Factsheet on Bicycle Frame Sizing

Bicycle frame sizing is an essential aspect of selecting the right bike for your body. The most important body measurements for determining the correct bicycle frame size are your height and your inseam. While these two numbers alone will not guarantee that a bike is a perfect fit, by using them and a sizing chart, you can eliminate bikes that clearly are too tall or too short for you.

Inseam Length

The inseam length is the distance from the ground to your crotch, measured along the inside of your leg. It is an essential measurement you need to know before purchasing any kind of bike. To find your road bike frame size, take your inseam length in centimetres and multiply it by 0.70. For example, if your inseam length is 78cm, you should look for a road bike frame size that measures 38-39cm (78cm X 0.70).

There are no significant differences between male and female bike frame sizes. The charts above work for both men and women. However, women's frame sizes can vary significantly depending on a brand's outlook on women's bikes. Some brands have women's-specific geometry and women's bike ranges designed from the ground up. As a result, the range of sizes on offer will also be specific to women.

It is important to note that some women may be more comfortable on a "men's" bike and vice versa. So if your body proportions fall outside of the norm, it is best to try out different bikes to find the one that fits your physiology.

Tips for Finding the Right Bike Size

Here are some tips to help you find the right bike size:

1. Know Your Height: While using your height as a guide is one of the easier ways to get an idea of your frame size, it won’t give you a perfect fit. Rather, it’s just a decent way to determine whether the frame will be too short or too tall.
2. Measure Your Inseam: Along with your height, your inseam is the other essential measurement you need to know before purchasing any kind of bike. To find your road bike frame size, take your inseam length in centimetres and multiply it by 0.70.
3. Use a Sizing Chart: Manufacturers have their own bike size charts that will steer you in the right direction. Below are general bike size charts for road bikes and mountain bikes based on height:

• Road Bike:
• 147-152cm: 38-39cm (XXS)
• 152-160cm: 40-41cm (XS)
• 160-170cm: 42-44cm (S)
• 170-178cm: 45-46cm (M)
• 178-183cm: 47-49cm (L)
• 183-191cm: 50-52cm (XL)
• 191-196cm: 53-54cm (XXL)
• Mountain Bike:
• 147-155cm: 14"-15" (XS)
• 155-165cm: 15"-16" (S)
• 165-175cm: 16"-17" (M)
• 175-183cm: 17"-18" (L)
• 183-193cm: 18"-19" (XL)
• 193-198cm: 19"-21" (XXL)
• Get Professional Help: Knowing your fit dimensions and having a fit specialist help walk you through the process not only ensures you are getting the proper size but also a bike for your specific needs.

Bike Frame Size Calculator

Enter your inseam length in cm:

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In conclusion, selecting the right bicycle frame size is crucial for comfort and safety while riding. By measuring your height and inseam length and using a sizing chart, you can find the perfect fit for your body type. Don't hesitate to seek professional help if needed, and remember that finding the right bike size will make all the difference in enjoying your cycling experience!