On the chain thing, I want to add one thing about lubrication that I overlooked previously. While the primary wear point is the interface between the pins and the inside of the hollow inner links, the rollers actually ride on the outside of those same hollow inner links. In the better o-ring chains those rollers have a seal at each end and receive lubrication from inside the o-ring sealed area. On some others the roller is only lubricated from the outside, so when using those chains the sprockets may last longer if the chain is well and often lubricated. The chain itself will not wear, as that is primarily at the inner pin (that's where chain "stretch" occurs). But if the rollers bind up then the sprocket teeth will erode quickly.
The point here is that even o-ring chains are not all created equal.
The point here is that even o-ring chains are not all created equal.
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