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Typical longboard wheels range from 65 to 107 millimeters (2.6 to 4.2 in) in diameter. A taller wheel will have slower acceleration but a faster rolling speed. Smaller wheels have the opposite effect. The durometer of a wheel is how hard the urethane is. A softer wheel will be ultimately slower than a harder wheel on smooth surface.
Each skateboard wheel is mounted on its axle via two ball bearings. With few exceptions, the bearings are the industrial standard "608" size, with a bore of 8 or 10 mm (0.315 or 0.394 inches) depending on the axle, an outer diameter of 22 mm (0.866 inches), and a width of 7 mm (0.276 inches).
A skateboard wheel contains two bearings, which are subject to both axial and radial time-varying loads. Most commonly bearing 608-2Z is used (a deep groove ball bearing from series 60 with 8 mm bore diameter) Many yo-yos, ranging from beginner to professional or competition grade, incorporate ball bearings.
Slalom skateboarding is a form of downhill skateboard racing that first appeared in the 1960s and 1970s and has made a resurgence in popularity in the 2000s. Slalom racers skate down a course usually marked by plastic cones. The racer tries to get through the course with the fastest time, while knocking down the fewest cones.
Kryptonics soon became the dominant wheel for all types of skateboarding, excelling on all types of terrain and winning more races than any other wheel brand. Skateboarders such as Stacy Peralta , Tony Alva , Steve Alba , Micke Alba , David Hackett , Bobby Piercy , Tommy Ryan , and many others were or are sponsored by Kryptonics.
As a wheel wears it will decrease in diameter, and its effective cutting speed will be reduced. Some grinders have the provision to increase the spindle speed, which corrects for this loss of cutting ability; however, increasing the speed beyond the wheels rating will destroy the wheel and create a serious hazard to life and limb.
Wheels: Usually made of polyurethane and sized between 39 and 70 millimeters in diameter, their hardness is measured by durometer, a number ranging from 0 to 100. Soft wheels have a durometer of about 85, hard wheels have a durometer of 98 or higher. .63 mm wheels are usually reserved for longboards , which go significantly faster and benefit ...
Urban skates Hockey skates. Inline skates are boots with wheels arranged in a single line from front to back, allowing a skater to roll along on these wheels. Inline skates are technically a type of roller skate, but most people associate the term roller skates with quad skates, another type of roller skate with a two-by-two wheel arrangement similar to a car.