Hey, me again. This might sound really thick but what exactly are bearings & axle nuts? Are they something I need to get if I have 2 sets of wheels [indoor & outdoor]? & are they a one-size-fits-all kind of deal?
Hey!
Bearings are basically what makes the wheel roll. They go inside the wheel, 2 per wheel (so a 16 pack is what you need). You don't NEED a new set of bearings for each set of wheels, but it is nice since it makes changing wheels way easier (so you just have to switch the wheels out, not the bearings as well). It's especially nice to have a set of low quality bearings just for you outdoor wheels, since they'll get gross and messed up easier. That way you can keep your indoor bearings cleaner and in better condition.
If you wanted to get a new set of bearings, I'd get some for your indoor wheels and use the ones that come stock on the skates for your outdoor wheels (starter packages don't come with very good bearings). There are some relatively inexpensive bearings that are pretty good. Look at Bones Redz, Moto Deluxe, and Cheezeball Cheddars.
Axle nuts are the little nuts that go on the end of each axle and actually hold the wheel in its place. You'll have 8 of them. You only need one set per set of skates, but keep in mind that they do wear out if you change your wheels a lot. Be careful when you change your wheels and if you notice any signs of the threads inside the nut getting worn out, get a new set (don't worry, they are dirt cheap).