Patent ID: 7581795

Claim:
A bicycle frame, comprising: a mandrel having two opposite ends each having an inner side formed with a first threaded section and an outer side formed with a second threaded section having a threading direction different from that of the first threaded section; a hub and freewheel assembly rotatably mounted on the mandrel and having two opposite ends each formed with a bearing hole to receive at least one bearing; two first locking nuts each screwed onto the respective first threaded section of the mandrel and each rested on and contacting with the respective bearing; two fork end members each having a distal end mounted on the mandrel and each rested on the respective first locking nut; two second locking nuts each screwed onto the respective second threaded section of the mandrel and each rested on and contacting with the respective fork end member; wherein the first threaded section of the mandrel is located between the hub and freewheel assembly and the second threaded section of the mandrel; each of the fork end members is mounted on the second threaded section of the mandrel.