Mountain biking is a great way to get outside and enjoy the fresh air while also getting a workout. But before you hit the trails, you must make sure you have the right mountain bike for your size and experience level. Depending on your height and weight, you will need a different size bike frame. If you are too small for the frame then you will have difficulty controlling the bike. If you are too big for the frame, the bike will be uncomfortable to ride, and you won’t be able to get full power transfer when pedaling. 

So how do you know which size mountain bike is right for you? There are different sizing for men and women bikers, so we have explained sizing details for both in our guide. Moreover, you will also learn some important geometry terms related to mountain bikes with graphic representation. This will answer your question – What size bike do I need and help you choose the right mountain bike?

Mountain Bike Size Chart for Men

Here is the men’s mountain bike size chart :

Rider Height Suggested Mountain Frame Size
Feet & Inches Centimeters (Inches) (CM) Frame Size
4’10” – 5’2″ 148cm – 158cm 13″ – 14″ 33 – 37 X-Small Bikes
5’2″ – 5’6″ 158cm – 168cm 15″ – 16″ 38 – 42 Small Bikes
5’6″ – 5′ 10″ 168cm – 178cm 17″ – 18″ 43 – 47 Medium Bikes
5’10” – 6’1″ 178cm – 185cm 19″ – 20″ 48 – 52 Large Bikes
6’1″ – 6’4″ 185cm – 193cm 21″ – 22″ 53 – 57 X-Large Bikes
6’4″ – 6’6″ 193cm – 198cm 23″ – 24″ 58 – 61 XX-Large Bikes

Mountain Bike Frame Size Chart for Women

Here is the women’s mountain bike size chart :

Rider Height Suggested Women’s Mountain Frame Size
Feet & Inches Centimeters (Inches) (CM) Frame Size
4’10” – 5’2″ 148cm – 158cm 13″ – 14″ 33 – 37 X-Small Bikes
5’2″ – 5’6″ 158cm – 168cm 15″ – 16″ 38 – 42 Small Bikes
5’7″ – 5’9″ 168cm – 178cm 17″ – 18″ 43 – 47 Medium Bikes
5’10” – 6’1″ 178cm – 185cm 19″+ 48 + Large Bikes

How are Mountain Bikes Measured?

The best mountain bikes are typically measured in two ways: by the frame size and by the wheel size. The frame size is the distance from the top of the frame to the bottom bracket, and it is usually measured in inches or centimeters. The wheel size is the diameter of the wheels, and it is usually measured in inches. There are some best 26-inch mountain bikes whereas some newer models have 27.5- or 29-inch wheels. The frame wheel size can be used to determine the overall size of the bike, which is important when choosing a bike that will fit you well. 

Remember that the seat tube length will give you a good idea of the bike’s overall size, but it’s important to keep in mind that rocky mountain bike often has sloped top tubes, which means that the actual height of the bike may be less than the seat tube length. 

Crucial Geometry Terms in Mountain Bikes 

mountain bike

A. Seatstay

B. Chainstay

C. Seat tube

D. Top tube

E. Down tube

F. Stem

G. Head tube

What size mountain bike do I need?A. Effective top tube length  

B. Stack height  

C. Seat tube length  

D. Down tube length  

E. Bottom bracket drop  

F. Bottom bracket height 

G. Wheelbase  

H. Front center

Right Mountain Bike Size

A. Effective seat angle

B. Actual seat angle

C.  Head angle

Tips for Choosing the Right Mountain Bike Size

You can apply these tips on whichever model you like ranging from Best mountain bike under 600 dollars to Best mountain bike under 2000 dollars. Here are the tips for finding the right mountain bike size chart by height:

1. One method is to simply consult a size chart. These charts can be found online (above) or at your local bike shop, giving you a good starting point for finding any bike be it best hybrid bikes or the best full suspension mountain bike. You can find the right size for you anytime.

2. Another way to determine what size mountain bike you need is to take your own measurements. First, measure your inseam, which is the distance from your crotch to the ground. Then, compare this measurement to the standover height of the bikes you are considering.

The standover height is the distance from the frame’s top tube to the ground. You should have at least 2-3 inches of clearance between your inseam and the standover height of the bike; any less than this and you run the risk of being too cramped on the bike or having your legs hit the pedals when you’re riding.

3. Once you have determined what size mountain bike you need, it’s time to start test riding! This is the best way to find a bike that feels comfortable and suits your riding style. Most bike shops are happy to let you take a few different models out for a spin, so don’t be afraid to try out a few before making your final purchase for the right mountain bike size for height.

Some Last Words

When it comes to mountain biking, there is no one-size-fits-all answer to the question of what size bike you need. If you are not convinced with the online chart (which is rare), then you can determine the appropriate size by visiting a mountain bike shop and speaking with a professional about your height, weight, and riding experience. Also, if you drive on long journeys and carry your bike frequently, make sure to invest in a quality bicycle hitch rack.

General guidelines suggest that beginner riders should start with a smaller bike and work their way up as they gain more experience. Experienced riders may prefer a larger frame that offers more stability and control. Ultimately, it’s up to the individual rider to decide what size mountain bike works best for them.

Frequently Asked Questions

Q1. A 26 inch mountain bike is good for what height?

Some best 26 inch mountain bikes work for riders between 4’10-5’7, or 147 cm to 170 cm. This size is also ideal for riders with leg inseams 25-30 inches, or 63-76 cm.

Q2. A 27.5 inch mountain bike is ideal for what height?

Some best 27.5 inch mountain bikes are ideal for riders between 5’2″ and 5’10”. It means adults of all heights can conveniently ride this size bike. However, some reputed brands even claim that their 27.5″ wheels are designed for riders 5’7″ and under.

Q3. What size bike do I need?

You can check out the chart above and estimate what size bike will be suitable for you. Simply consider your age and check the measurements of the bike. After that, it will become easy to buy the right size bike.


I am David, one of the best contributing tech editors. I have written more than a million words about thousands of bikes and equipment. To make sure my hobby turned profession inspires others, I have also penned 3 bike-related books and have given interviews to many YouTubers.