Usually cables stretch so dereilurs become miss alligned. So you might notice skipping in the rear, chain rubbing in front. Umm thats about it actually. One thing I discovered with my new bike (I guess I forgot with my old one), is that original stuff they put on a chain is pure crap. It's like a freaken magnet for dirt and grime. So might be a good idea to clean the chain and put something else on. Which is a personal preference. I like white lightning.