiths advance and are shocked to learn that they must recreate an ancient, mysterious weapon called Wind and Fire Wheels. Whose wheels will keep on turning and earn them $10,000 and the title of Forged in Fire Champion?