Frame size generally refers to frame height, the length of the seat tube from the bottom bracket (crank bearing) to the top tube.
Subsequently, one may also ask, how is frame size measured on a bike?
Adult bikes are measured by their frame size. Most manufacturers now measure the frame from the centre of the crank axle, to the top of the seat tube. Most road bikes are measured in centimetres (cm), whereas mountain bikes are generally measured using inches (in).
Subsequently, question is, what size bike should a 5 foot woman get? Women's road bikes
In this manner, what size is a 20 inch bike frame?
SIZING (ROAD BIKES)
| HEIGHT | FRAME SIZE |
|---|---|
| 5'5" to 5'7" | 20 to 21 inch |
| 5'7" to 5'9" | 21 to 22 inch |
| 5'9" to 5'11" | 22 to 23 inch |
| 5'11" to 6'1" | 23 to 24 inch |
What size is a 21 inch bike frame?
SIZING (ROAD BIKES)
| HEIGHT | FRAME SIZE |
|---|---|
| 5'5" to 5'7" | 20 to 21 inch |
| 5'7" to 5'9" | 21 to 22 inch |
| 5'9" to 5'11" | 22 to 23 inch |
| 5'11" to 6'1" | 23 to 24 inch |
