bearings
in the wheels
no, it is not harmful, although you must wash them with special 'bearings soap' to wipe off the mud and also not rust the bearings. :)
you can buy rims at a local skate shop
When you take the old bearings out they should have a number on them, write that number down and take it to a skate shop, or store that sells bearings. or just take your trucks or the whole board to a skate shop they will help you out.
yes, any standard skate bearing is compatible with longboards, they both use the same bearings
Yes and No, it depends on how good you are and/or the bearings.
well yes i got them and they are good and fast !
It is not necessary to oil your new bearings since they have never been used, but, it wouldn't be bad to oil them anyways.
First, remove the wheels from the chassis with a skate key/alan wrench. In the wheel hub, there should be one bearing on each side, now check the bearings to see if there is a spacer in the middle of the bearings. If there are spacers in between your bearings, you can push the spacer out to remove the bearings. If you have a mission skate key, (comes with every pair of mission skates) slide the skate key in the bearings where the axel would go, then push it until the bearing and spacer comes out... do the same with the other side. (put the spacer back in, then use it to push the other bearing out) If you have a tour skate key, (comes with every pair of tour skates) use the little nub on the side of the skate key to push the bearings out with the spacer. If your bearings do not have spacers in the middle, use a tour skate key to carefully pull each bearing out. (pull it slightly on each side like you would if you were pulling a computer chip out of a motherboard with a flathead screwdriver) If you do not have a skate key designed for removing bearings, I recommend you get one at your local pro shop or online store, otherwise you won't be able to pull the bearings out without damaging them.To put the bearings back in, just push them into the wheel hub.Do not forget to put the spacers back in if your skates require them!Weather your skates have spacers or not depends on the axel. (which is designed to fit your chassis, so don't try changing your axels on the same chassis) If you have 6mm axels, your bearings will need a spacer in the middle. If you have 8mm axels, you don't need and can't have spacers in your bearings. You may have different bearing sizes (608 standard bearings, or 688 "mini" bearings) but the process is the same.
most skate shops or online. zumiez, journey's, vans, ccs.com
bones Swiss are the best bearings.they are on the expensive side but are worth it.