"New school" skating

The fourth and current generation of skateboards is dominated by street skating. Most boards are about 7¼ to 8 inches wide and 30 to 32 inches long. The wheels are made of an extremely hard polyurethane, with hardness(durometer) approximately 99a. As Steve Caballero had shown on vert in the mid-80's, very high durometers offer the benefit of reduced drag on hard surfaces which results in an overall faster ride, so long as one avoids rougher terrain. The wheel sizes are relatively small so that the boards are lighter,and the wheel's inertia is overcome quicker, thus making tricks more manageable. Today, modern wheels are currently around 48 to 60 mm in diameter and advances in technology have made them extremely light compared to the wheels of the eighties. Most decks are still constructed out of Canadian Maple, with 7-plies being the industry standard for strength and durability. Board styles have changed dramatically since the 1970s but have remained mostly alike since the mid 1990s. The contemporary shape of the skateboard is derived from the freestyle boards of the 1980s with a largely symmetrical shape and relatively narrow width. This form had become standard by 1992. During the 90s ramp or vert skateboarding dropped in popularity.

While street skateboarding remains popular, its rigid conformity and high attrition rate does not appeal to everyone, and there is a resurgence of other types of skateboarding brewing. Longboarding, speedboarding, downhill sliding, pool or bowl skating, slalom, and ditch skateboarding are thriving all over the world, albeit below the radar.

Source: wikipedia.com