The standard men's bike frame size is 19 inches. The standard women's size is 17 inches. These 2 sizes, with 26 inch wheels will be perfect for 98% of the bike riders. Most of our bikes are only available in those sizes. A couple of our bikes are available in different sizes. For more details check out the bike size chart below:

Comfort Bikes - The Right Size for You
Height	Inseam Length	Bike Frame Size
4'11" - 5'3"	25" - 27"	13 - 15 inches
5'3" - 5'7"	27" - 29"	15 to 17 inches
5'7" - 5'11"	29" - 31"	17 to 19 inches
5'11" - 6'2"	31" - 33"	19 to 21 inches
6'2" - 6'4"	33" - 35"	21 to 23 inches
6'4" and up	35" and up	23 inches and up