Originally Posted by
demoncyclist
If your cassette is that worn that the teeth are pointed, you need cassette, chain and probably chainrings. If you want to go from 9S to 10S, you will need new shifters along with a 10S cassette and 10S chain.
Thanks so much demon. Exactly what I needed to know. This is my first road bike and I purchased it used to make sure I would like it. Turns out I LOVE it. Walking a fine line between spending on upgrades or purchasing a new bike. Looks like I could pick up an Ultegra 9 speed cassette pretty cheap and not have to change anything. Sid