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.
For sale I have a Powell peralta old school ripper complete red and black with 169mm independent blackout trucks blue cambria 3md 62mm wheels and bones reds bearings The deck has only been skated twice with minor scrapes on the tail and wheel wells I added the independent blackout 69mm trucks and the Cambria wheels im selling it because I’m moving in a different direction I’m building a longboard for myself for this summer anyway the deck is a reissue ripper you can’t get it anymore great overall skater very durable
Whatever you do, don’t give up. Keep trying. If what you’re doing isn’t working, try something new. Skateboarding is all about experimenting with new ideas and finding out what works. Keep tweaking your results until you get what you want. Watch as many trick tip videos as you can, get advice from good skaters, and remember to enjoy yourself. If you don’t give up and you keep trying, eventually you’ll master the Ollie. Don’t let it frustate you, it takes time and lots of practice.