In general an axle width should be chosen that is close to the width of the deck it will be used with. For example, a 7.75" wide deck will usually be fitted with trucks that have axles between 7.5" wide and 8.0" wide. (Standard truck axle nut size is 5/16"-24tpi UNF, and the thinner "jam" style with an optional nylon lock.) Trucks that are too wide can make doing tricks difficult and can cause the wheels to get in the way when the skateboard is being ridden. Trucks that are too small can be hard to maintain stability and can cause wheel bite to occur when turning.
The most common shape in skateboarding is called a popsicle shape. It has a curved tail and nose and features concave, which gives the board it’s shape. New skateboarders looking to learn how to carve, push, ollie, kickflip, and grind boxes, ledges, and rails should start with a popsicle shape. If you’re interested in knowing, we explain selecting a board by width, riding style, and board shape in the skateboard decks section of the buyer’s guide.
Pop the board in the air – The reason you jump up into the air in the first place is because you’re slamming the back end into the ground (don’t worry, your board is made to take the abuse). It’s the same motion you would do if you were standing near the board and wanted to pop the board up into your hands, except this time, you’re standing on top of it. As soon as you feel the board pop into the ground, kick your front foot up into the air at the same time. The timing on this is important: kick too early and you won’t go anywhere, kick too late and your board will fly out from underneath you.
The top part of the truck is screwed to the deck and is called the baseplate, and beneath it is the hanger. The axle runs through the hanger. Between the baseplate and the hanger are bushings, also rubbers or grommets, that provide the cushion mechanism for turning the skateboard. The bushings cushion the truck when it turns. The stiffer the bushings, the more resistant the skateboard is to turning. The softer the bushings, the easier it is to turn. Bushings come in varying shapes and urethane formulas as well as durometers, which may affect turning, rebound and durability. A bolt called a kingpin holds these parts together and fits inside the bushings. Thus by tightening or loosening the kingpin nut, the trucks can be adjusted loosely for better turning and tighter for more stability (useful when landing tricks). Standard kingpin nut size is 3/8" - 24tpi. The position of the hanger respect to the baseplate is also determined by the pivot, a rod that slots into the corresponding seat in the baseplate. The pivot stops the hanger from rotating around the kingpin. The pivot must allow some movement around the bushings and therefore is not a perfect fit. The space between the pivot and its seat in the baseplate is filled by a pivot cup, a plastic part that will take most of the wear and tear of the pivot and assist in centering the hanger needs to be lubricated every so often.