Bike size chart
A rider of 5 ft 7 in to 5 ft 10 in (170 to 178 cm) fits a 54 cm road frame or an 18 in mountain bike frame on BikeRadar's chart. Your height is the starting point; these are guidelines, so a test ride settles it.
Bike size chart: the tool
Bike size by height
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How to measure
Bike frame size chart: road bikes by height
| Rider height | Road frame | Mountain frame |
|---|---|---|
| 143 to 155 cm (4'8" to 5'1") | 44 cm | 13 in |
| 155 to 163 cm (5'1" to 5'4") | 48 cm | 15 in |
| 163 to 170 cm (5'4" to 5'7") | 51 cm | 16 in |
| 170 to 178 cm (5'7" to 5'10") | 54 cm | 18 in |
| 178 to 183 cm (5'10" to 6'0") | 56 cm | 19 in |
| 183 to 191 cm (6'0" to 6'3") | 58 cm | 20 in |
| 191 to 196 cm (6'3" to 6'5") | 60 cm | 21 in |
| 196 to 205 cm (6'5" to 6'9") | 62 cm | 22 in |
Mountain bike size chart (S to XXL)
| Rider height | Size | Frame |
|---|---|---|
| 148 to 158 cm (4'10" to 5'2") | XS | 13 to 14 in |
| 159 to 168 cm (5'3" to 5'6") | S | 15 to 16 in |
| 169 to 178 cm (5'7" to 5'10") | M | 17 to 18 in |
| 179 to 185 cm (5'10" to 6'1") | L | 19 to 20 in |
| 186 to 193 cm (6'1" to 6'4") | XL | 21 to 22 in |
| 194 cm and up (6'4"+) | XXL | 23 in + |
Hybrid bike sizes
| Size | Rider height | Inseam |
|---|---|---|
| S | 155 to 165 cm (5'1" to 5'5") | 28 to 31 in |
| M | 165 to 175 cm (5'5" to 5'9") | 30 to 33 in |
| L | 175 to 186 cm (5'9" to 6'1") | 32 to 35 in |
| XL | 186 to 197 cm (6'1" to 6'6") | 34 to 37 in |
| 2XL | 197 to 203 cm (6'6" to 6'8") | 36 to 37 in |
Kids bike size by height and age
| Wheel | Child height | Inseam | Typical age |
|---|---|---|---|
| 12 in | 2'10" - 3'4" | 14 to 17 in | 2 to 3 |
| 14 in | 3'1" - 3'7" | 16 to 20 in | 3 to 4 |
| 16 in | 3'7" - 4'0" | 18 to 22 in | 4 to 6 |
| 20 in | 4'0" - 4'5" | 22 to 25 in | 5 to 8 |
| 24 in | 4'5" - 4'9" | 24 to 28 in | 7 to 11 |
| 26 in | 4'9" + | 28 in + | 10 + |
Frame sizes are measured differently by different makers (seat tube length, or S to XL labels), and geometry varies. Use these charts to narrow it down, then check the maker's own chart for the exact model.
Related tools
Buying for your bike? Bike tire size chart.
Questions
What size bike do I need for my height?
On BikeRadar's chart a rider of 5 ft 7 in to 5 ft 10 in (170 to 178 cm) fits a 54 cm road frame or an 18 in mountain bike frame. Enter your height above for your range.
What size bike for a 5 foot 4 woman?
About 163 cm: BikeRadar puts 163 to 170 cm on a 51 cm road frame and a 16 in mountain bike frame. Women-specific models use the same height ranges.
What size bike for a 7 year old?
REI's chart lists 20 in wheels for ages 5 to 8 and 24 in wheels for ages 7 to 11, so measure height and inseam to decide.
Sources
- BikeRadar: Bike size guide: how to find the right size bike for you (checked 2026-10-02)
- evo: Mountain Bike Size Chart, Fit & Frame Geometry (checked 2026-10-02)
- Trek Bicycle: FX 2 (sizing table) (checked 2026-10-02)
- REI: The Ultimate Guide to Buying a Kids' Bike (checked 2026-10-02)
Last checked: 5 October 2026