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.
Ride like the pros with Tony Hawk skateboards, Airwalk skateboards and boards from Razor�, Kryptonics, Maple� and other trusted brands. These high-quality skateboards utilize smooth-rolling trucks and ball bearings that prevent jams and freezing as you shoot through the half-pipe or roll down the sidewalk. And while performance is your top consideration, all your tricks and moves will look even cooler with a board that's splashed with bright colors, emblazoned with attention-getting graphics and made with a sleek design. Choose from styles with bold patterns and detailed, full-color artwork that showcase your personal aesthetic along with your athleticism.
Large power is created at the point of action by applying small power to the point of effort. Application of this concept to skateboarding makes the back wheels the fulcrum, the tail the point of effort, and the nose the point of action. Applying power to the tail causes the nose to shoot upwards. When the front foot of the skater levels the nose at a point roughly horizontal to the ground in anticipation of the tail, soon to be leveled likewise by the skater’s back foot, the process smoothly done creates the illusion of the skateboard ‘sticking’ to the feet.
Taotao Girls Skateboards comply to United State Consumer Product Safety Commission (CPSC) Standard.  It has a 24″ X 6″ Maple Double Kickside Deck. It features 608Z Bearings, 3.5″ Plastic Truck & Base, and 50 x 30 mm PVC Wheels.  The Safety helmet, Knee and  Elbow Pads also comply to CPSC Standard.  It has a Cool Pink Aloha Graphic Design with an Amazon rating of 4.3.
A skateboard deck is made up of curved layers of wood that are combined with glue. Then, the skateboard deck is trimmed down to a board shape that is practical. Trucks are typically made of aluminum or other metal alloys. They are made by melted metal formed by a mold and later drilled into the skateboard deck. The wheels are formed the same way, but with polyurethane. They are attached by ball bearings to complete the product.
My son seems to have a lot of fun riding this skateboard. He will be out there doing tricks for hours. One evening when he took a break, I decided to see if I could still ride. When I took off down the driveway, I could feel how smoothly the wheels rolled. I used to have to pay extra for wheels like this when I was his age. Lost in thought, I coasted faster, and my neighbour didn't see me when I shot out of the driveway. Even though this thing flew several feet in the air, bounced, and came to rest more than 20 feet away, it had no visible damage! Not so for me. I loved the skateboard, but am now recovering from two broken ribs, torn neck cartilage, and a cracked pelvis. Still, this board rides like a dream!

GREAT board. Great design graphics. The boards deck has a real POP to it that makes it GREAT for tricks and a AWESOME beginner board. Only problem is It's super slow and requires a lot of work to maintain speed or to pick up speed period. A simple $20 wheel barring upgrade will fix that and BOOM PERFECT board, PERFECT caved in deck. Only 4 stars because of the lack of speed. I prefer my boards ready out of the box already pre-upgraded, but for the price, no point in complaining. Like almost all new boards, u have to ajust the wheels and the flex of the board to customize it to your liking. You won't regret it. But order it with some "Lucky" or "Red bearings" and your set.