这可让额外的小自行车框架由后方进行安装(可以使更多的帧之间的房间时，管笼被删除)车后部机架和防止了笼式自行车架损害。

This lets extra small bike frames to be carried by a rear mounted car racks (by allowing more room between the frame tubes when cages are removed) and prevents cage damage by rear type bike carriers.

youdao

这可让额外的小自行车框架由后方进行安装(可以使更多的帧之间的房间时，管笼被删除)车后部机架和防止了笼式自行车架损害。

This lets extra small bike frames to be carried by a rear mounted car racks (by allowing more room between the frame tubes when cages are removed) and prevents cage damage by rear type bike carriers.

youdao