Lyla Lindsey
Cycling is a popular form of exercise in Australia, with around 3.5 million Australians using bikes for transport or recreation. Choosing the right size bike is important, as an ill-fitting bike can lead to knee and back pain, discomfort while riding, and difficulty in reaching optimum performance. The size of a bicycle is often called the frame size or frame height, which usually refers to the length of the seat tube. The size of a bike frame is typically measured in centimetres for road bikes and inches for mountain bikes. For adult bikes, the size of the bike frame is different from that of children's bikes, which are measured by the size or diameter of their wheels. When determining the right bike size, factors such as height, limb proportions, flexibility, and riding style should be considered.
| Characteristics | Values |
|---|---|
| What the bike size indicates | Size of the bike frame |
| How is the bike size measured | In CM, inches, or from XXS to XXL |
| What does the size depend on | Height, limb proportions, flexibility, physical strength, and riding style |
| What is the simplest way to determine the correct bike size | Height |
| What is the most accurate way to determine the correct bike size | Leg inseam height and standover height |
| What is the recommended space between leg inseam height and standover height | 2.5cm |
| What is the size of children's bikes measured by | Size/diameter of their wheels |
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What You'll Learn
Measuring frame size
The size of a bicycle frame is a decisive factor in the size of the bicycle as a whole. The frame size is measured differently for adult bikes and children's bikes.
Adult bikes are measured by their frame size, which is usually the distance from the centre of the crank axle to the top of the seat tube. The seat tube is where the seat post is held. The centre of the crank axle is also known as the centre of the bottom bracket, which holds the crank arms together. The frame size is also known as the seat tube length.
Road bikes are typically measured in centimetres, while mountain bikes are generally measured using inches. However, not all manufacturers measure frame sizes in the same way. For example, some measure from the centre of the bottom bracket to the top of the top tube (centre to top) or the centre of the top tube (centre to centre). Many road bikes are sized S, M, L and XL, but these measurements are open to interpretation and can vary between brands.
Mountain bikes are often marked with sizes S, M, L, etc. and their top tube length is not always included in geometry tables.
Children's bike sizes are determined by their wheel size rather than frame size. The wheel size should correspond to the height of the child.
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Bike size by height
When it comes to choosing the right bike size, there are several factors to consider, including your height, riding style, and preference. While standover height is an important consideration for adults, kids' bikes are more about height, inseam, and confidence than age.
Kids' Bike Sizing
The size of kids' bikes is typically defined by the size of the wheels, which generally range from 12 to 24 inches. However, as kids grow at different rates, the best way to get the right size is to have them try out different bikes.
Adult Bike Sizing
For adults, the frame size is crucial and is determined by measuring your height and inseam. Standover height, or the distance between the top tube and the ground when you stand over the bar, is also important. You should aim for at least 2 cm of clearance between your groin and the bar when you hop off the seat.
When measuring your height, stand straight against a wall and use a book or pencil to mark the wall at the top of your head. Then, measure the distance from the mark to the floor. To measure your inseam, stand against a wall and place a book or other object at your crotch, then measure from the top of the object to the floor.
Road bikes are typically sized in centimetres, while mountain bikes are measured in inches or descriptive sizes (small, medium, large). Hybrid bikes can be measured in either centimetres or descriptive sizes.
It's important to note that different brands may have inherent differences in frame sizes, so it's recommended to refer to a bike size chart and consult an expert to ensure you get the right fit.
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Bike size by age
While age is a good indicator of bike size for children, it is not always accurate. This is because children grow at different rates and have different heights. Therefore, it is always best to measure a child's height when determining the right bike size.
Children's bikes are sized according to their wheel size, which directly correlates to the frame size. The diameter of the wheel increases, as does the frame size of the bicycle. The height of the child will help determine the right wheel size and, therefore, the right frame size.
For example, a child who is 38"-48" tall will need a 16" bike, and this size usually fits children aged 3-7 years old. A child who is 42"-52" tall will need an 18" bike, which usually fits children aged 5-9 years old. The smallest size without training wheels is a 20" bike, which usually fits children aged 7-13 years old who are 48"-60" tall.
It is important to note that the child's stride length should also be considered when determining the right bike size. The seat height can be 2"-4" above the child's inseam for better pedalling efficiency. The seat of a balance bike should be set 0.5"-1.5" below the child's inseam, and their knees should be slightly bent while seated on the bike.
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Bike size by wheel size
The size of a bicycle is often referred to as the frame size or frame height. This is the size range that determines the saddle height and your seated position. The frame size is usually measured in CM or inches, or from XXS to XXL.
For adult bikes, the bike size indicates the size of the bike frame. The sizes refer to the tire size for children's bikes, which usually start at 10 inches, with the transition to an adult bike beginning at 26 inches.
When choosing a children's bike, the child's stride length is an important factor to consider. Age information can be used as a rough guideline, but as children vary in height, their stride length is a more accurate indicator of the correct wheel size.
Kids' bikes are defined by the size of the wheels, which generally range from 12 to 24 inches. The size of the bike frame for adults is determined by the rider's height. To measure your height, stand straight against a wall with a book against the top of your head and measure the distance from the bottom of the book to the floor.
It is also important to measure your inseam, which can be done by standing against a wall and measuring from a book placed at your crotch to the floor. If you are in between sizes, you can consider measuring your reach by extending your arms and measuring the span from the tip of one middle finger to the other.
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Bike size by riding style
The size of a bicycle is often referred to as the frame size or frame height. This is the size range in which adjustments can be made to the saddle height and the rider's seated position. The frame size also determines the overall length and height of the bike, as well as its riding comfort and handling characteristics.
While the height of the rider is not the most precise measure for bike fit, it is the simplest to use when determining the correct frame size. If you are between sizes, you can refer to the geometry tables for more precise details.
Riding style is another factor that influences the correct frame size. For example, if you are looking for a playful and agile riding style for fast corners on a mountain bike, you would want a different frame size than if you preferred a comfortable riding style for long rides with your MTB or touring bike.
- Stand against a wall in a straight position without shoes to measure your height.
- Measure your arm length by taking a tape measure and measuring from this point to your wrist.
- To determine correct inseam measurements, stand with your back to a wall with your bare feet approximately 150mm apart. Place a book or carpenter's square between your legs and pull it up firmly to your crotch. Have a helper measure from the top of the book to the floor in centimetres.
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Frequently asked questions
The size of a child's bike is usually determined by the size or diameter of its wheels. Age information can be used as a rough guideline, but as children vary in height, it's best to measure the child's height and stride length to determine the perfect bike size.
The size of an adult's bike is usually determined by the size of its frame, which is measured in centimetres for road bikes and inches for mountain bikes. The height is the easiest way to determine the correct size, but you can also measure your leg inseam and arm length.
The standover height is the distance between your leg inseam height and the height of the top tube of the bike frame. There should be about an inch (2.5cm) of space between the two measurements. This measurement is important because it determines whether you can stand comfortably over your bike.
