Step 01
Measure Your Total Height
Stand barefoot with your back against a flat wall and measure from the floor to the crown of your head in centimeters or inches.
Universal Sizing Guide
Frame geometry & sizing
Bike Frame Size Chart
This bike frame size chart translates your height and inseam into centimeter, inch, and letter-size labels for road, mountain, and gravel bikes. Because a frame size is a label rather than a universal body measurement, different riding disciplines use distinct numbering formats. Use height first to establish your baseline size, then confirm inseam and standover clearance for the exact model you plan to ride.
Last reviewed: 2026-08-26
Find your size
Use your measurements to narrow your options to one or two likely sizes.
ft
in
Model details help you compare frames; your size comes from the available chart ranges.
Enter your measurements to see a recommended size, an alternative, confidence, and why it fits.
The sizing process
Five steps to find the right bike fit
Use the steps below to narrow your options, then confirm the result with the bike's frame details and size chart.
Step 02
Measure Your Cycling Inseam
Place a book firmly between your legs against your pelvic bone and measure the distance from the top of the book spine straight down to the floor.
Step 03
Identify the Label System for Your Bike Type
Check whether your intended bike uses centimeters (common for road bikes), inches, or letter sizes (common for mountain bikes).
Step 04
Check Standover Clearance
Compare your inseam to the bicycle frame size chart standover height to ensure safe clearance when straddling the top tube.
Step 05
Confirm with a Calculator or Brand Chart
Use a bike frame size calculator or manufacturer geometry table to verify reach, stack, and cockpit fit for your specific model.
Related guides
Choose the right size chart
Next, compare measurements, bike types, and specific models using the guides below.
Bike frame size calculator
Input your height and inseam measurements to calculate recommended frame sizes across multiple bike categories.
Complete bike size chart
Explore comprehensive sizing tables covering road, mountain, gravel, hybrid, and commuter bicycles.
Road bike size chart
View detailed centimeter-based road sizing guidance with standover and reach considerations.
Mountain bike size chart
Find the ideal mountain bike frame size in inches and S-M-L labels for trail and XC riding.
How to choose a bike size
A comprehensive guide on measuring your body, evaluating frame geometry, and testing for proper fit.
Gravel bike size chart
Review gravel and all-road frame sizing charts built for endurance comfort and mixed-surface control.
Understanding Frame Dimensions
How to Choose the Right Bike Frame Size
Frame Size Is a Sizing Label, Not a Body Measurement
A frame size is a label, not a body measurement. Road bikes are traditionally measured in centimeters based on seat tube length, mountain bikes in inches or letter sizes (S, M, L), and hybrid bikes frequently use either system. Knowing your bike frame size by height gives you a reliable starting range, but individual brand geometries vary.
How to Measure Bike Frame Size and Standover
Understanding how to measure bike frame size begins with checking the seat tube length from the center of the bottom bracket to the seat tube collar. In addition to frame size, measure your cycling inseam to verify standover clearance over the top tube. Road and gravel bikes generally require 1 to 2 inches of clearance, while mountain bikes require 2 to 4 inches for off-road control.
Road, Mountain, and Hybrid Labels Are Not Interchangeable
A 54 cm road bike frame size chart recommendation does not translate directly to a 54 cm hybrid or gravel frame. Road bikes feature longer top tubes designed for an aerodynamic posture, whereas mountain bike frame size chart recommendations prioritize lower top tubes and upright control. Always evaluate sizing within the specific bike category rather than transferring a single number across styles.
What to Do When You Fall Between Two Sizes
If your height and inseam place you between two sizes, your upper body proportions and brand geometry serve as the tie-breaker. Riders with longer torsos or arms generally fit better on the larger frame for adequate reach, while riders with shorter reach benefit from the agility of the smaller frame. Use height first, then confirm inseam and the exact model before deciding.
Universal Frame Sizing and Label Reference
Starting centimeter, inch, and letter-size labels by rider height. Confirm the range with the road, mountain, or gravel chart and the exact model.
Size
Height
Inseam
XS / 47-49 cm / 13-14 in
5'0"-5'5"
26-28 in inseam
S / 50-52 cm / 15-16 in
5'5"-5'8"
28-30 in inseam
M / 54-56 cm / 17-18 in
5'8"-5'11"
30-32 in inseam
L / 56-58 cm / 19-20 in
5'11"-6'2"
32-34 in inseam
XL / 60-62 cm / 21-22 in
6'2"-6'5"
34-36 in inseam
Size
XS / 47-49 cm / 13-14 in
Height
5'0"-5'5"
Inseam: 26-28 in inseam
Size
S / 50-52 cm / 15-16 in
Height
5'5"-5'8"
Inseam: 28-30 in inseam
Size
M / 54-56 cm / 17-18 in
Height
5'8"-5'11"
Inseam: 30-32 in inseam
Size
L / 56-58 cm / 19-20 in
Height
5'11"-6'2"
Inseam: 32-34 in inseam
Size
XL / 60-62 cm / 21-22 in
Height
6'2"-6'5"
Inseam: 34-36 in inseam
Road Bike Frame Size Chart by Rider Height
Centimeter-based frame size recommendations paired with rider height and cycling inseam ranges for road cycling.
Size
Height
Inseam
48
155-163 cm
69-74 cm
50
161-167 cm
73-77 cm
52
164-171 cm
74-79 cm
54
169-177 cm
77-82 cm
56
176-184 cm
81-86 cm
58
181-190 cm
85-90 cm
61
188-198 cm
89-95 cm
Size
48
Height
155-163 cm
Inseam: 69-74 cm
Size
50
Height
161-167 cm
Inseam: 73-77 cm
Size
52
Height
164-171 cm
Inseam: 74-79 cm
Size
54
Height
169-177 cm
Inseam: 77-82 cm
Size
56
Height
176-184 cm
Inseam: 81-86 cm
Size
58
Height
181-190 cm
Inseam: 85-90 cm
Size
61
Height
188-198 cm
Inseam: 89-95 cm
Mountain Bike Frame Size Chart by Rider Height
Letter-size frame recommendations optimized for off-road standover clearance, stability, and trail control.
Size
Height
Inseam
XS
150-160 cm
67-72 cm
S
158-169 cm
71-77 cm
M
167-178 cm
76-82 cm
L
176-188 cm
81-87 cm
XL
186-198 cm
86-93 cm
XXL
193-204 cm
91-98 cm
Size
XS
Height
150-160 cm
Inseam: 67-72 cm
Size
S
Height
158-169 cm
Inseam: 71-77 cm
Size
M
Height
167-178 cm
Inseam: 76-82 cm
Size
L
Height
176-188 cm
Inseam: 81-87 cm
Size
XL
Height
186-198 cm
Inseam: 86-93 cm
Size
XXL
Height
193-204 cm
Inseam: 91-98 cm
Gravel Bike Frame Size Chart by Rider Height
Gravel and all-road frame labels by rider height and inseam. Confirm standover and reach before copying a road size.
Size
Height
Inseam
XS
155-164 cm
70-75 cm
S
162-172 cm
74-79 cm
M
170-179 cm
78-83 cm
L
178-189 cm
83-89 cm
XL
186-197 cm
87-94 cm
Size
XS
Height
155-164 cm
Inseam: 70-75 cm
Size
S
Height
162-172 cm
Inseam: 74-79 cm
Size
M
Height
170-179 cm
Inseam: 78-83 cm
Size
L
Height
178-189 cm
Inseam: 83-89 cm
Size
XL
Height
186-197 cm
Inseam: 87-94 cm
FAQ
Quick answers to common bike-sizing questions.
How do I use a bike frame size chart?
Find your total height on the chart to identify your baseline size range in centimeters, inches, or letter sizes. Then cross-reference your cycling inseam to ensure proper standover clearance on the specific bicycle frame size chart for your bike type.
What is a bicycle frame size chart?
A bicycle frame size chart is a standardized reference table that matches rider height and inseam measurements to manufacturer frame sizes. It helps cyclists identify the right frame dimensions for comfort, pedaling efficiency, and safe handling.
Is a frame size chart by height enough?
A frame size chart by height provides an accurate initial estimate, but height alone does not reflect torso length or leg proportion. Confirming your inseam and reviewing manufacturer geometry ensures the bike fits your reach and standover requirements.
How do I measure bike frame size?
To measure bike frame size, measure from the center of the bottom bracket axle to the top of the seat tube where the seat collar sits. Because modern frames often have sloping top tubes, manufacturer geometry tables and standover height are more dependable than seat tube length alone.
Should I use centimeters, inches, or S/M/L?
Road bikes typically use centimeters, mountain bikes most often use inches or S/M/L letters, and hybrid bikes use either format depending on the brand. Always refer to the sizing convention specified by the bicycle manufacturer.
What size bike frame do I need for my height?
Your bike frame size by height depends on the riding category; for example, a rider at 5'10" (178 cm) typically rides a 54–56 cm road frame or a medium/large (17–19") mountain bike. Use height first, then confirm inseam and the exact model.