A new roller chain undergoes very little lateral movement. A quick test to determine the extent of roller chain wear is to push sideways on the slack section of the chain. If the chain moves sideways more than 10% of the span between sprockets, it is worn significantly. Chain lubrication is often neglected. Look between the roller and a side link as you push on the slack section. If you see moist lubricant, that's a good sign. If the chain is bone dry and has a lot of lateral movement, it should be replaced, since it probably is so worn that it will not retain lubricant well and will need tensioning often.

When you see the situation pictured here, the machine has seen plenty of service. The idler or tensioner has been fully extended, but the chain is still slack. Also, the sprocket teeth are badly worn. Some owners will remove a link or two from the chain. Although this philosophy will help keep the machine running a while longer, it may not be reliable. If the rest of the machine is also in poor condition, steer clear; if the rest of the machine is in good shape, replace the worn sprockets and install a new chain.

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