Bob, the guy who was looking at my bike didn't have a whole lot of time so I'm not sure that he was able to look at the front chain ring. But, since you mention it, it will be one of the questions that I ask when I go to the mobile repair stand.
I too think it's pretty cool that they have the mobile repair stand in the area! The purpose of it is to help people become more independent with their bike repairs and learn how to do a lot of it themselves. According to the website, the only requirement is that people are willing to get their hands dirty. They bring all the tools apparently.
TRAGICCNET, Pretty cool that you can get use of work stand and advice for free! That will force you to become knowledgeable about your bike and better able to maintain it. From what you posted, you'll need to know how many sprockets are on the cassette, and how many teeth each has. If it has eight sprockets (speeds), you'll need an eight speed cassette and chain. I'm not confident that both are worn but still suggest that you replace both. What about the front chain rings? Aren't they worn as well?
I'm fairly new to cycling and just bought a new/used bike (new for me, but used). Apparently the previous owner put the wrong size chain on the bike, which then wore down the cassette and both need to be replaced. I was wondering if there is a way to tell by looking at the both the chain and cassette and/or bike to find out what size/kind/etc that I need so I don't have to go into a bike shop and buy what I'm sure are overpriced parts. In my area we have a mobile repair stand where all the tools are provided and people help you fix your own bike (yay for learning new stuff!) but I'm a little lost on the parts that I need so that I can even give it a shot. I assume it's much like buying a part for a car in that there are different sizes and kinds for different makes and models of cars.
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