- BSX Insight
Bicycle frames come in various shapes and sizes, so it can be tricky to know how to measure bike frame correctly. This article will discuss the best ways to measure a new bike frame and explain why each method is essential. We will also provide tips for choosing the right frame size for your body type.
If you’re looking for the traditional sizing method, you’ll need to tape measure the length of the seat tube. To determine your bike’s frame size using geometric measurements, you’ll need to measure the wheelbase and chainstay length.
- 1 What Are The Guaranteed Ways In Measuring A Bike Frame Effectively
- 2 Finding The Right Size for Your Bike
- 3 Measuring Other Tubes – How To Measure Bike Size
- 4 Conclusion
What Are The Guaranteed Ways In Measuring A Bike Frame Effectively
1. What You Need
A classic example of this is a cyclocross bike. A tape is an option. The bike frame size is equal to the length of the seat tube length in cm.
2. Measurements for a Bike Frame
Measure the right bike frame size by starting at the center of the tool crank and moving up to the upper portion of the seat tube. The tape measure’s tip should be positioned at the exact midpoint of the crank on your bike.
Then, you can run the measuring tape along the tube’s ends and measure a bike frame from there. This will determine the length of the top tube and the bike size of the frame. You can also remove your bike seat from the top pipe to make it easier.
A typical length for a seat tube length is 21 to 23 inches or 53 to 58 cms.
You may decide to buy a bike frame that is the right size for you after measuring it. Knowing your height and inseam length/inside legs can help you decide if it’s right for you. These measurements are often used to create bike size charts.
It is easy to measure your inside leg. It is quite simple if you are familiar with the process. Measure the distance from the ground to your crotch. While measuring, make sure your legs are straight, and your feet are not touching the ground. Next, spread your legs out to approximately six to eight inches (or 15 to 20cm).
To measure this distance, you can use a tape measure. Make sure you measure a bike frame in your actual crotch area, not your pants. To get the correct length, measure the bike frame to your height.
Once you have your inseam length in centimeters, you can multiply it to get the perfect seat tube length. Below are instructions for various bike types.
When measuring your height, make sure you have taken your shoes off and are standing straight up against a wall. To mark your head tube on the wall, you can use a pencil. Next, measure the height with tape. You can then measure the gap between the plumb line’s top area and the head tube. This will give you the reach measurement.
3. Road Bike Frame Size
Road bikes are famous for their centimeter measurement. Americans may struggle with these sizes because they use imperial units. This one is simple to deal with.
Multiply the length in inches with 2.54. The correct measurement will be in centimeters.
Road Bikes are one the most important types of bikes. The saddle of a road bike size might be where we spend most of our time. Our comfort and performance are affected by how we ride.
To get the length of your seat tube, multiply your inseam length by 0.7. There is a high chance that you will have difficulty pedaling if your seat tube is the same length as your inseam.
It is possible to reduce the measurement by multiplying it by 0.7. This makes it suitable for streamlined road bikes. This will allow you to ride uphill and take long trips without difficulty.
4. Mountain Bike Frame Size
Mountain bike frames are measured in inches. Mountain bicycles have smaller bike frames than road bikes. The riders have incredible control and can maneuver the professional bike fit on any terrain.
Mountain biking require that you multiply your inseam length by 0.66. These bikes have thicker, bulkier tires. Mtb is a more aerodynamic and sleeker bike than a road bike.
It is multiplying the inseam length with a smaller number to get the correct size bike. This can be done with a calculator or even a smartphone.
5. Mountain Bike vs. Road Bike
If we compare mountain bikes with road bikes, the difference is how they are sat. MTBs allow you to sit higher up, with your arms spaced further apart. This causes your weight to lean more towards the back.
Mountain bikes are ideal for riding style on rough roads or other rocky terrains because of this feature.
Finding The Right Size for Your Bike
It’s normal for you to feel awkward when measuring bike sizes. Balancing can be a challenge, as you might fall over. Asking for help from friends and/or partners is a great idea.
Once you have measured the bike size frame, you can buy the perfect road bike frame. Make sure that your calculations are correct. You will get the right size bike fit based on the numbers you calculated.
Before buying, you can test drive your bicycle. You can also test it out before you buy. You can ride it around the park or on any other large lot. Adjust the seat until your leg bends when you push the pedal down.
You can always test other measurements if you feel uncomfortable reaching the pedals.
Kid and Junior Bikes
A child’s bicycle is a completely different type of bike, as it has wheels that range from 12 to 26 inches in length. For every junior bicycle, you need to leave a minimum of 2 inches clearance between the head tube and the top tube.
However, smaller bikes with a maximum front wheel size of 20 inches or less would have a naturally narrow stand-over height. This might vary slightly from one manufacturer to another as some frames are measured from the middle of the top tube.
This video will provide more details on how to measure a bike frame.
Measuring Other Tubes – How To Measure Bike Size
The Saddle Tube
People are often curious about the seat tube, which I mentioned earlier. What is a seat tube exactly? The seat tube is the long pipe that connects to your bike’s saddle. You will see a glued label indicating the bike size frame in the area surrounding this tube.
It can be seen between the chain sprocket and three inches (7.6 cm). But not all road bikes have the ability to label their bike size. This is where manual measurement becomes necessary.
Inches and centimeters are the two types of measurement. The usual size of a bike is 48 cm to 62cm. For smaller riders, the lower range is used for taller bikers.
Measuring Top Tube Length
Bicycles had horizontal top tubes that were uniformly horizontal in the past. Today, most mountain bikes have a sloping effective top tube length.
How to measure effective or virtual top tube length? To measure the effective top tube of your bike you’ll need to stand it up straight on a level surface. Then take a long straight rule and a spirit level.
A bike geometry table can be used to determine the exact length of a bicycle’s top tube length. If you need a reliable and steady measure, you will also need to calculate the horizontal cap virtual top tube length. This is the horizontal gap between the centerline of your head tube and the seat post.
This can be done by using your spirit level or the clinometer app. This will ensure that your measured line is horizontal.
Stack and Reach
Manufacturers usually identify the stack and reach the values of each bicycle. These values have the advantage that they are not related to the design of the frame. They can also measure vertical distances between the two main contact points, the head tube’s top and bottom bracket areas, and the bottom bracket.
The horizontal distance between them is called the reach. To measure it, you would need your spirit level. A plumb lining can be placed at the level’s ends. You should ensure that the string’s end is straight and has a symmetrical blob. You may have to adjust your measurements if you don’t do this.
You can then line up your upper edge with the middle line at the top of your bike’s head tube. Move the line slowly to ensure that the plumbing line intersects the middle of your lowest bottom bracket spindle.
The gap between the top of the plumb line and the head tube can be measured. This will give you the reach measurement.
There are many features of any given bike frame that may make it fit differently than another. A good example of this is the bottom bracket drop. A more useful measurement is the bottom bracket drop. This describes the position of the bottom bracket relative to the bike’s axles.
The relative position of the bottom bracket centre in a frame’s geometry will affect the sizing considerably. Touring bikes have lower bottom brackets than track bikes one gives you comfort and stability, the other ensures you don’t slap a pedal on 44-degree banking.
Measuring the Angles of Head Tube and Seat Tube
Next, we’ll be discussing the head tube angles and seat tube angles. These are two crucial factors in smooth handling. A more upright position will usually result in more agile handling. This area would be ideal for a clinometer app.
It is easy to measure the angle of your bike’s seat tube if you have a straight seat tube. This can be done by placing your phone on the table and reading the number from the clinometer app. Make sure the bicycle is upright. For a better analysis, it is best to place the bicycle on a horizontal surface.
You will need a straight, flat rim to follow the lining line between your saddle tube’s top and bottom bracket. This is where you can align your smartphone.
What if I don’t have a bike that fits me?
If you don’t currently have something that works for you, your best bet is to go back a few paragraphs and visit your local bike shop. The refrain: bike shops are good. Their main goal is to get you a bike fitting. They’ll use their magic, or their Fit Kit, or their in-house designed system, their Serotta FitCycle, or they’ll have Aunt Betty eyeball you.
There are a few factors to consider when choosing the best way to measure a suitable bike frame size for you. Your height, inseam, and leg length are all important considerations when it comes to finding the right frame size. You’ll also want to think about the type of cycling you’ll be doing, as this can affect the bike size you need. BSX Insight will ensure that you are comfortable while riding and do not experience any pain or discomfort.