They are neither driving nor driven sprockets. They are idlers. However, the tension pulley usually wears first. I suspect it is because of what its name suggests and that dirt reaches it first and either settles into a less abrasive position before it gets to the guide pulley or some such. People who cross chain a lot wear the pulleys down from the side, which makes the contact interfaces thin and more subject to wear.They look quite worn, particularly the guide pulley. Being "driven" rather than "driving", does it make much difference?
At what point should they be replaced? When the teeth won't hold (and shift) the chain under lateral load?
Why?Right is right. Never admit that it was for the wrong reasons.
Different on my 105 though (5700 series).They were the same on my 105 too.
To score brownie points. To appear invincible. To come across as a visionary. To be seen as a superhero. To be in a position where you can put your tongue firmly in your cheek and say "I knew that" and then wink at those who know that you know that they know. Pick your choose. Have some fun.Why?
All that acclaim would go to my head. Besides, I need to display some fallibility to just to show I'm only human!To score brownie points. To appear invincible. To come across as a visionary. To be seen as a superhero. To be in a position where you can put your tongue firmly in your cheek and say "I knew that" and then wink at those who know that you know that they know. Pick your choose. Have some fun.
I used to be like that, but now I'm perfect.All that acclaim would go to my head. Besides, I need to display some fallibility to just to show I'm only human!