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.
Hey guys. I’m having a real problem with shifting my ollies. I’ve taken videos of myself in slow-mo and asked people to tell me of my shoulders rotate. They said that they stay where they are. My board always turns whenever I ollie, up to 90 degree turns. I think it might be the way I slide my foot. I’ve noticed that it may circle behind me a bit. And I’ve tried to correct it but just can’t. Any help?

Hey, I’m a girl too and I’ve been skateboarding for nearly ten years now. I’m not a pro or anything, but I used to ride around in the local skatepark that was mainly just a big bowl that was fun to just drop into and cruise around in. I’m only just now learning street tricks. Anyways, I’d go there and the dudes would sometimes tease me, but sometimes they’d tease me about it. The thing you gotta do is not give up. Just ignore them. Dudes are stupid. Practice at home, by yourself, and learn some awesome stuff. So when you get really good, you can go to the park and if they start saying bad stuff, show off. It’ll blow them away. It always made me feel really good to show them that I was better than them right after they teased me for it.
No one had ever seen anything quite like it before, but no one knew just how transformative that moment would become. It wasn’t just that you could simply pop up into the air, it’s that it gave the rider a whole other set of opportunities to do tricks, and you don’t even have to be dependent on a ramp! As time went by, people began to add other skateboard tricks while they were airborne.
Ohderii Skate Skateboards are made of a High-quality Plastic deck which will not easily break even when pressed over by a car.  It comes with 3.125″ all aluminum alloy trucks, 59mm 78A super smooth PU wheels and ABEC-7 stainless steel bearings.  It is ready to use and you can easily store it in your backpack.  It has an average rating of 4.5 on Amazon.