Originally Posted by VegasJen

There are different size chains between 9 and 10 speed? I'll have to look closer at my bikes. They all look the same to me.
As for emergency info, I had custom military-style "dog" tags made and I've laced one into my shoes. I also carry a photocopy of my DL with emergency contacts on the other side. That stays in a small waist pack I always ride with.
But what's with the spoke wrench? I'm not saying it's a bad idea, I just can't figure out what kind of failure you could have where a spoke wrench would help without any replacement parts. I posted this to learn from others.

What's an "RD"? I'm sure it's something simple but it's not clicking with me at the moment.