How to Choose Your Bike Size [ The Simplest Way ]
Buying a bike should be exciting. Trying to figure out whether you need a small, medium, large, 54 cm, or 58 cm frame? Not quite as fun.
And it gets even more confusing when you throw different bike types into the mix.
A road bike fits differently from a mountain bike, so the right size can change depending on what and where you ride.
The good news is that finding your bike size is actually pretty simple. Our bike size charts below will help you quickly narrow down the right frame size, whether you’re buying your first bike, upgrading your current ride, or just trying to avoid the classic “this bike feels way too big” mistake.
First, you’ll need to measure your height. Stand straight against a wall, mark the point level with the top of your head, then measure from the floor to the mark. No special tools, no complicated formulas.
Got your height?
Great. Now let’s find the right bike size for each type of bike.
Road Bike Size Chart
Road bikes come with different frame shapes – compact, semi-compact, and traditional. After the shape, you have to find your size.
| Riders’ Height | Size ( Inches ) | Size |
| 4’10’’ – 5’2’’ | 47cm – 48cm | XX-Small |
| 5’2’’ – 5’6’’ | 49cm – 50cm | X-Small |
| 5’3’’ – 5’6’’ | 54cm – 53cm | Small |
| 5’6’’ – 5’9’’ | 54cm – 55cm | Medium |
| 5’9’’ – 6’0’’ | 56cm – 58cm | Large |
| 6’0’’ – 6’3’’ | 58cm – 60cm | X-Large |
| 6’3’’ – 6’6’’ | 61cm – 63cm | XX-Large |
Mountain Bike Size Chart
The easiest way to find your mountain bike size is to measure your height. Many riders find themselves between sizes. Choosing to go up or down is a personal preference. Keep in mind that bigger bikes have a longer wheelbase which means more stability on high-speed descents.
| Height | Size ( Inches ) | Size |
| 4’10’’ – 5’2’’ | 13’’ – 14’’ | X-Small |
| 5’2’’ – 5’6’’ | 15’’ – 16’’ | Small |
| 5’6’’ – 5’10’’ | 17’’ – 18’’ | Medium |
| 5’10’’ – 6’1’’ | 19’’ – 20’’ | Large |
| 6’1’’ – 6’4’’ | 21’’ – 22’’ | X-Large |
| 6’4’’ – 6’6’’ | 22’’ – 24’’ | XX-Large |
Hybrid Bike Size Chart
| Height | Size ( Inches ) | Size |
| 4’10 – 5’2’’ | 13’’ – 14’’ | X-Small |
| 5’2’’ – 5’6’’ | 15’’ – 16’’ | Small |
| 5’6’’ – 5’10’’ | 17’’ – 18’’ | Medium |
| 5’10’’ – 6’1’’ | 19’’ – 20’’ | Large |
| 6’1’’ – 6’4’’ | 21’’ – 22’’ | X-Large |
| 6’4’’ – 6’6’’ | 23’’ – 24’’ | XX-Large |
Kid’s Bike Size Chart
| Height | Age Range | Suggested Wheel Size |
| Up to 3’’ | Under 2 years | Balance Bikes |
| 3’ – 3’5’’ | 2 – 4 years | 12’’ |
| 3’5’’ – 3’9’’ | 4 – 7 years | 14 – 16’’ |
| 3’9’’ – 4’5’’ | 7 – 10 years | 18 – 20’’ |
| 4’5’’ – 5’ | 10 – 13 years | 24’’ |
| 5’+ | 13 years + | 26 – 27.5’’ |
BMX Bike Size Chart
| Height | Age | Size ( Inches ) |
| 3’7’’ – 4’0’’ | 5 – 7 years | 16’’ |
| 4’0’’ – 4’10’’ | 7 – 11 years | 18’’ |
| 4’10’’ – 6’4’’ | 11+ years | 20’’ |
Please note that frame sizes from XXS to XXL don’t have the same meaning for every bike brand. Sometimes you will need some additional measurements like the inseam.
Read more:
The height ranges are a useful first cut, but frame choice also depends on inseam, reach, stack, and exact top-tube height. Two bikes with the same nominal size can feel very different once wheel diameter, tire volume, crank length, stem, and saddle position change. For kids especially, standover clearance and brake reach matter more than age alone. When checking fit, I find it helpful to put actual height, width, and diameter on the same scale; it makes standover, storage, and transport clearance much easier to judge.