Each skateboard wheel is mounted on its axle via two bearings. With few exceptions, the bearings are the industrial standard "608" size, with a bore of 8 mm (or 10mm depending on the axle), an outer diameter of 22 mm, and a width of 7 mm. These are usually made of steel, though silicon nitride, a high-tech ceramic, is sometimes used. Many skateboard bearings are graded according to the ABEC scale. The scale starts with ABEC1 as the lowest, followed by 3, 5, 7, and 9. It is a common misconception that the higher ABECs are better for skateboarding, as the ABEC rating only measures tolerances, which do not necessarily apply to skateboards. Bearing performance is determined by how well maintained the bearings are. Maintenance on bearings includes periodically cleaning and lubricating them . Bearings that are kept unmaintained have their performance greatly lowered and will soon need to be replaced. Bearing cleaning kits are commonly available on the market. The ABEC rating does not determine the speed or durability of a skateboard bearing. In particular, the ABEC rating says nothing about how well a bearing handles axial (side-to-side) loads, which are severe in most skateboard applications. Many companies do not show the ABEC rating, such as Bones Bearings, which makes bearings specifically for skateboarding, often marketed as "Skate Rated". Each bearing usually contains 7 steel or ceramic bearing balls, although other configurations are used as well.
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.)
When looking at skateboarding’s history, the only thing that’s stayed the same is the overall structure: every board consists of four skateboard wheels, two skateboard trucks, and a riding surface of some kind. And while we’ve come a long way from the days of metal and clay wheels, some aspects of skateboarding - like the brands manufacturing some of the most trusted products - haven’t changed at all. Independent Trucks has been designing trucks since 1978. Powell Peralta, the company responsible for Powell Skateboards, Bones Wheels, Bones Bearings, and the Bones Brigade also started in 1978. NHS, Inc., the company that produces Santa Cruz Skateboards, Independent Trucks, Bronson Speed Bearings, Krux trucks, Flip Skateboards, Ricta Wheels, Mob Grip, and OJ Wheels started in 1973. It’s no wonder these brands are still doing so well - they’ve been with skateboarding since the beginning. Since the day skateboarding went from something surfers did when the waves were flat to its own sport that involves technique, practice, and careful consideration, a small handful companies have been there to help skateboarding become what it is today.
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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.
This was a simple purchase. No issues at all and the skateboards are really nice! Some people have said it comes unassembled, that's not the case. I ordered 2 different boards and both came assembled and ready to roll.. The boards are topped with grip tape and trucks and wheels were assembled perfectly. If I had a need to get another board I would run straight back to this kit, they are great!
4 amazing skateboards in one nice lot. 1. 1990's Tony Hawk Conplete Skateboard, original falcon 3 design. With Rekon trucks and firelite classic wheels. 2. Sk8mafia Lucero deck. Signed by John Lucero. Brand new deck. 3. 1031 deck signed by entire team on a brand new creepy crawl deck. 4. Brand new super rare Big Mess deck with Blast design. This deck is extremely rare and is a must have for any collector. Both the signed decks are personalized to a guy named Jason that owned a skate shop here in Grant's Pass Or. Those guys were on his wall for a long time before he went out of business. If you have any questions or concerns please let me know. Thanks for looking. Steve