Just over two years after his tragic death, Robin Williams' beloved bicycle collection is set to be auctioned off by his family.

The late actor's bicycles are being auctioned off to benefit the Challenged Athletes Foundation and the Christopher and Dana Reeve Foundation. Online auction site Paddle8.com will be hosting the auction , according to PR Newswire.

Williams was known for many philanthropic efforts and served as an ambassador to both the CAF and Christopher and Dana Reeve Foundations. His children Zak, Zelda and Cody hope to now continue their father's mission through this auction.

"Though bright, skin-tight spandex still remains one of the more embarrassing outfits to regularly witness your Dad wearing growing up, the sport of biking and the people Dad helped through his love of it will always hold a special place in the hearts of our family...We hope these bikes will bring their new owners as much joy as riding them, and helping these causes, always brought him. And though not required, may we suggest wearing the loudest, most vibrant and brightly-patterned, skintight biking gear possible when riding them?"

Among the bicycles being sold are a Waterford R33, a Van Dessel Country Road Bob and a Casati Sphera. The auction website also features a tribute to Williams from Conan O'Brien. The auction closes on Oct. 25.