What is considered the safest way to install a chain on a chain drive?

Using a loose installation of the chain and then utilizing a chain tensioner is considered the safest method for several reasons. Initially installing the chain loosely allows for the necessary adjustments to be made without putting undue stress on the components. This flexibility is crucial for ensuring that the chain can properly align with the sprockets as well as accommodate any misalignments that may occur due to the position of the drive mechanism.

After the chain is initially set up loosely, employing a chain tensioner helps to maintain appropriate tension. The tensioner ensures that the chain maintains consistent contact with the sprockets, reducing the risk of slippage or excessive wear. This method allows for adjustments to be made while minimizing the potential for over-tightening, which could lead to damage to the chain or associated components.

In contrast, starting with a tightly installed chain could lead to excessive tension that strains the bearings and sprocket gear, leading to premature failure. Aligning the chain with a wrench directly does not account for the dynamic elements of the drive, and adding a secondary chain for support is generally not a standard practice and complicates the system unnecessarily.