There may be a big-hearted biker buried in the teen pop sensation Justin Bieber as he continues his star-studded charity work by auctioning off his custom motorcycle.

On the auction block is a three wheeled purple customized Campagna T-Rex. The customized purple motorcycle is designed with Justin Bieber’s initials ‘JB’ on its hood.

The funds raised from the charity would be donated to The Rob Dyrdek Foundation and used to design and construct skateboarding parks throughout the country.

The auction hopes to raise $50,000 from Bieber’s ride.

But this isn’t the only charitable thing the young singing star has done. Recently, he announced that he would donate $1 to charity for every copy sold of his upcoming Christmas album ‘Under the Mistletoe’.

Beiber famously auctioned locks of his hair, his shoes, jackets and many of his belongings, all to raise funds for charity.

For riders interested in the three wheeled purple customized Campagna T-Rex, a bid can be placed here but hurry, the motorcycle goes to the highest bidder as of 4PM EST on October 27, 2011.