Bicycle wheel positioning device

Bicycle wheel positioning device comprising:

• a case (1) including a back board (12), two first boards (13) and two second boards (14), the two first boards (13) respectively extending from a top and a bottom of the back board (12), the two second boards (14) respectively extending from two ends of the back board (12) and connected to the two first boards (13), a room (11) formed between the back board (12), the two first boards (13) and the two second boards (14), the case (1) including an opening (15) formed to a front of the case (1) and communicating with the room (11), each of the two first boards (13) including a recess (131) which communicates with the opening (15) and the room (11), and
• two positioning units (2) respectively connected to the two second boards (14), each positioning unit (2) including a roller unit (21) and at least one spring (24), the two respective roller units (21) located in the room (11), when a force is applied to the two roller units (21) in a direction toward the two roller units (21), the at least one spring (24) of each roller unit (21) is compressed and the two roller units (21) are resiliently moved away from each other, when the force is removed, the at least one spring (24) of each roller unit (21) rebounds and the two roller units (21) move toward each other, each of the positioning units (2) including a frame (25) and the roller unit (21), the roller unit (21) including a pivot (22) and a roller (23), the Divot (22) extending through the roller (23), the frame (25) including a base (252) and two wines (253) respectively formed to two ends of the base (252), two ends of the pivot (22) respectively and rotatably connected to the two wines (253), at least one of the wines (253) including a chamber (2531), the at least one spring (24) located in the chamber (2531) and contacting the pivot (22).