The worst thing you can do, regarding your safety and comfort, is to buy a bike that is too big or too small. Nothing can deter you from continuing a riding regimen more than a bike that is unfit for your size.
A small bike will make you feel constricted and hinder a good leg workout. If the bike is too large, it will throw you off balance and cause injury when you dismount.
Pick a bike size that feels comfortable to you. Here are a few things to note:
- A bike’s size is generally measured by its frame, specifically the bike’s seat pole tube. The seat tube is measured from its collar to the chainring hub.
- Mountain bikes and hybrids are measured in inches.
- Road bikes are measured in centimeters.
- Other times bikes are categorized as small, medium, large, and extra large.
To get your correct bike size you must take a measurement of your leg. Measure the inside of your leg from the crotch to the floor while you are barefoot.
See the chart below for your corresponding frame size.
|Inside leg measurement||Road bike frame size||Mtn. bike/hybrid frame size||Category: S, M, L, XL|
|29 ½ – 30 ¾ inche (75-78 cm)||48 – 51 cm||14 – 16 in||S|
|31 – 32¼ inches (79-82 cm)||50 – 54 cm||16 – 17 in||M|
|32½ – 34 inches (83-86 cm)||53 – 57 cm||17 – 18 in||L|
|34¼ – 35½ inches (87-90 cm)||56 – 60 cm||19 – 21 in||XL|