Full Suspension Carbon MTB Frame MFM100 is one of our best mountain bike frames, it is also a 21-inch frame mountain bike, the main thing is that it is a trail frameset; it is equipped with a Trunnion rear shock frame, internal alignment design, we deliberately offset the position of the rear shock, so that the structure of the bike can be smooth.

Bad news: mountain bike frame size is all over the place. There is no consistency. One brand’s Medium/17in bike is another brand’s Large/19in. What’s more, a lot of bike manufacturers’ – and even bike shops’ – sizing advice is often wrong too.

The best place to start when trying to choose the right size mountain bike is by looking at a size chart. Our bike size chart here is a good baseline, helping you find the right size bike for your height. We also recommend looking at the size chart that is specific to the brand you are looking at due to differences in design philosophy and geometry. On each of our mountain bike product pages, we have the size chart for that brand. While the size of the bike frame is a good starting point, there are other factors, like geometry, intended use, and skill level that factor in choosing the right size bike – we’ll cover these below.

Most mountain bike manufacturers use classic Small, Medium, and Large sizing. For the most part, bike frame size is the only thing that changes when you go between sizes – things like wheel size, suspension, and relative geometry number remain the same. However, some manufacturers will change things like wheel size and suspension travel across the size run of the same model.

To sum up: If you like a more nimble and whippy ride, are a bit less flexible, are shorter in the torso or are looking for a more casual riding position, size down your mountain bike.

For more information about mountain bike frames, please check our official website.