Bike Size Chart
The Bike Size Chart is a sizing reference tool covering bike size chart, bicycle size chart, mountain bike size chart, road bike size chart. Use the chart below to look up values instantly. Printable and downloadable versions are available on this page.
Road Bike Size Chart
Road Bike Frame Size Chart by Rider Height
| Rider Height (ft/in) | Rider Height (cm) | Frame Size (cm) | Size Label | Notes |
|---|---|---|---|---|
| 4'10" to 5'1" | 147 to 155 cm | 44 to 46 cm | XXS | Very small frame — limited availability |
| 5'1" to 5'3" | 155 to 160 cm | 46 to 48 cm | XS | — |
| 5'3" to 5'5" | 160 to 165 cm | 48 to 50 cm | S | — |
| 5'5" to 5'8" | 165 to 172 cm | 50 to 54 cm | M | — |
| 5'8" to 5'11" | 172 to 180 cm | 54 to 56 cm | M/L | — |
| 5'11" to 6'1" | 180 to 185 cm | 56 to 58 cm | L | — |
| 6'1" to 6'3" | 185 to 190 cm | 58 to 60 cm | XL | — |
| 6'3" to 6'5"+ | 190 to 196+ cm | 60 to 62 cm | XXL | Tall frame — measure inseam for precise fit |
Source: Road bike sizing conventions — Trek, Specialized, and Giant manufacturer guidelines
Mountain Bike Size Chart
Mountain Bike Frame Size Chart by Rider Height
| Rider Height (ft/in) | Rider Height (cm) | Frame Size (inches) | Size Label | Suggested Wheel Size |
|---|---|---|---|---|
| Under 5'2" | Under 158 cm | 13 to 14 inches | XS | 26 inch or 27.5 inch |
| 5'2" to 5'6" | 158 to 167 cm | 15 to 16 inches | S | 27.5 inch or 29 inch |
| 5'5" to 5'9" | 165 to 175 cm | 17 to 18 inches | M | 27.5 inch or 29 inch |
| 5'8" to 6'0" | 172 to 183 cm | 19 to 20 inches | M/L | 29 inch |
| 5'11" to 6'2" | 180 to 188 cm | 21 to 22 inches | L | 29 inch |
| 6'1" to 6'4" | 185 to 193 cm | 23 to 24 inches | XL | 29 inch |
| Above 6'4" | Above 193 cm | 25 inches and above | XXL | 29 inch |
Kids' Bike Size Chart by Age and Height
Children's Bike Size Chart — Age, Height, and Wheel Size
| Child Age | Child Height (inches) | Child Height (cm) | Wheel Size | Notes |
|---|---|---|---|---|
| 2 to 3 years | 28 to 38 inches | 71 to 97 cm | 12-inch | Balance bike recommended at this stage |
| 3 to 4 years | 36 to 40 inches | 91 to 102 cm | 14-inch | First pedal bike |
| 4 to 6 years | 38 to 44 inches | 97 to 112 cm | 16-inch | Most common first pedal bike size |
| 5 to 8 years | 44 to 52 inches | 112 to 132 cm | 20-inch | Good for learning gears |
| 8 to 11 years | 50 to 58 inches | 127 to 147 cm | 24-inch | Junior trail and road bikes |
| 10 to 14 years | 56 to 62 inches | 142 to 158 cm | 26-inch | Near adult sizing |
| 12 years and above | 58 inches and above | 147 cm and above | Adult sizing | Use adult chart above |
How to Measure for Bike Size
1
Measure your inseam Stand barefoot against a wall with feet 6 inches apart. Place a large hardcover book level between your legs at crotch height (simulating a saddle) and measure from the floor to the top of the book in centimetres.
2
For road bikes — multiply inseam by 0.70 Multiply your inseam by 0.70 to estimate ideal saddle height from the bottom bracket centre to the top of the saddle. This guides frame size selection.
3
For mountain bikes — multiply inseam by 0.66 Multiply your inseam by 0.66 to estimate saddle height. Mountain bikes use a lower position for more aggressive technical riding.
4
Check standover clearance When standing over the top tube flat-footed you should have at least 1 to 2 inches clearance for road bikes and 2 to 4 inches for mountain bikes.
Bike Size Calculator
Enter your height, inseam, and bike type to get a recommended frame size, standover height estimate, and saddle setup guide.
Frequently Asked Questions
What size bike do I need for my height?
Use the height charts above to find the recommended frame size for your height. Height is a good starting estimate — but inseam measurement provides a more accurate fit, especially for riders who are tall with shorter legs or short with longer legs.
What mountain bike size for a 6-foot person?
A 6-foot rider typically fits a Large frame (21 to 22 inches) in mountain bikes. Verify by checking standover clearance and reach to the handlebars — different brand geometries can vary by one size.
What is the difference between 27.5 and 29-inch wheels?
A 29-inch wheel rolls over obstacles more easily and maintains speed better on rolling terrain. A 27.5-inch wheel is lighter, more agile, and more suitable for technical terrain and shorter riders who find 29-inch wheels unwieldy.
How do I measure bike frame size?
Road bike frame size is measured from the centre of the bottom bracket (the axle hole at the bottom of the frame) to the top of the seat tube in centimetres. Mountain bike frame size uses the same measurement but is typically expressed in inches.
What age is a 20-inch bike for?
A 20-inch wheel bike is generally suitable for children aged 5 to 8 with a height of approximately 44 to 52 inches. It is the standard size for teaching gears and hand brakes.
Can a bike be too big for me?
Yes — a frame that is too large causes you to overreach to the handlebars straining your back and reducing control. The standover height should give at least 1 inch of clearance when straddling the top tube flat-footed.
Is a balance bike better than a bike with training wheels?
Research and cycling educators strongly favour balance bikes over training wheels for children aged 2 to 4. Balance bikes develop the core skill of balancing directly — children who learn on balance bikes typically transition to pedal bikes much faster and more confidently than those who used training wheels.
What is the most popular mountain bike wheel size?
29-inch wheels have become the dominant choice for cross-country and trail mountain biking among adult riders. They offer better traction, rollover capability, and speed efficiency on most terrain compared to 27.5-inch wheels.