Whether you ride a road, hybrid or mountain bike – it is always recommended to get a frame size that suits your height and size. Having a fitting frame size will allow you to optimize your cycling performance and will ensure you comfort when you spend time in the saddle.
If you’re in the process of searching for a new bike, the following tips will help you identify the appropriate frame sizes of different types of bicycles to give you that perfect fit.
Before that, it’s also key to understand the common parts and measurements that are used for general bicycle frames.
Most bicycle manufacturers will use the Seat Tube value as the size of the bike. (e.g. 48cm, 51cm frame). The measurements for different tubings are taken from center-to-center unless otherwise stated. Also bear in mind that road and mountain bike frames have different geometries and may also use different units of measurement. (inches or cm).
1. Measurement Charts
Based on your height and measurement of your inseam (inside of your leg), you will be able to get an estimated frame size for different types of bikes.
2. Calculation Method
Alternatively, this calculation method only requires you to measure the length of your inseam (the insides of your leg from the groin) and multiply it with different factors.
For Road Bike Frames, simply take your ( Leg Inseam) x (0.66) = frame size in cm.
For Mountain Bike Frames, take your ( Leg Inseam) x (2.54) = frame size in cm.
*Disclaimer, the calculations are a theoretical and an estimated frame size based on your height and a general factor. Do allow some deviation when using this method*
3. Standing over Top Tube
Lastly, the simplest way to gauge whether or not a bike is suitable, is to stand over the top tube. This simply makes use of your inseam length (similar to the above mentioned charts) but instead gives you a physical gauge to determine whether or not a frame is too big for you.
If you are able to stand above the frame with 1-3 cm of clearance from the top tube to your groin, the bike is of an acceptable size.
If ever unsure, always consult a proper bike salesperson/mechanic for tips on getting the right frame size. To find out how your other bike components should be set up, click here.