Adult frame sizing
Bike Size Chart by Height in Inches
Use this bike size chart by height in inches when a shop or brand lists rider height in feet and inches. The table maps adult mountain frame size inches to rider height; road and gravel bikes often use centimeter frame labels instead.
Last reviewed: 2026-08-31
Adult Mountain Bike Size Chart by Height in Inches
Frame size
XS · 13-14 in
Rider height
4'10"-5'2" / 148-158 cm
Inseam / fit check: 26-28 in inseam
Frame size
S · 15-16 in
Rider height
5'2"-5'6" / 158-168 cm
Inseam / fit check: 28-30 in inseam
Frame size
M · 17-18 in
Rider height
5'6"-5'10" / 168-178 cm
Inseam / fit check: 30-32 in inseam
Frame size
L · 19-20 in
Rider height
5'10"-6'1" / 178-185 cm
Inseam / fit check: 32-34 in inseam
Frame size
XL · 21-22 in
Rider height
6'1"-6'4" / 185-193 cm
Inseam / fit check: 34-36 in inseam
Frame size
XXL · 23-24 in
Rider height
6'4"-6'6" / 193-198 cm
Inseam / fit check: 36+ in inseam; confirm reach
Sizing notes
Read the chart, then check the bike.
Feet and inches describe rider height
In this bike size chart by height in inches, values such as 5'6"-5'10" describe the rider's height. They are not the frame measurement.
Frame inches are not wheel inches
A bicycle frame size inches label such as 17 or 19 usually describes an adult mountain or hybrid frame. On kids and BMX bikes, 16, 20, or 24 inches usually describes wheel diameter.
Road bikes usually use centimeters
Road and gravel frames commonly use centimeter labels such as 52, 54, or 56 even when the rider measures height in feet and inches. Use the road bike size chart for that label system.
Inseam decides close calls
Height gives a starting frame range. Check inseam, standover, reach, and stack on the exact model before choosing between adjacent sizes.
Related guides
Choose the right chart for your bike
Once you have a starting size, compare the chart for your bike type or exact model.
Road bike size chart
Use centimeter frame labels when the bike is a road or gravel model.
FAQ
Quick answers to common bike-sizing questions.
How do I use a bike size chart by height in inches?
Match your feet-and-inches height to the rider range, then check inseam, standover, reach, bike type, and the exact brand chart.
What does bicycle frame size inches mean?
Bicycle frame size inches usually means an adult frame label, especially on mountain and hybrid bikes. It is different from wheel diameter.
What mountain bike size inches do I need?
Use the rider-height range as a starting point, then confirm inseam, standover, reach, and the model's geometry. A 17- or 18-inch label often maps to a medium range, but brands differ.
Are bike inches frame size or wheel size?
Both are possible. Adult mountain and hybrid inch labels often describe frame size; kids, BMX, and folding-bike inch labels often describe wheel diameter.