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Hello - apologies for revisiting this one. Newbie here and I've been looking for guidance about chain tension for my Mercury Mk3. I saw the guidance in the Thorn handbook and was looking for a little more detail which you have provided. Having just switched from a derailleur system I'm wondering if a simple, in my case Park Tool, chain checker could be used. Possibly a naive question but why is the recommended method as it is and not simply measured from link to link. Thanks in anticipation. Ray.
You will adjust the chain tension several times before your chain is worn to the point where the chain needs to be replaced.
A chain has to have a bit of slop or looseness in it to avoid excess tightness than can wear other components. That is why it has to be set initially so that it is not too tight.
