Robin Williams' wheels attracted some high rollin' cycling fans -- including one who paid more than $40,000 for just one of Robin's favorite bikes!
Robin's kids donated 87 of his high-end bicycles -- some custom-made -- for an online auction that closed Tuesday. One lucky bidder even scored a replica of a 10-speed Robin's pal, Lance Armstrong, rode in the Tour de France.
We know, and yes ... it works without steroids.
We're told the auction, hosted by Paddle8, drew bids from 25 countries and raised more than $600k. Robin's Master Pista, La Carrera with a custom design from artist Futura 2000 was the biggest ticket item ... going for over $40k.
All the money raised is going to the Challenged Athletes Foundation and the Reeve Foundation -- 2 of Robin's favorites.