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.
Rails (or ribs), are narrow strips of plastic or metal that are attached under the deck lengthwise along the edges. They are used for additional grip for grabs, and to enhance sliding while protecting the deck's graphics at the same time. Rails also provide a more consistent feel for slides, as the slide of a regular skateboard will suffer from the wear of the paint or varnish on the bottom of the board. Although rarely used anymore, they are useful for experienced skaters that are capable of grabs.
Playwheels Disney Skateboard For Kids is a 21″ Wood single kicktail deck with painted edges. It has clear sand spray top grip with color graphic and full-color bottom graphics with a retro shape. It features multi-colored composite truck and baseplate components with carbon steel axles. This is great for kids who are starting to learn skating. It has an average rating of 4.2 on Amazon.
Smile and wave – Feel free to look around at all the other people at the skatepark that stood by and marveled at your new-found accomplishments (all one of them). I’m sure by this point you’ll be picking up roses that are being thrown at your feet, and taking a well-deserved bow as they begin to chant your name. Take it all in, thank the crowd for their undying affection, and then go get a snow-cone. You deserve it, champ.