Caleb MorganBy Caleb Morgan

Updated November 2026

A bike frame size chart in centimeters matches your body height to a frame size, giving you a starting point before you ever sit on a bike. This guide shows you how to read a bike frame size chart centimeters, measure your inseam, and check the fit so you can narrow your choices with confidence. Charts are a starting point, not the final word, so you will also learn how to confirm the fit on a real bike.

Why Centimeters Matter When You Compare Frame Sizes

Brands use different sizing systems. Some label frames S, M, L, while others use numbers in centimeters, and a few still list sizes in inches. Frame size in centimeters usually refers to the length of the seat tube, measured from the center of the bottom bracket to the top of the seat tube, though some brands measure to the center of the top tube instead. Because of this, always check the chart from the specific brand you are buying, and do not assume a 54 cm from one company matches a 54 cm from another.

Shopping for one? See our guide: Trail Bike Size Chart: 3 Best Picks for Finding Your Frame Fit.

Step-by-Step: Using a Bike Frame Size Chart in Centimeters

Step 1: Measure your height

Stand barefoot against a wall with your heels about 15 cm (6 inches) apart. Mark the top of your head on the wall, then measure from the floor to the mark. Write the number down in centimeters.

Step 2: Measure your inseam

Stand against the wall with a hardcover book between your legs, spine pressed up firmly. Measure from the top of the book to the floor. This number, in centimeters, is more useful for bike fit than height alone, because bikes depend on leg length.

Step 3: Read the chart for your height range

Find your height on the brand’s chart and note the frame size it suggests. Many charts list a height range for each size, such as 165 to 172 cm. If your height falls between two sizes, check your inseam and reach measurements to decide.

Step 4: Compare with the stack and reach numbers

Road and gravel brands often list stack (the vertical distance from the bottom bracket to the head tube) and reach (the horizontal distance). A taller stack suits a more upright position, while a longer reach suits a stretched-out one. Pick the size that fits your flexibility and riding goals.

Step 5: Check the sample chart

The table below shows a general example. Always defer to the manufacturer’s own chart.

Rider height (cm) Typical frame size (cm)
150 to 160 44 to 48
160 to 168 48 to 52
168 to 175 52 to 56
175 to 183 56 to 60
183 and up 60 and up

Step 6: Confirm the fit on the bike

Once you have a candidate size, sit on the bike and check standover clearance (you should have roughly 2 to 5 cm between you and the top tube for a road bike, more for a mountain bike). On a road bike, your hands should rest comfortably on the hoods with a slight bend in the elbows. If possible, test ride before buying. For more on how these charts vary by category, see Trek Road Bike Frame Size Chart: How to Pick Your Right Size and Women's Hybrid Bike Size Chart: How to Find Your Right Frame Size.

Checklist Before You Buy

  • Height in centimeters, measured barefoot
  • Inseam in centimeters, measured with a book
  • The brand’s own size chart, not a generic one
  • Standover clearance on the actual bike
  • Reach and stack if you plan to ride long distances

Common Mistakes to Avoid

  • Assuming the same centimeter number means the same size across brands.
  • Choosing by height alone and ignoring inseam, which often changes the best fit.
  • Buying a frame that is too large because it seems to “grow with you.” Oversized frames handle poorly and can be hard to control.
  • Ignoring the saddle and handlebar adjustments that fine-tune the fit once you have the right frame.

A simple tape measure or a rigid measuring stick makes it easy to record your height and inseam accurately. Many riders also find a basic bike fit tool helpful for checking saddle height after purchase. Search for these options here: View on Amazon and View on Amazon.

FAQ

Is a bike frame size chart in centimeters accurate?

It gives a reliable starting point, but it cannot account for your proportions or riding style. Use it to narrow your options, then confirm with a test ride or a professional fitting.

Should I use height or inseam to choose a frame size?

Use both if you can. Inseam often matters more for standover and saddle height, while height helps you estimate reach and stack.

What if I am between two frame sizes?

Consider the riding position you want. A smaller frame with a longer stem feels more agile, while a larger frame feels more stable and stretched out. If you are unsure, a local bike shop can help you decide.

Conclusion

A bike frame size chart in centimeters works best when you measure your height and inseam carefully and compare them with the brand’s own chart. Confirm your choice by checking standover clearance and reach on the actual bike. If you feel unsure about a fit, consult a qualified bike fitter before buying.

Ready to choose one?

Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our cycling for beginners guides, checking product details against manufacturer specifications and owner feedback.