The British actor has splashed out on a 2010 Felt Breed Cyclo-X off-road cycle and has been spotted riding around Baton Rouge, Louisiana, where he is currently filing `The Twilight Saga: Breaking Dawn`.
One onlooker said: "He was by himself on his bike for a good portion of yesterday.
"He looked to be having a good time and he was even trying to do tricks with it. He was riding pretty fast at some points too."
According to the manager of Capitol Cyclery, the 24-year-old star told staff he "didn`t want a mountain bike" and "wanted something simple".
Robert impressed workers with his down-to-earth attitude.
The store`s manager told HollywoodLife.com: "He didn`t strike me as a movie star when he walked in the door."
As well as buying a new bike, it was recently claimed the `Remember Me` star is planning to spend £30,000 on a Halloween party.
A source said: "Rob`s organising a huge soiree to celebrate Halloween, he thinks it is going to be hilarious for the cast and crew to dress up in scary costumes.
"The crew are huge fans of Rob and are really looking forward to it. Rob knows how much they all love Halloween so has really gone to town.
"He`s asked a couple of costume designers he knows to make special ghoul costumes for his guests."