I assume you mean Spitfire brand, and no they are great. If you are concerned with weight of products, you probably need to skate for a few years more. and anyway you shouldn't even be thinking about those you should be buying RICTAS!
No
Wheels dont make a skateboard easier to turn on the skateboard trucks do that.
no
yes the sizes of skateboard wheels range from 40-70 mm
Bones wheels
yes
Shark Wheels are a type of skateboard wheel that have a unique shape resembling a cube with grooves. They differ from traditional skateboard wheels in that their design claims to provide better grip, speed, and maneuverability due to their shape and pattern.
polyurathayne,
4
Wheels
The wheels allow them to move. If you look at a skateboard it has wheels.
Skateboard companies make decks and wheels