You may notice a discrepancy between what we designate a wide, standard or narrow and what the brands do. This classification is our opinion based on years of skating, as well as looking at the profile of the wheel as it compares to what we believe is a standard profile. You just have to trust us on this.
Standard - Your classic wheel shape, it's not built to excel in specific scenarios like a narrow or wide wheel, but it's appropriate for most situations. If you're new to skating this is where you want to start.
Smooth - Smooth wheels have less surface friction than treaded wheels and are easier to slide.
NRG Urethane - According to Ricta, NRG formula is the fastest urethane in skateboarding, it's been proven in the laboratory and backed up with testimonials from professional skaters Brandon Westgate, Caswell Berry, Cairo Foster, Tom Asta and Nyjah Huston.
81b - A street oriented wheel that can handle the park just as well. Hard and fast roll.
Most urethane skate wheel durometers (hardness of a wheel) range from 75a-101a, the higher the number the harder the wheel. The "b" scale you see here reads 20 points lower than the "a" scale, so an 81b is essentially a 101a in the hardness spectrum.
This is the riser size we suggest using if you want to avoid wheel bite, essentially the larger the diameter of the wheel the more likely you are to get wheel bite if you don't add risers of this size to your complete, so the larger the wheels the larger the riser required.