These are going to be significantly skinnier than the wheels that came stock with your 7.1 FX. You will, likely, not be able to run 32mm tires with these rims; the fattest you would probably want to use are 28mm, and even that may be pushing it.
The other issue you're going to have is with the rear freehub. Trek's website indicates that your 7.1 uses a 7-speed freewheel, rather than the 8-10 speed freehub that these wheels use. Unfortunately, I wasn't able to locate a wheelset that is likely to work for you on Backcountry. You may want to check with your local bike shop for more help. Good luck!
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It took some creative Googling, but I tracked down Mavic's professional tech manual (link below), and these have a weight limit of 100kg for the "rider and all gear." They specifically state that the weight does not include the bike, so as long as you're not wearing 7kg of clothes and stuff in your pockets you should be good.
In my experience the Vittorias run true to the claimed size, at least on my rims. They definitely run skinnier than Michelins for me.
From Fulcrum's website FAQ:
All Fulcrum wheels are constructed to meet the highest standards of resistance and durability. If you weigh over 109 kg/240 lbs we advise you not to use this product. Non compliance with this warning can damage the product irreversibly. If you weigh 82 kg/180 lbs or more, you must be especially vigilant and have your bicycle inspected more frequently (than someone weighing less than 82 kg/180 lbs). Check with your mechanic to discuss whether the wheels you selected are suitable for your use, and to determine the frequency of inspections. Using tires with a larger diameter and a frame that respects the standards will help to increase the lifetime of the wheels.
Bike fit is a highly personal question that usually requires more information than just your height and your inseam, though that's a good start. Backcountry has a fit calculator (http://www.backcountry.com/Store/catalog/fitCalculator.jsp) that will get you started, and Competitive Cyclist has a more detailed one (http://www.competitivecyclist.com/Store/catalog/fitCalculatorBike.jsp). Of note is that your pant inseam is not your actual inseam; your actual inseam is an inch or three longer than your pant inseam. Based on that, I would put you on a large. But run your numbers and see what you come up with. I started out buying bikes and trying to make them work. Definitely check before you buy, unless you have money to burn!
Yup, they're sold in pairs.
These wheels should work fine for your bike. You may need to adjust your rear derailleur, since cogsets will often mount with a slightly different alignment between different wheels. This is something your local mechanic can help with, if it's not something you're comfortable doing yourself. Good riding!
I got this for Christmas last year, and it has become my favorite outdoor shirt. It's tough (survived multiple rock climbing trips), it's incredibly lightweight, and it packs down to next to nothing. I'm 6'1", 185 lbs., and the medium fits surprisingly well. It's also long enough that I can tuck it in without difficulty, which is usually what puts me into a large in t-shirts.