Stems are generally one piece with the gooseneck on cruiser bikes. They come in different diameters and lengths. The size needed in diameter is determined by the fork. A special shim can be purchased and used when the stem is smaller then the fork. Generally one piece with the stem but can be separate and bolt onto the stem as with BMX and Mountain bikes. Goosenecks made for BMX bikes can make a neat custom feature on a cruiser but some are intended for 7/8 handle bars and wont clamp nicely on the 1" bulge of most cruiser handlebars.

Also called a front sprocket. Comes in varying tooth counts. The tooth count will effect how hard or easy the bike pedals (more= harder, less= easier). The center whole can vary in size, some are smaller not intended for 1 piece cranks but the hole can be filed bigger to fit. Chainwheels also come in varying widths. 1/8" is typical for a single speed or internal gear bike. The smaller 3/32" is used for multispeed (derailer) bikes. The bigger 3/16" require a big heavy duty chain and are made for bmx/freestyle bikes.

Cranks can come in 1, 2 or 3 piece. The pieces of a crank are the left and right crank arm and the spindle. A 1 piece the crank arms and spindle are all one. Crank arm lengths can vary. The crank arm may be drilled and threaded for either a 1/2" or 9/16" pedal. Typically cruisers have a 1 piece crank that accepts a 1/2" pedal. The crank arm is held in place in the bottom bracket with a nut that is reverse threads.

Chains come in 3 sizes (width) 3/32, 1/8 and 3/16 . The size of chain will be determined by the chainwheel or sprocket. Generally singlespeed cruisers will take the middle size (1/8). The smaller chain is for multispeed bikes that use a derailer and the bigger, heavy duty for freestyle and bmx.