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 [1]. 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.
The grip tape found on a skateboard can actually be defined as the grainy sheet, which resembles sandpaper that also comes with a sticky underside. Such underside needs to adhere to the deck’s surfaces as a means of increasing traction or grip. No matter what skating style you use, the grip tape is extremely helpful in your attempt to stay on the board.

As you jump into the air, your front foot needs to roll slightly inward, and with the outside of your foot, you want to guide the skateboard as it flies into the air. Some people describe this as dragging the side of your front foot up the skateboard – that’s more or less what is happening, but what you are doing is using your shoe and the grip tape on the board to pull the skateboard higher into the air with you, and guiding the skateboard to where you want it.
This can be tricky to figure out, so just take your time and relax. The first few times you try and ollie, it helps to not worry about this part. You will end up doing a sort of half-ollie, popping just a little in the air. Or, you might fall! But, don't worry, this is all part of learning. If you want though, you can certainly start with rolling your ankle when you try and ollie - whatever works for you! Eventually, you will need to roll and drag, and you'll figure it out. Just take your time!
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When I was about 10, I broke my first skateboard by riding it into a ditch. A decade later, in college, I broke another skateboard within an hour of owning it (surely a record) in a short-lived attempt at doing an ollie. (Surprisingly, the store accepted a return on that board even though it was in two pieces.) Then I was gifted a really nice, high-quality skateboard. The first thing I did with it was ride it down a big hill, a valiant but ill-fated adventure which ended with me jumping off the skateboard, rolling down the grass, and arriving scraped up, deflated, and rather disoriented near the entrance to my college cafeteria. (In my defense, the wheels and ball-bearings on that skateboard had been pre-lubricated to minimize friction, and why would anyone do that, that's just crazy.)
The deck is expertly constructed with a vertically laminated bamboo core and bamboo veneer exterior, all attached with triaxial glass and epoxy as well as a course grip tape top. The grip tape is arranged in an unusual and stylish, yet functional design. The 34-inch board features a 13-degree nose angle and a 18-degree tail angle. With its directional shape, you’ll easily be able to cruise on this board or pull a few tricks. It is a lightweight and flexible deck.
I just can get any height on my ollie at all! so frustrating!, i can pop the board nicely and get it off the ground like that, but then i try to slide my foot up the board and it just stays at that 45 degree angle from when i popped it, i just can’t seem to slide and get it horizontal in the air, or any height for that matter, i have watched countless ollie tips and tricks videos, and practised for hours on end, the same ollie, i can ride smoothly and fine, along the side-walk for example but i just cant get any grip to bring my board up and forward (i bought a new skateboard yesterday, and also new shoes) so its obviously me which is incompetent in completing this ollie! I know im kind of waffling on a bit, but i just can get the board to get any height! Please help if you can!

The wheels of your skateboard can greatly affect your ride in numerous ways, such as the speed, your ability to take control of the skateboard’s movements, and what you feel while riding the board. The good news is that they come in various sizes, levels of durability, and colors, allowing you to pick one that suits your skateboard preference and style.