You guys are pretty dumb...my cogs cost $2-$3 and I've never had to replace one for wear reasons. Same goes for chainrings if they are steel and, if you want to use an aluminum chainring then you should realize it is a disposable wear item that is also cheaper to replace than a chain.
Originally Posted by
Training.Wheels
and that's why perfect tension isn't supposed to be super tight or super slack. It prevents abnormal chain stretch and the chain falling off. All of which could be done without special techniques.
Ok, then tell me what finally ends the life of your chains: chain stretch or chain snap? If it's stretch then, in fact, you are the one who is having trouble with chain stretch because you aren't doing what you are supposed to be doing.
The logic is irrefutable. With the right equipment and/or the right technique chain stretch ceases to be a problem and, therefore, there is no need to prevent it. Motorcyclists call it "breaking in the chain", but bicyclists are brainwashed to buy a new one.