And here is the text (there were database issues while I was trying to post this):
I have a DB Topanga Comp '05. This is my 1st yr riding. I recently replaced the chain with a new PC951. I have read about some who replace cassettes and chain rings when they buy a new chain, but I didn't think mine would have that much wear yet. On my 1st ride with the new chain, when under load (I am ~ 220 Lbs) up hills, accelerating, etc, I had much slippage, not just 1-2 links but the entire chain slipping around the smaller cogs in the cassette. Is it possible that, even though I haven't had the bike long, that I need to replace the cassette, since I am fairly hard on it? Have I just answered my own question?
And since I am in my middle ring 98% of the time, should I replace that as well? It seems that the chainring would have a harder time slipping than the small cogs.
After writing this, it begs another question. Should I attempt to spread out my riding more evenly over all 3 chainrings, or should I just plan on replacing my middle chain ring more often. It seems that if I wear my chain and middle ring together, then when I go to use the big or small chainring, the chain would be too stretched for them.