****** - Verified Buyer
4.5
Until recently I was blissfully unaware of chain stretch. My chainring and freewheel and chain all "grew up" together. All seemed okay until I finally got a bike tune up and I learned that one cannot just install a new chain in this case because the stretched chain has eaten thru the chainring and freewheel so much that a new chain simply will no longer fit (in retrospect, it makes sense, but at the time I just just annoyed that they refused to replace the chain without replacing chainring and freewheel as well, saying the slippage would make it nearly unrideable. I did convince them to NOT replace the freewheel and sure enough, the slippage was extremely annoying).So now I have one of these and when the stretch exceeds .75, I will just buy a new chain, rather than having to deal with replacing the freewheel and chainring as well.The instructions for use are somewhat intuitive even if you cannot remember them. If you can get the tool to fit into your chain, replace the chain, if it will not fit, then they have not yet stretched enough to be needing replaced.
