I have a Trek 520 (the 2007 model) on order through my LBS. While the bike is on its way I'd also like to order a supply of spare chains through mail order, but I'm unclear on which exact chain make/model the Trek 520 uses, and the LBS didn't know when I called them. The Trek web site doesn't say.
So, does anyone know? Is it the Shimano HG-73, for example?
Also, I've been wondering about this: when you buy Shimano chains like the HG73, does the new chain come with spare pins, or do you always need to have a supply of the Shimano 9-spd replacement pins?