Bike info

How Bike Frames are Measured?

Bike frames are measured in a few different ways. The most common way is by the seat tube length. A seat tube refers to the tube that goes from the bottom bracket up to the saddle. Seat tube length s the distance from the center of the bottom bracket to the top of the seat tube. Other measurements include the top tube length and stem length.

The frame size is usually listed as the seat tube length. For example, a 54cm frame has a 54cm seat tube. Another way bike frames are measured by top tube length.

The top tube is the horizontal tube that goes from the head tube to the seat tube. Bike sizes are also sometimes listed as top tube lengths. For instance, a 56cm frame has a 56cm top tube.

The bike frame’s geometry affects how it rides, so it’s important to choose a frame that will fit your riding style. If you’re looking for a racing bike, you’ll want a lightweight and aerodynamic frame. For mountain biking, you’ll want a durable frame that can handle rough terrain.

And if you’re just cruising around town, any type of bike frame will work fine. When shopping for a new bike, trying out different frames is important to see what feels best for you. And don’t forget to measure your inseam before buying.


What Does a 26-Inch Bike Frame Mean?

A 26-inch bike frame is the most common size for adult mountain bikes and is suitable for riders between 5’0” and 6’0” tall. The frame size is measured from the bottom bracket’s center to the seat tube’s top. A 26-inch frame will have a wheelbase (the distance between the front and rear wheels) of approximately 42 inches.

Mountain bikes with 26-inch wheels are typically lighter and more maneuverable than their 29er counterparts, making them a good choice for cross-country riding or singletrack trails.

What Does 20-Inch Bike Frame Mean?

A 20-inch bike frame is the size of the frame from the top of the headtube to the center of the bottom bracket. Most mountain bikes have a 19-21 inch frame, which is ideal for most riders. The smaller frames are easier to maneuver on technical trails and tight switchbacks, while the larger frames offer more stability at high speeds.

If you’re unsure what size frame you need, it’s best to consult with a local bike shop or test ride a few different sizes before making your final decision.

How Do You Measure a 21-Inch Bike Frame?

Assuming you don’t have a tape measure on hand, there are a few other ways to measure your bike frame. If you have access to a ruler or yardstick, you can measure the distance between the top and bottom of the bike frame. Simply place the ruler or yardstick horizontally across the top of the bike frame and make a mark at the 21-inch point.

Then, do the same thing from the bottom of the bike frame. The distance between your two marks is the height of your bike frame. Another way to measure your bike frame is by using a piece of string or yarn.

Again, place this horizontally across the top of the bike frame at 21 inches and make a mark. Then, do likewise from the bottom of the bike frame. Finally, measure the length of the string or yarn between your two marks, which will tell you how tall your bike frame is.

What Size is a 17 Inch Bike Frame?

The average 17-inch bike frame size is approximately 18.5 inches tall and 24.5 inches wide. However, there is no definitive answer, as frame sizes can vary based on the manufacturer and type of bike. For example, a mountain bike frame may be smaller than a road bike frame of the same size.

If you are unsure what size frame to get, it is best to consult a local bike shop professional.

How to Measure a Bike Frame to Your Height

Bike sizing is one of those things that are notoriously difficult to get right. But with a few simple measurements, you can surely get the perfect fit for your new bike. Here’s how to measure a bike frame to your height:

  1. First, stand up straight against a wall and measure from the floor to the top of your head. This is your total height.
  2. Next, measure your inseam – that’s the distance from your crotch to the ground.
  3. To find out what size bike frame you need, subtract your inseam measurement from your total height measurement. The resulting number will correspond with certain bike sizes (for example, if you’re 5’5″ tall with a 30″ inseam, you’ll need a small-sized bike).
  4. Once you have an idea of which size bike frame you need, it’s time to start testing out bikes. Get on each one and see how it feels – does it feel comfortable? Is it too big or too small? Etcetera. By doing this, you’ll eventually find the perfect-sized bike for you.


Bike frames are measured in a number of ways, including seat tube length, top tube length, and standover height. There are a few different methods for measuring bike frames, but the most important thing is to make sure that you get the right size frame for your body type. Seat tube length is the measurement from the bottom bracket’s center to the seat tube’s top.

The top tube length is the measurement from the head tube to the seat post. Standover height is the measurement from the ground to the top tube’s top. You can use these measurements to help you choose a bike frame that will fit you well.