Guide,
What Size Longboard Should I Get? A Guide by Use
Shorter boards feel agile and are easy to carry, while 38 to 42 inches gives a beginner extra stability; width adds room for the feet.
Length
Shorter longboards feel agile and are easy to carry onto a bus or into a lecture hall. Boards around 38 to 42 inches give a beginner extra stability, and a longer wheelbase settles the ride at speed at the price of wider turns.
Width and standing room
A wider deck leaves more room for the feet, which helps while you are learning to push, carve and place your stance. Narrow decks feel quicker and suit riders who already know how they like to stand.
Match the size to the job
Commuting, cruising, downhill, dancing and freeride each favour a slightly different setup. Commuters value a board that is light and short enough to carry; downhill riders value a long, stiff, low deck; dancers want a long, wide one. If you are unsure, a cruiser in the middle of the range is the safest first board.