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WHY ARE BIKE SIZING CHARTS SO INACCURATE?

Updated: Nov 21, 2023

Are You Riding the Wrong-Sized Bike? The Flaws of Sizing Charts




Intro

Have you ever purchased a bike based on its size chart, only to find that it doesn't quite fit you? You're not alone. Despite their seemingly precise measurements, bike sizing charts can often be inaccurate and lead to riders choosing the wrong-sized bike. In this blog post, we'll explore the flaws of bike sizing charts and why they may not always provide the best guidance for finding the perfect fit. So if you've been struggling with discomfort or performance issues while riding, keep reading to see if your bike's size could be the culprit.


The Problem with Bike Sizing Charts: A Detailed Look

Bike sizing charts have long been relied upon as the go-to resource for determining the perfect fit. However, these charts are not as accurate as they may seem. The problem lies in the fact that they rely solely on a few basic measurements, such as height and inseam length, to determine the appropriate frame size. This oversimplification overlooks the many other factors that contribute to a comfortable and efficient ride.

For example, different body proportions can greatly impact how a bike fits, yet sizing charts fail to account for these variations. Additionally, personal preferences and riding style are not taken into consideration. Riders who prefer a more aggressive or upright position may need a different size than what the chart recommends.

Furthermore, sizing charts do not consider the vast differences in bike geometry and design. A bike with a steep seat tube angle may fit differently than one with a slacker angle, even if the frame size is the same.

All these factors combined result in riders often choosing the wrong-sized bike based on the recommendations of sizing charts. This can lead to discomfort, poor performance, and even injury.

In the next sections, we will explore case studies of riders who have experienced issues with ill-fitting bikes, as well as provide practical tips and advice on how to determine your true bike size. Stay tuned to find out if your bike's size could be the culprit behind your riding woes.


Case Studies: Stories of Riders on the Wrong Sized Bikes

One rider, Sarah, purchased a bike that was recommended by the sizing chart based on her height and inseam length. However, she quickly realised that the bike felt too cramped and uncomfortable. She experienced pain in her knees and lower back after every ride. Frustrated, she sought advice from a bike fitting professional who determined that the frame size was too small for her long torso and arms. After switching to a larger frame size, Sarah's discomfort vanished, and she was able to ride longer and faster without any pain.

Another rider, Mark, followed the sizing chart and purchased a bike that seemed to fit him perfectly. However, he soon realised that the bike's aggressive riding position was not suited to his preferences. Mark preferred a more relaxed and upright position, but the chart did not account for this. As a result, Mark experienced discomfort and struggled to maintain good posture while riding. He later realised that he needed a smaller frame size with a more relaxed geometry to accommodate his riding style.

These case studies highlight the limitations of relying solely on bike sizing charts. They demonstrate that personal preferences, body proportions, and riding style must be taken into account when choosing the right-sized bike. In the next section, we will explore practical tips and advice on how to determine your true bike size to avoid these issues.


How to Determine Your True Bike Size: Practical Tips and Advice

When it comes to finding the perfect bike size, relying solely on a generic sizing chart can be hit or miss. To determine your true bike size, it's important to take into consideration a few key factors. First, consider your riding style. Are you a more aggressive rider who prefers a low and aerodynamic position, or do you prefer a more relaxed and upright position? Your riding style will greatly impact the frame size and geometry that suits you best.

Next, pay attention to your body proportions. While height and inseam length are important measurements, they don't tell the whole story. Consider your arm length, torso length, and leg length in relation to each other. If you have a longer torso, for example, you may need a larger frame size to accommodate it.

Lastly, don't be afraid to try different bikes and sizes. Every brand and model will fit differently, even if the frame size is the same.


Rethinking the Standard: Is it Time for a New Bike Sizing Method?

Bike sizing charts have long been the standard for determining the right bike size. However, as we've discussed in this blog post, these charts have numerous flaws and often lead to riders choosing the wrong-sized bike. This begs the question: is it time for a new bike sizing method?

Many experts in the cycling industry believe that it is. With advancements in technology and a better understanding of biomechanics, there is an opportunity to create a more accurate and personalised bike sizing method. This could involve incorporating more detailed body measurements, such as arm length, torso length, and leg length, into the sizing process. Additionally, considering a rider's preferred riding style and bike geometry could provide further insight into the perfect fit.

While a new bike sizing method may not be implemented overnight, the discussion is certainly gaining traction. The ultimate goal is to provide riders with a more precise and comfortable fit, ultimately enhancing their performance and enjoyment on the bike. So, as the cycling industry continues to evolve, we may just see a new standard emerge in bike sizing.


So should I have a Bike Fit Before Purchasing a Bike?

When it comes to purchasing a bike, you may be wondering if it's worth having a bike fit before making your decision. The short answer is, yes! Having a bike fit before purchasing a bike can make all the difference in finding the perfect fit and ensuring a comfortable and efficient ride.

A bike fit involves working with a professional who will assess your body proportions, riding style, and personal preferences to determine the best bike size and geometry for you. They will take detailed measurements, analyse your flexibility and riding position, and make necessary adjustments to ensure that the bike fits you perfectly.

By investing in a bike fit before purchasing a bike, you can avoid the frustrations and discomfort that can arise from choosing the wrong-sized bike. A bike fit can help prevent issues such as knee pain, lower back pain, and poor posture while riding. It can also enhance your performance by optimising your riding position and power transfer.

Ultimately, a bike fit is an investment in your cycling experience. It can help you ride with confidence, comfort, and efficiency, allowing you to fully enjoy the sport. So before making your next bike purchase, consider scheduling a bike fit to ensure that you find the perfect bike for you.


So if your looking to buy a new Bike when seriously consider having a Pre-Purchase Bike Fit to ensure the Bike you are considering is the Correct Size for you. New Bikes have got eye wateringly expensive over the last few years, so buying the wrong size could be a very costly mistake.


We here in the Performance BikeFit Studio have had to have that very awkward conversation with clients who have spent in excess of £5000 on a New high end bike only to advise them that the bike is the wrong size and type to match their unique body proportions, Range of movement, flexibility and cycling goals and we don't like having those conversation.



So how can we help?

Here in the Performance BikeFit Studio We have a Bike Fitting Jig, essentially it is an indoor bike with a completely adjustable geometry.


We can use this to determine the perfect geometry of a frame for you, then transfer measurements from the jig to real-life bikes, and help you find the best fitting bike possible before you buy. We can also use the jigs to compare bikes. This is useful if you have a shortlist of bikes you might be interested in, and want to test ride every one of them before you make an expensive purchase.

Alternatively we can provide a Static Sizing Fit, where we take all the essential measurements, load those into our Bike Finder software to find a match for your unique measurements. But bear in mind this is just an initial guide to find Frames that might be able to give you a good fit, but the sure fire way to ensure your chosen Bike Manufacturer & Model is correct for you is to have a Pre-Purchase BikeFit on our Bike Fitting Jig as mentioned earlier. So if you are in the market for a new bike, don’t buy anything without contacting us first. We can help you every step of the way.





Many Athletes have used Performance BikeFit to improve their cycling position. Whether you are a veteran or new to the sport, Performance BikeFit can help you improve your position and improve your enjoyment of cycling indoors and Out.


© 2023 Performance BikeFit

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