how do you know when your chain is done?

[wr400rider]

just wondering what are some good indications of when you need to replace your chain? I have noticed in the high gears the chain makes a funny noise and at higher speeds this also could be my front sproket aswell because it does have to be replaced.

[bcs]

One rule of thumb is that if you grab the chain at the rear of the rear sprocket (that is, at 3 o'clock as you look at if from the left side of the bike) and pull back on the chain, if you can see a space between the pin and the sprocket it is time to replace. It its still OK, it is normal for it to pull away a bit but the sideplates will still block your view of the notch between the two teeth of the sprocket.

[Bamster]

Don't put a new chain on worn out sprockets.

I change my front sprocket often as it wears out quicker. Doing this I find the chain a rear sprocket last longer.

If your rear sprocket is starting to look like this reaplace everything

I know its a bicycle sprocket but its all I could find