"Your friend must host invite only session
- Drive out with an Rebel from your garage.
- Make sure your friend’s BMX is outside your garage.
- Drive a little bit of distance, and drive really fast towards your garage. When driving towards the garage door, the instant you hit the garage door is when you need to spam A.
- Hit pause and go to game store and back out quickly.
- Run to your friends BMX and get on.
You will spawn inside your garage with your friends BMX in the car slot."
Video:
Credit:
http://www.reddit.com/r/gtaglitches/comments/2jrm9q/store_a_bmx_in_car_slot_117/
I would appreciate if someone could help me with this on the Xbox 360!