Justin Bieber is auctioning a customised motorcycle for charity. The 'Never Say Never singer is offering his customised Campagna T-Rex to the website Charity Buzz in hopes of raising $50,000 (31,911). The purple three-wheeled motorcycle is decked out with Biebers initials 'JB painted on the hood. All money raised from the auction will help The Rob Dyrdek Foundation design and construct skateboarding parks all across the country. Bidding will close at 4pm ET on October 27. Bieber has premiered his new single 'Mistletoe, which will be featured on his upcoming holiday album Under The Mistletoe. He will also perform in Times Square alongside Lady GaGa on the 40th annual Dick Clarks New Years Rockin Eve with Ryan Seacrest. DS