Giant Bike Size Chart in CM: Road & Mountain
Match Giant S, M, M/L, L, and XL sizing to rider height, inseam, and frame labels in centimeters.
Giant system
Alpha sizes S/M/M/L/L/XL with M/L half-step for riders between sizes.
CM sizing
Giant uses compact geometry. Match by height range, not by top-tube length.
Cross-brand
Giant M ≈ Trek 54. Confirm with published height ranges, not labels.
Model geometry is a reference check; sizing comes from the available size chart rows.
Enter your measurements to see your recommended size, backup size, confidence, and why it fits.
Giant sizing system
Giant uses compact geometry with M/L as a half-step between sizes.
Giant uses S, M, M/L, L, XL labels for road and gravel bikes. M/L is a half-step between M and L for riders who fall between those ranges.
Giant road bikes use compact geometry with sloping top tubes. Stack and reach values differ from traditional horizontal-top-tube frames.
Giant mountain bikes use S, M, L, XL. Wheel size varies by frame size — smaller frames may ship with 27.5" wheels while larger frames use 29".
Giant size chart by bike type
Road and mountain sizing from Giant's brand-level sizing guide. For gravel models like Revolt, check the model-specific page.
Giant road size chart
Size
XS
Height
5'1"–5'5"
Height cm
155–165
Inseam cm
70–75
Standover cm
–
Fit note
Entry size for shorter riders; confirm model availability.
Size
S
Height
5'4"–5'8"
Height cm
163–173
Inseam cm
74–79
Standover cm
–
Fit note
Compact road size for riders around 5'5"–5'7".
Size
M
Height
5'7"–5'11"
Height cm
171–180
Inseam cm
78–83
Standover cm
–
Fit note
Most common road size for average-height riders.
Size
M/L
Height
5'10"–6'1"
Height cm
178–186
Inseam cm
82–87
Standover cm
–
Fit note
Giant's half-step for riders between M and L.
Size
L
Height
6'0"–6'4"
Height cm
184–192
Inseam cm
86–91
Standover cm
–
Fit note
For riders over 6 ft; confirm reach is comfortable.
Size
XL
Height
6'3"–6'7"
Height cm
190–200
Inseam cm
90–96
Standover cm
–
Fit note
Tall riders; check standover and reach on the model page.
Giant mountain size chart
Size
XS
Height
4'11"–5'3"
Height cm
150–160
Inseam cm
66–72
Standover cm
–
Fit note
Smaller frames may ship with 27.5" wheels.
Size
S
Height
5'2"–5'7"
Height cm
158–170
Inseam cm
70–77
Standover cm
–
Fit note
Size
M
Height
5'6"–5'10"
Height cm
168–178
Inseam cm
76–82
Standover cm
–
Fit note
Most frames at M and above ship with 29" wheels.
Size
L
Height
5'9"–6'2"
Height cm
176–188
Inseam cm
81–87
Standover cm
–
Fit note
Size
XL
Height
6'1"–6'6"
Height cm
186–198
Inseam cm
86–93
Standover cm
–
Fit note
Giant vs Trek vs Specialized at the same height
Height
5'4"–5'8"
Trek
S / 52
Giant
S
Specialized
49 / S
Height
5'7"–5'11"
Trek
M / 54
Giant
M
Specialized
52 / M
Height
5'10"–6'1"
Trek
ML / 56
Giant
M/L
Specialized
54 / M
Height
6'0"–6'4"
Trek
L / 58
Giant
L
Specialized
56 / L
Height
6'3"–6'7"
Trek
XL / 61
Giant
XL
Specialized
58 / XL
Popular Giant models
Between Giant sizes
Use Giant's M/L half-size, then confirm with standover.
Pick the smaller Giant size
When your inseam is on the short side of the range, or you want a lower, more aggressive position on TCR or Propel.
Pick the larger Giant size
When standover clears easily and you prefer a more upright position. Confirm reach is not too long.
Use M/L if available
Giant's M/L half-size is ideal for 5'10"–6'0" riders who fall squarely between M and L. It's one of Giant's most popular sizes.
Giant bike FAQ
Short answers for choosing a Giant frame before purchase.
What size Giant bike should I get?
Start with Giant's published height range: S fits approximately 5'4"–5'8", M fits 5'7"–5'11", M/L fits 5'10"–6'1", L fits 6'0"–6'4", XL fits 6'3"–6'7". Confirm with inseam and model-specific geometry.
Is Giant M/L right for me?
Giant's M/L is a half-size between M and L. If you are 5'10"–6'0" and between sizes, M/L often gives the best fit without going too long on reach or too tall on standover.
Are Giant bike sizes in cm or inches?
Giant uses alpha labels (S, M, M/L, L, XL) for most bikes. The frame geometry is published in millimeters, but the sizing label is the primary fit reference. Some legacy or city models may use cm labels.
How does Giant sizing compare to Trek?
At the same rider height, Giant M roughly corresponds to Trek 54/M, but Giant's M/L has no direct Trek equivalent. Always match by published height range, not by label.
Data sources