QUESTION:
1. How do you know before hand whether or not the U lock is too small for your frame?
Many bike shops have a rack or parking meter, so try out the lock before you buy it.
2. Is it true that narrow U locks are better than wider ones because you can put some weird theif thing in it?
Narrow U locks are better because they leave less room for a thief to try and pry it open.
Solution to my seat troubles:
1. How many people use a seat lock? I can't imagine someone spending time to break through the plastic.
I don't use a seat lock, and have yet to have it stolen, although i have been thinking of putting a bolt on the seat clamp.
2. What is this business about allen bolts? I haven't a clue how to put it in.
get yourself an allen wrench, or as i and probably most people here use a bike multi-tool.
QUESTION
1. How the f*** do you use a "wheel skewer"?
The wheel skewer is what goes through the wheels so that you can attach the wheels to the frame/fork. I use a locking skewer http://www.oredon.com/content/en/produits.php?id=24 but i think bulldog makes something similar.
2. Again, what is this business with bolts?
Most wheels have quick-release, a bolt just makes it less likely that an opportunist thief will steal them.
3. Some U locks come with extension cables. If a theif could quickly get through my cable lock, wouldn't an extension cable be even EASIER to cut through? So it is essentially useless, right? I saw a website that said they are harder to cut through. As thin as they are, I don't believe it.
The idea of using a cable lock on the wheels in addition to a U lock comes from the fact that a thief may only have one cutting tool for one or the other, but not both.
4. Why can't I just buy another U lock and lock the front wheel to a post with that?
You can!
How can I keep my bike secure during the night when people are not walking by so often?
First, if possible, never lock your bike overnight! Second, take the precautions above and you shouldn't have to worry. Two U locks of different brands would be fairly theft proof IMO.
I have heard that renter's insurance will generally cover your bike being stolen, even if it is out in the street. Can anyone confirm or deny this?