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.
Skateboards can be bought online and in your local stores.  However, choosing a good skateboard can be challenging.  If you are a beginner there are a lot of things that you have to consider.  Aside from the cost, you should also check the entire board such as the wheels, the deck, the trucks, and others.  Here, we have compiled the best skateboards for sale that you can choose from right now.
Low ollies: This can happen for a lot of reasons, but the biggest one is that you are not crouching low enough before your ollie, and not pulling your feet high enough after you jump. When you crouch down, try and touch the ground. When you jump, try to hit yourself in the chest with your knees. ​Both knees. Don’t worry about falling. That will happen sometimes – that’s just part of skateboarding! For more help, read the How Can I Make My Ollies Higher? FAQ

If you’ve ever watched a skateboarder roll down the street and then all of a sudden pop into the air on a skateboard, you’re probably wondering the same question a lot of people do: how on earth do they do that? It almost seems magical how they just seem to explode off the ground, and then just kind of float. Skateboarder, meet, the ollie. It’s not in the category of “easy skateboard tricks,” but if you learn how to ollie, you’re well on your way to fame and fortune as a professional skater.
In fact, we can work out how you need to steer the skateboard. Tracker has a nice feature that we'll call 'force arrows'. These arrows show you how much force acts on an object at every instant, and in which direction the force acts. So for example, if you were to kick a ball into the air, while the ball was mid-flight, this arrow would always point down and be the same length, even though the ball is moving forward. That's because the only force acting on the ball is gravity, which pulls it straight down, and acts with a constant strength. (For those of you who've studied physics, these arrows denote the acceleration of the center of mass, which by Newton's second law is proportional to the net force acting on the skateboard.)
Velocity Boards Retro Skateboards is a complete 22″ Banana Skateboard.  It includes 6″ Lightweight Aluminum Trucks, High-Speed ABEC-7 Bearings, High-Quality Wheels & Bushings and Hardware.  It has a Unique Textured Waffle Pattern on Deck and is designed for Maximum Grip.  The Deck measures about 22 x 6 x 4″.  It has a 6″ Truck Axle and a 3″ Truck Hanger.  It has a maximum weight capacity of  176 lbs. (80 kgs.).  It is great for all skaters who are 6 years old and above.  It has an Amazon rating of 4.7.
Skateboarding, in one form or another, has been around since the late 1950’s when the first brave pioneer first attached roller skate wheels to a piece of wood. As skateboarding progressed to mimic surfing, skateboards evolved with the style of riding. Skateboards grew and changed shapes as riders experimented with everything from plastic to fiberglass to aluminum constructions - all in an effort to push what was possible. Like most sports or art forms, progression is at the heart of skateboard innovation.
To get higher ollies, I would suggesting resting your back foot on the very end of the tail and the front foot in the middle of the deck to allow for more slide. Popping as hard as you can and catching your board in the groove of the nose with you ankle practically resting in the groove will level the board out in the air. after this initial movement slide you feet back to the bolts on the tail and nose to ensure a clean landing.
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