Bicycle Sizing Guide
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Dive into our comprehensive bike sizing guide, designed to simplify the process of finding the perfect fit for every rider. From deciphering how bikes are sized to tailoring the ideal match for men, women, and kids, our article is your go-to resource. While nothing beats the expertise of a bike shop, our guide serves as a roadmap to understanding where you stand in the world of bike sizing.
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There is a tonne of info here. Just keep reading.
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Navigating bike sizing can be a bit tricky at times, given the absence of a universal measurement system applicable to all bike types and riders alike.
Whether you're in the market for an adult bike, a children's bike, a road bike, or a mountain bike, determining your frame size or wheel size is essential.
While we always advocate for visiting your neighborhood bike shop for personalized assistance, this guide offers size charts and valuable information to aid you in finding the perfect fit for your needs.
Kids vs Adult bikes
In essence, adult bikes are sized based on the frame, whereas kids' bikes are sized according to the wheel diameter.
This means there are two distinct measurement systems for adult and kids' bikes. While children may eventually transition to smaller adult bikes as they grow, typically, those aged 12 and under will find bikes sized by wheel diameter most suitable for them.
Road bike sizing vs mountain bike sizing
Adding to the complexity, sizing can also differ between various styles of bikes or among manufacturers. For instance, road bikes and mountain bikes frequently employ different size designations.
In the past, bike size was typically determined by measuring specific components such as the seat tube. However, as bike geometries evolved significantly over time, manufacturers opted to update their measurement systems to enhance clarity for consumers. Despite these efforts, some companies continue to adhere to older systems, contributing to the potential confusion surrounding bike sizing.
Fun(ish) Facts
Below, we've provided size charts for road bikes, mountain bikes, hybrid bikes, and kids bikes. It's crucial to understand that there isn't a one-size-fits-all bike chart applicable to all brands or styles. Slight variations in sizing exist among different bike manufacturers. However, the charts below serve as a helpful starting point in determining the right size for you.
Road Bikes
When it comes to road bikes, frame sizes are typically denoted in centimeters. If you're examining a road bike and unsure of its size, begin by measuring the seat tube. This measurement will provide you with a rough estimate of the bike's size.
In-between sizes?
If you find yourself between road bike sizes on our chart and are uncertain which direction to take, consider the following:
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Size up on a road bike if:
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You have long arms, indicated by a wingspan larger than your height.
Size down on a road bike if:
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You prioritize a bike that's lighter and stiffer, which is often favored by sprinters.
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You prefer an upright riding position.
Mountain Bikes
Mountain bikes are typically measured either in inches or, more commonly, according to a consumer-friendly Small/Medium/Large hierarchy. Sizing newer mountain bikes can be challenging without the assistance of a sticker or stamp on the frame. This is because bike geometries have evolved significantly in recent years, making traditional measurements of tubes less informative.
Wheel sizes and your height
When choosing the wheel size for your next mountain bike, you'll want to take your height and your preferred riding style into account. It's true that smaller riders often feel more in control on smaller wheels, but depending on your level of experience and the desired ride characteristics, that may or may not be the best way to go for your specific goals. If you're a beginner, go with the first option on the suggested wheel size portion of the above chart. If you're an advanced rider, you might consider the other listed option and decide which wheel size will suit your riding style best. As a rule of thumb, larger wheels have faster top speeds and roll over obstacles easier, while smaller wheels are more maneuverable and "playful". If your trail priorities are speed and efficiency, go with a larger wheel size. If your priorities are agility and playfulness, you might really enjoy a smaller wheel size.
In-between sizes?
If you find yourself between mountain bike sizes on our chart and are unsure which direction to take, consider the following:
Size up on a mountain bike if:
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You're a more aggressive rider who values a longer reach.
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Stability on descents is more important to you than maneuverability.
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You prefer riding over and through obstacles rather than around them.
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Your wingspan exceeds your height.
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You're flexible and adept at adjusting your body to terrain.
Size down on a mountain bike if:
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You prefer to ride in a more upright position.
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Your riding style leans towards conservative rather than aggressive.
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Maneuverability is prioritized over the ability to plow through obstacles.
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You are less flexible and tend to maintain a consistent riding position.
Why is there no consistency
In the early stages of mountain biking, sizing MTBs based on the lengths of their seat tubes was common practice. This method provided a reasonable estimate of the bike's standover height. It was effective when frame design was relatively straightforward, featuring top tubes and geometries similar to road bikes.
However, as mountain bike design evolved, manufacturers explored new ways to enhance performance, resulting in longer, more sloped top tubes and designs compatible with dropper posts. These innovations, combined with increased variations across brands, rendered the seat tube length less reliable for approximating a bike's size. Consequently, brands began to develop their own sizing methods to address these changes.
Hybrid Bike
Hybrid bikes, such as commuters and fitness bikes, are excellent all-around options known for their versatility and affordability. Many hybrid bikes utilize a Small/Medium/Large measurement system, although some companies may still use inches to denote size.
In-between sizes?
Opt for the larger size if:
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You possess long arms (with an arm span exceeding your height) or long legs.
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The larger size features larger wheels, and you prefer riding with larger wheels.
Opt for the smaller size if:
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You have a longer torso but an average or shorter arm span/inseam.
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You experience discomfort in your hips, back, or other mobility issues.
Kids Bikes
As mentioned earlier, kids' bikes are sized according to the diameter of their wheels, making the process much more straightforward compared to adult sizing. For instance, a 12-inch bike features 12-inch wheels, a 16-inch bike has 16-inch wheels, and so forth.
In-between sizes?
Opt for the larger size if:
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Your child feels confident riding the larger size.
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They're showing interest in racing or biking as a sport.
Opt for the smaller size if:
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Your child is less confident as a rider.
While it's generally advisable to size up with kids' bikes, ensure they can handle the larger size comfortably. Children grow rapidly, and as a parent, you'll want to provide them with a bike they can ride for several years, not just one. However, there are exceptions to this rule. Going too big may result in difficulty controlling the bike, posing safety risks and reducing enjoyment. Kids typically become better riders when they feel confident on their bike.
Fun(ish) Facts
Should your feet touch the ground on a bike?
When you're on a bike, ideally, you want to be able to touch your toes to the ground while sitting on the seat. But if your feet are flat on the ground, chances are your seat is too low. Having a low seat can lead to all sorts of discomfort and make your pedaling less efficient.
Now, if you're the type who feels more comfy with both feet planted firmly on the ground, you might want to check out Electra bikes. They've got something called Flat Foot Technology. It's a nifty frame design that shifts the pedals forward, giving you proper leg extension while pedaling but still letting you keep your feet flat on the ground whenever you feel like it.
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Should your legs be straight when riding a bike?
When pedaling, you don't want your leg to be completely straight on the downstroke, but you also don't want it excessively bent. As mentioned earlier, aim for a 15-20° bend in your knee during the downstroke. Another approach is to adjust your seat so that your heel can reach just below the pedal axle.
Keep in mind that this is all subjective. The most crucial aspect is finding what feels right for you and your riding style.
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Do I need a 26" or 29" bike?
In the past, 26-inch wheels were the standard for mountain bikes. However, in today's market, you'll find that most mid and upper-tier mountain bikes are equipped with either 29-inch wheels or slightly smaller 27.5-inch wheels. These larger wheel sizes, known as 29ers and 27.5+, offer faster top speeds and smoother rollover of obstacles compared to 26-inch wheels. If you enjoy off-road riding, you'll likely appreciate the benefits of these larger tires.
That said, 26-inch wheels still have their place, especially for kids who have outgrown their 24-inch kids' bikes but aren't quite ready for the larger wheels typically found on adult bikes. They offer a suitable transition size for young riders.
Good read right?
As a reward.
Here is an interesting picture.
