Bike Size Calculator
A 5'9" (175 cm) rider typically fits a 53-55 cm road frame, a size M mountain bike (17-18 in), or a size M hybrid (18-19 in). This bike size calculator recommends a frame size range from your height and the type of bike you ride. Enter your height, choose road, mountain, or hybrid, and calculate to see a suggested size band.
Quick answer
Frame size is matched to a height band, not an exact number.
What this tells you
- •Frame size is matched to a height band, not an exact number.
- •Road bikes are sized in centimeters, mountain and hybrid bikes in inches.
- •The same height can map to a different label depending on bike type.
- •This is a starting point, not a substitute for a professional bike fit.
How to Use
- 1Enter your height and choose centimeters or inches.
- 2Select the type of bike: road, mountain, or hybrid.
- 3Calculate to see the recommended frame size range and size label.
- 4Test ride bikes near that range, since brands vary slightly.
How It Works
Formula
Height is converted to centimeters, then matched to a height band.
Each band maps to a frame size range per bike type.
Example: 175 cm falls in the 168-178 cm band, giving 53-55 cm (road) or 17-18 in (mountain).The calculator converts your height to centimeters if needed, then looks up the height band that contains it. Each band carries a frame size range for road bikes in centimeters and for mountain and hybrid bikes in inches, based on commonly published retailer sizing charts. The result is a range because rider proportions, riding style, and brand geometry all shift the ideal size within that band.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Road bike example
A height of 175 cm falls in the 168-178 cm band, which maps to a 53-55 cm road frame.
Mountain bike example
70 inches converts to about 177.8 cm, which is close to the top of the 168-178 cm band, but a 190 cm rider falls in the 185-193 cm band and gets a 21-22 in XL mountain frame.
Bike Frame Size by Height
General frame size ranges by height band and bike type, based on commonly published retailer sizing charts.
| Height | Road frame | Mountain frame | Hybrid frame |
|---|---|---|---|
| Up to 5'2" (up to 157 cm) | 47-49 cm (XS) | 13-14 in (XS) | 14-15 in (XS) |
| 5'2"-5'6" (157-168 cm) | 50-52 cm (S) | 15-16 in (S) | 16-17 in (S) |
| 5'6"-5'10" (168-178 cm) | 53-55 cm (M) | 17-18 in (M) | 18-19 in (M) |
| 5'10"-6'1" (178-185 cm) | 56-58 cm (L) | 19-20 in (L) | 20-21 in (L) |
| 6'1"-6'4" (185-193 cm) | 58-60 cm (XL) | 21-22 in (XL) | 22-23 in (XL) |
| 6'4" and up (193 cm and up) | 61-63 cm (XXL) | 23-24 in (XXL) | 24-25 in (XXL) |
These bands are general estimates drawn from widely published bike retailer sizing charts. Individual brands publish their own charts that can differ by a size in either direction.
Common mistakes
- Using a road bike sizing chart to size a mountain or hybrid bike
- Ignoring inseam, arm length, and riding style, which shift the ideal size within a band
- Buying the top of a size range for a taller-looking bike instead of testing fit