Guide: How to find the right frame size for Gravel & Touring bikes
Choosing a frame size for Gravel and Touring is about finding the perfect balance between your body's anatomy and the bike's geometry. Whether you are building a bike from scratch or buying a complete model, the goal is a position that allows you to ride mile after mile without unnecessary strain. In this guide, we'll explain how to calculate your theoretical size and fine-tune your choice based on stack and reach.
1. Calculate your theoretical frame or bike size
One of the most proven methods for finding a starting point for classic frames (measured center-to-top) is to use your inseam. It is easiest if you have a spirit level and take the measurement. Make sure you are not wearing shoes. Alternatively, stand completely upright against a wall and measure with a book against the wall. The important thing is to keep it straight so that the distance is accurate.
Inseam in cm × 0.665 = Your frame size
Example: If your inseam is 84 cm, the calculation is 84 x 0.665 = 55.86. Your theoretical size is therefore approximately 56 cm. For gravel, where a somewhat more agile bike is often preferred on technical terrain, round down.
2. Adjust according to Stack & Reach
The formula gives you the height of the frame, but modern geometries vary considerably. To know how the bike actually feels on long-distance rides, we need to look at:
- Stack (Height): Determines how upright you sit. For Touring, a higher stack measurement is often preferred to reduce strain on the back and neck.
- Reach (Length): Determines how stretched out your upper body will be. A shorter reach combined with a suitably long stem often provides the best control on gravel roads.
General guideline for adults
| Height | Inseam (approx.) | Theoretical frame size | Recommended size |
|---|---|---|---|
| 165 – 172 cm | 75 – 79 cm | 50 – 52 cm | Small / 50-52 |
| 172 – 180 cm | 80 – 84 cm | 53 – 55 cm | Medium / 54 |
| 180 – 188 cm | 85 – 88 cm | 56 – 58 cm | Large / 56-58 |
| 188 – 195 cm | 89 – 93 cm | 59 – 63 cm | X-Large / 60-63 |
Are you between sizes?
This is a classic situation for many cyclists. For Touring and gravel, the following logic applies:
You want a more stable bike for heavy loads and a more upright riding position without needing an extreme amount of spacers.
You want a more agile bike for technical trails and prefer a slightly more aggressive (lower) position.
We'll help you with the geometry
Calculating a size is a good starting point, but nothing beats comparing actual geometry charts. If you're unsure, contact us and we'll surely be able to help.