The wrong frame size is the most common mistake when buying a bike. A bike that is too big or too small tires you faster, strains your back and knees, and simply isn't fun to ride. The good news: finding the right size is easy.
Why frame size matters so much
The frame sets your body position on the bike. The saddle and handlebars can be adjusted, but only within the limits of the frame. With the right frame size you are in control, you sit relaxed and you pedal without unnecessary strain.
Size chart by height
Mountain bike frames are usually measured in inches, city and road frames in centimetres. Use this chart as a guide. Manufacturers differ, so always check the chart for the specific model.
| Your height | Mountain (inches) | City / trekking | Road |
|---|---|---|---|
| 150 – 160 cm | 13 – 14" (XS) | 46 – 49 cm | 47 – 50 cm |
| 160 – 170 cm | 15 – 16" (S) | 50 – 53 cm | 51 – 53 cm |
| 170 – 180 cm | 17 – 18" (M) | 53 – 56 cm | 54 – 56 cm |
| 180 – 190 cm | 19 – 20" (L) | 56 – 59 cm | 56 – 58 cm |
| 190 – 200 cm | 21 – 22" (XL) | 59 – 62 cm | 58 – 61 cm |
A more precise way: inside leg length
People of the same height can have different leg lengths, so your inside leg measurement (floor to crotch) is a better guide:
- Stand barefoot against a wall with your feet 15 to 20 cm apart.
- Place a book between your legs and lift it gently to your crotch, as if sitting on a saddle.
- Measure the distance from the floor to the top edge of the book.
Multiply the result in centimetres by 0.226 for a mountain bike size in inches, by 0.66 for a city bike and by 0.70 for a road bike (in centimetres). Example: with an 80 cm inside leg, a mountain bike frame is about 18" and a city bike frame about 53 cm.
Three quick checks on the bike
- Standover: straddle the frame with both feet flat on the ground. There should be at least 2 to 5 cm between the top tube and your crotch, more on a mountain bike.
- Saddle height: with the pedal at its lowest point, your leg should be almost straight, with a slight bend at the knee.
- Reach: your arms should be slightly bent at the elbows, without stretching your back or feeling cramped.
Between two sizes? If you like a nimble, sporty ride, go for the smaller size. If comfort and stability on longer rides matter more, choose the larger one.
The surest way is to try it
Charts and formulas are a good start, but nothing replaces a test ride. Visit our shop at Batinska 12 in Sombor: we will measure you, help you pick the right size and set up the saddle and handlebars before you ride off. Buying from another town? Call us with your height and inside leg length, and we will recommend a size before shipping.
