Let's go and see the sizes in the world of cycling, or rather off-road, since in the road world we tend to think in cm (52cm-54cm-56cm).
CLASSIC MTB SIZES
Here is the classic wording of MTB sizes, i.e. from XS to XXL (XXL is a size that few brands offer, as well as XS, although to a greater extent than XXL). Secondly, there are inches, a unit of measurement used by some brands, such as Trek for example.
| XS | S | M | |
|---|---|---|---|
| Measure in inches | 13.5 | 15.5 | 17.5 |
| Recommended height | 147-155 cm | 155-165 cm | 165-175 cm |
| L | XL | XXL | |
|---|---|---|---|
| Measure in inches | 19.5 | 21.5 | 23 |
| Recommended height | 175-185 cm | 185-195 cm | 195-203 cm |
EXPLANATION SPECIALIZED SIZES
And then there is Specialized, one of the most iconic brands in the bike world. Since it can often happen to be in the middle between 2 sizes, we think for example of a height around 1.75 which leads us to be undecided between size M or L (with the due differences from brand to brand in terms of geometry), Specialized has decided to think about the concept of stability and maneuverability, leaving the customer the choice between one size or another, without necessarily precluding it.
For example: if you are 173 cm tall, you could use an S2, S3 or S4. In case you are looking for a balanced ride between maneuverability and stability, you will choose the S3. If, on the other hand, you prefer very agile driving, the S2 is better. If you need a bike that is stable at speed you will take the S4.
Choosing the size of the bike, then comes the most difficult aspect. I link to the article below.
How to adjust saddle height and bike length
