Bike size chart

Bike Size Chart: Find Your Frame Size

Compare road, gravel, hybrid, and kids bike sizes by height and inseam. Use the calculator for a personalized recommendation across Trek, Giant, and Specialized.

Need the step-by-step process? How to choose a bike size covers bike type, height, inseam, standover, and reach before you compare a chart.

All bike types

Road, gravel, hybrid, and kids charts in one place.

Cm & inches

Every chart shows both metric and imperial measurements.

Interactive

Use the calculator to narrow to one or two likely sizes.

Find your bike size

Enter height and inseam to get a personalized size across brands.

Detailed check

Measurement system

Height

Inseam(in)optional

Bike type

Brand

Model

Model details help you compare frames; your size comes from the available chart ranges.

Riding position

Enter your measurements to see a recommended size, an alternative, and why it fits.

Height and inseam for these charts

Use height and cycling inseam with the tables below. For the full process, including standover, reach, and brand charts, see how to choose a bike size.

How to measure your height

Stand barefoot against a wall, heels touching. Place a book on your head, flat against the wall. Mark the wall at the bottom of the book. Measure from floor to mark in cm or inches.

How to measure your inseam

Stand barefoot with feet 6-8 inches apart. Place a book between your legs, spine up, pressed firmly against your crotch (simulating saddle pressure). Measure from the top of the book to the floor. This is your cycling inseam — not your pants inseam.

Standover clearance check

Your inseam should be at least 2-3cm (about 1 inch) greater than the bike's standover height for road bikes, and 5-7cm (2-3 inches) for mountain bikes. This ensures you can stand over the top tube with both feet flat.

Bike size charts by type

Each chart maps rider height and inseam to the recommended frame size. Use these as a starting range, then confirm with the calculator or a test ride.

Road bike size chart

Road bike frame sizes in cm. Use height and inseam to find your range. Also applies to most gravel, cyclocross, and time trial bikes.

Height

Height cm

Inseam

Frame Size

Notes

4'10"–5'0"

148–152

27"–28"

XXS (47–48cm)

Entry-level road size; check smallest models.

5'0"–5'3"

152–160

28"–30"

XS (49–50cm)

Common for shorter riders.

5'3"–5'6"

160–168

30"–31"

S (51–53cm)

Compact road size.

5'6"–5'9"

168–175

31"–32"

M (54–55cm)

Gravel bike size chart

Gravel bikes use similar frame sizing to road bikes but with slightly more upright geometry. Most gravel riders can use the road chart; pick the larger size if between.

Height

Height cm

Inseam

Frame Size

Notes

4'10"–5'2"

148–158

27"–29"

XS (47–49cm)

Gravel XS ≈ road XS; slightly more upright.

5'2"–5'6"

158–168

29"–31"

S (50–52cm)

5'6"–5'9"

168–175

31"–32"

M (53–55cm)

Most common gravel size.

5'9"–6'1"

175–185

32"–34"

L (56–58cm)

6'1"–6'4"

185–193

34"–36"

XL (58–61cm)

Height4'10"–5'2"

Height cm148–158

Inseam27"–29"

Frame SizeXS (47–49cm)

NotesGravel XS ≈ road XS; slightly more upright.

Height5'2"–5'6"

Height cm158–168

Inseam29"–31"

Frame SizeS (50–52cm)

Notes

Height5'6"–5'9"

Height cm168–175

Inseam31"–32"

Frame SizeM (53–55cm)

NotesMost common gravel size.

Height5'9"–6'1"

Height cm175–185

Inseam32"–34"

Frame SizeL (56–58cm)

Notes

Height6'1"–6'4"

Height cm185–193

Inseam34"–36"

Frame SizeXL (58–61cm)

Notes

Hybrid & commuter bike size chart

Hybrid, city, and commuter bike sizes in inches and alpha labels. These bikes prioritize upright comfort and standover clearance.

Height

Height cm

Inseam

Frame Size

Notes

4'10"–5'2"

148–158

27"–29"

XS (13–14")

City/commuter entry size.

5'2"–5'6"

158–168

29"–31"

S (15–16")

Commuter sweet spot.

5'6"–5'10"

168–178

32"–34"

M (17–18")

Most common hybrid size.

5'10"–6'1"

178–185

33"–35"

L (19–20")

6'1"–6'4"

185–193

34"–36"

XL (21–22")

6'4"–6'6"

193–198

35"–36"

XXL (23–24")

Height4'10"–5'2"

Height cm148–158

Inseam27"–29"

Frame SizeXS (13–14")

NotesCity/commuter entry size.

Height5'2"–5'6"

Height cm158–168

Inseam29"–31"

Frame SizeS (15–16")

NotesCommuter sweet spot.

Height5'6"–5'10"

Height cm168–178

Inseam32"–34"

Frame SizeM (17–18")

NotesMost common hybrid size.

Height5'10"–6'1"

Height cm178–185

Inseam33"–35"

Frame SizeL (19–20")

Notes

Height6'1"–6'4"

Height cm185–193

Inseam34"–36"

Frame SizeXL (21–22")

Notes

Height6'4"–6'6"

Height cm193–198

Inseam35"–36"

Frame SizeXXL (23–24")

Notes

Bike wheel size chart

Kids bikes are sized by wheel diameter, not frame size. Adult bike wheel sizes (26", 27.5", 29", 700c) affect fit and handling.

Wheel

Age

Height

Height cm

Inseam

Notes

12"

2–3 yrs

2'4"–3'1"

71–94

15"–18"

Balance / first pedal

14"

2–4 yrs

2'8"–3'7"

81–109

15"–20"

First pedal bike

16"

4–6 yrs

3'2"–4'0"

97–122

16"–22"

Training wheels optional

18"

5–7 yrs

3'6"–4'3"

107–130

18"–23"

Transition to bigger wheels

20"

6–9 yrs

3'9"–4'6"

114–137

19"–25"

BMX / kids MTB

24"

8–12 yrs

4'2"–5'0"

127–152

23"–28"

Youth MTB / junior road

26"

11+ yrs

4'8"–5'6"

142–168

25"–30"

Adult transition / cruiser

27.5"

Teen/Adult

5'2"–6'0"

158–183

28"–33"

MTB mid-size

29"

Teen/Adult

5'4"–6'4"

163–193

30"–35"

MTB large / 700c equivalent

700c

Teen/Adult

5'2"–6'6"

158–198

28"–36"

Road / gravel / hybrid

Wheel12"

Age2–3 yrs

Height2'4"–3'1"

Height cm71–94

Inseam15"–18"

NotesBalance / first pedal

Wheel14"

Age2–4 yrs

Height2'8"–3'7"

Height cm81–109

Inseam15"–20"

NotesFirst pedal bike

Wheel16"

Age4–6 yrs

Height3'2"–4'0"

Height cm97–122

Inseam16"–22"

NotesTraining wheels optional

Wheel18"

Age5–7 yrs

Height3'6"–4'3"

Height cm107–130

Inseam18"–23"

NotesTransition to bigger wheels

Wheel20"

Age6–9 yrs

Height3'9"–4'6"

Height cm114–137

Inseam19"–25"

NotesBMX / kids MTB

Wheel24"

Age8–12 yrs

Height4'2"–5'0"

Height cm127–152

Inseam23"–28"

NotesYouth MTB / junior road

Wheel26"

Age11+ yrs

Height4'8"–5'6"

Height cm142–168

Inseam25"–30"

NotesAdult transition / cruiser

Wheel27.5"

AgeTeen/Adult

Height5'2"–6'0"

Height cm158–183

Inseam28"–33"

NotesMTB mid-size

Wheel29"

AgeTeen/Adult

Height5'4"–6'4"

Height cm163–193

Inseam30"–35"

NotesMTB large / 700c equivalent

Wheel700c

AgeTeen/Adult

Height5'2"–6'6"

Height cm158–198

Inseam28"–36"

NotesRoad / gravel / hybrid

Sizing tips

Charts give you a range. These tips narrow it down.

Between two sizes?

Go smaller for a sportier, more aggressive position. Go larger for a more upright, comfort-oriented ride. Your inseam and flexibility should drive the final decision.

Don't match by label alone

A 'Medium' in Trek is not the same as a 'Medium' in Giant or Specialized. Always match by the brand's published height range, not the size label.

Inseam beats height

Two riders of the same height can need different frame sizes if their inseams differ by more than 2 inches. Standover clearance is non-negotiable for safety.

Use the calculator for precision

The charts on this page give you a range. The calculator narrows it to one or two sizes by cross-referencing your height, inseam, bike type, and brand.

Want the full process instead of a lookup table? How to choose a bike size is the step-by-step guide; this page stays a chart.

Brand sizing comparison

At the same rider height, Trek, Giant, and Specialized labels differ. Match by height range, not by size label.

Height

Trek

Giant

Specialized

5'0"–5'3"

XS / 47

5'3"–5'6"

S / 50

5'6"–5'9"

M / 54

5'9"–6'1"

ML / 56

M/L

6'1"–6'3"

L / 58

6'3"–6'6"

XL / 61

Height5'0"–5'3"

TrekXS / 47

GiantXS

Specialized49

Height5'3"–5'6"

TrekS / 50

GiantS

Specialized52

Height5'6"–5'9"

TrekM / 54

GiantM

Specialized54

Height5'9"–6'1"

TrekML / 56

GiantM/L

Specialized56

Height6'1"–6'3"

TrekL / 58

GiantL

Specialized58

Height6'3"–6'6"

TrekXL / 61

GiantXL

Specialized61

Go deeper with brand-specific charts

Each brand page includes brand-specific sizing notes, model-level data, and the interactive calculator pre-set for that brand.

Trek size chart Giant size chart Specialized size chart Bike frame size chart Mountain bike chart Kids bike chart Bike size chart by age Kids bike size chart by height Bike size chart by height in inches

Bike sizing FAQ

Short answers for the most common bike sizing questions.

How do I use this bike size chart?

Pick the table for your bike type, match your height to a size range, then confirm with inseam. This page is a lookup chart. For the step-by-step process of how to choose a bike size, use the sizing guide.

What road bike size is 5'6" to 6'0" on this chart?

On the road chart above, 5'6"–5'9" maps to 54–55cm (M) and 5'9"–6'0" maps to 56–58cm (L). Confirm with inseam, then check the exact brand chart before buying.

Are bike sizes the same across brands?

No. Trek M (54cm) ≈ Giant M ≈ Specialized 54cm by height range, but the actual frame geometry differs. Trek offers an ML half-size that Giant and Specialized don't. Always match by the brand's published height range.

Should I use cm or inches for bike sizing?

Road bikes are typically sized in cm (frame size). Mountain and hybrid bikes are often sized in inches or alpha sizes (S/M/L). Kids bikes are sized by wheel diameter. Use the chart above for cross-reference.

What if my height and inseam suggest different sizes?

Trust your inseam for standover safety first. If your inseam is short for your height, go with the smaller frame. If your inseam is long, you have more flexibility — prioritize reach and stack for your riding style.