The wheels of a skateboard are usually made of polyurethane, and come in many different sizes and shapes to suit different types of skating. Larger diameters (55–85 mm) roll faster, and move more easily over cracks in pavement and are better for transition skateboarding. Smaller diameters (48–54 mm) keep the board closer to the ground, require less force to accelerate and produce a lower center of gravity which allows for a better response time, but also make for a slower top speed and are better for street skateboarding. Wheels also are available in a variety of hardnesses usually measured on the Shore durometer "A" scale. Again like car tires, wheels range from the very soft (about Shore A 75) to the very hard (about Shore A 101). As the A scale stops at 100, any wheels labeled 101A or higher are harder, but do not use the appropriate durometer scale. Some wheel manufacturers now use the "B" or "D" scales, which have a larger and more accurate range of hardness. Modern street skaters prefer medium-sized wheels (usually 51–54 mm), as small wheels with lighter trucks can make tricks like kickflips and other flip tricks easier by keeping the center of gravity of the skateboard closer to the deck, thus making the deck easier to spin. Street wheels are harder (A 100/A 101). Vertical ramp or "vert" skating requires larger wheels (usually 55–65 mm), as it involves higher speeds. Vert wheels are also usually slightly softer (A 98/ A 99), allowing them to maintain high speed on ramps without sliding. Slalom skating requires even larger wheels (60–75 mm) to sustain the highest speeds possible. They also need to be soft and have better grip to make the tight and frequent turns in slalom racing. Even larger wheels are used in longboarding and downhill skateboarding. Sizes range from 65 mm to 100 mm. These extreme sizes of wheels almost always have cores of hard plastic that can be made thinner and lighter than a solid polyurethane wheel. They are often used by skateboard videographers as well, as the large soft wheels allow for smooth and easy movement over any terrain. 

The Wonnv Retro Mini Cruiser 22 inch Complete Skateboard is 22″ Light Up Clear Banana Skateboard.  It is complete with Light Up Board, Wheels, Metal Trucks, ABEC-7 Bearings, and High-Quality Bushings.  The set also includes 6″ Metal Trucks, High-Speed ABEC-7 Bearings, High-Quality Bushings, and Hardware.  It has a unique Textured Waffle Pattern on Deck and designed for Maximum Grip.  The Deck measures about 22 x 6 x 4″.  It has a 6″ Truck Axle and 3″ Truck Hanger.  It requires 2 AAA Batteries and is recommended for skaters who are 6 years old and Up.  It has a 5 rating on Amazon.
Bought as a Christmas gift for our nephew. He's not an expert or anything so I was looking for something that would work while he gets used to riding one. When I received it I pulled it out of the package to check it out and the construction was good. The wheels spun smoothly and the grip tape was nicely put on. I don't know how it would resist to some board slides but for a 15 year old just starting out its a good board.

It looks simple but yet complicated and vice versa. It takes most weeks to months to learn n some even years but a lifetime of effort to be consistent and be perfect at it and able to go higher, faster and further. It is not a feat you achieve once and it can be thrown out of the window if you want to continue to skate well. I've know skateboarders who just does ollies, boned ollies, ollie north and ollie souths, fakie ollies, switch ollies and nollies and nothing else but everytime he's popping them over 3ft height and up ledges, over gaps and down stair sets or over handrails. So no one's gonna argue on that even though he's not bustin some new fangled pressure flip late flip revert or something. He gets mad street creds for those huge ollies.

The wheels are also impressive. Unlike some other skateboards that have wheels that are quite stiff, causing them to feel like they will lock up when you ride on them, the wheels in this complete skateboard for beginners are smooth and comfortable. These are also easily controllable, so rest assured that they offer a smooth and friction-free glide.
Velocity Boards Retro Banana Skateboard is a 22″ Complete Board Set with 6″ Aluminum Trucks, ABEC-7 Bearings, High-Quality Wheels, and Bushings. It is designed for maximum grip. The Deck measures about 22 x 6 x 4″. The truck Axle has a Width of 6″ and the Truck Hanger has a Width of 3″. It has a maximum load capacity of 176 lbs. (80 kgs.) It is best for skaters who are 6 years old and Up. It has an average Amazon rating of 4.7.
The DreadXBoards Concave Skateboard has Plastic Deck Injection Molded for excellent durability. It features Urethane Wheels 59mm 78a, aluminum trucks, and Abec 7 Bearings. It is completely assembled and is ready to ride. It is perfect for beginners or experienced riders. It can load up to 185 lbs. It is great for kids and adults. It has an excellent rating of 4 on Amazon.
The Powell Golden Dragon 2 Skateboard is an affordable and complete skateboard for the beginners and also for the advanced skaters.  It has high-rebound, hand-cast polyurethane wheels to give you a great roll and grip.  It measures 7.5 inches wide with a colorful screen-printed bottom.  It is made in China and has an average rating of 4.2 on Amazon.
The board is shaped like a cup in the center, and has whale tails on both ends, designed to make tricks easier to do. The blue stain on the board looks like the picture. It has a semi flat finish with no lacquer top coat. The underside is plain which allows the owner to add stickers and graphics if they want but they look great just the way they are.
There is no governing body that declares any regulations on what constitutes a skateboard or the parts from which it is assembled. Historically, the skateboard has conformed both to contemporary trends and to the ever-evolving array of stunts performed by riders/users, who require a certain functionality from the board. The board shape depends largely upon its desired function. Longboards are a type of skateboard with a longer wheelbase and larger, softer wheels.
The Fakie is almost the same thing as a regular ollie-pop, but instead of going forward, the skater is going backwards when they pop the board up in the air, usually performed when you’re in a switch stance. A switch stance is when your feet are in the opposite stance of how you normally would stand, like when you write with your left hand instead of your right (if you’re right-handed).
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