Giro
Register II MIPS
Everyday adult helmet with MIPS and a simple dial fit.
Universal Adult, 54–61 cm
View on AmazonPrice and availability on Amazon
Giant bike size chart
Giant Bike Size Chart in CM: Road, Mountain & Hybrid
Match Giant S, M, M/L, L, and XL sizing to rider height, then check the published standover of the frame you are buying.
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.
No rider inseam
Giant publishes height only, so standover decides between adjacent sizes.
Find your Giant size
Giant size chart by bike type
Each table below is one Giant family's own published sizing bar, with the standover of a named frame. Giant publishes no rider inseam, so every table carries height only.
Giant road size chart
Representative model: TCR Advanced 2. Source: Giant TCR Advanced 2 sizing bar and geometry table, reviewed 2026-10-06. TCR, Defy and Propel publish the same six height bands; the frame numbers differ per model. Standover is the TCR Advanced 2 frame.
Size
Height
Height cm
Standover cm
Fit note
XS
5'2"-5'7"
157-169
72.4
Shortest frame in the table; standover climbs 99 mm to XL
S
5'5"-5'9"
165-175
74.2
Standover clears at 742 mm
M
5'7"-5'11"
171-181
76.5
Most riders start here
M/L
5'10"-6'2"
177-187
78.7
Half-step above M, with 22 mm more standover
L
6'0"-6'4"
183-193
80.5
Reach is 402 mm, so confirm it before stepping up from M/L
XL
6'2"-6'6"
189-199
82.3
Tallest frame here, at 823 mm standover
Size
XS
Height
5'2"-5'7"
Height cm
157-169
Standover cm
72.4
Fit note
Shortest frame in the table; standover climbs 99 mm to XL
Size
S
Height
5'5"-5'9"
Height cm
165-175
Standover cm
74.2
Fit note
Standover clears at 742 mm
Size
M
Height
5'7"-5'11"
Height cm
171-181
Standover cm
76.5
Fit note
Most riders start here
Size
M/L
Height
5'10"-6'2"
Height cm
177-187
Standover cm
78.7
Fit note
Half-step above M, with 22 mm more standover
Size
L
Height
6'0"-6'4"
Height cm
183-193
Standover cm
80.5
Fit note
Reach is 402 mm, so confirm it before stepping up from M/L
Size
XL
Height
6'2"-6'6"
Height cm
189-199
Standover cm
82.3
Fit note
Tallest frame here, at 823 mm standover
Giant road frames change reach less than standover: TCR reach moves 40 mm from XS to XL while standover climbs 99 mm. Size by standover, then treat reach as the tiebreak.
Giant gravel size chart
Representative model: Revolt Advanced 2. Source: Giant Revolt Advanced 2 (2024) sizing bar and geometry table, reviewed 2026-10-06. Revolt publishes two positions per size under a flip-chip LOW | HIGH header; this table reads the LOW column throughout.
Size
Height
Height cm
Standover cm
Fit note
XS
5'1"-5'5"
155-166
72.4
Shortest frame in the table; standover climbs 83 mm to XL
S
5'3"-5'7"
159-171
74.0
Standover clears at 740 mm
M
5'7"-5'11"
169-181
75.7
Most riders start here
M/L
5'9"-6'1"
174-186
77.4
Half-step above M, with 17 mm more standover
L
5'10"-6'3"
179-191
79.1
Reach is 397 mm, so confirm it before stepping up from M/L
XL
6'2"-6'7"
189-200
80.7
Tallest frame here, at 807 mm standover
Size
XS
Height
5'1"-5'5"
Height cm
155-166
Standover cm
72.4
Fit note
Shortest frame in the table; standover climbs 83 mm to XL
Size
S
Height
5'3"-5'7"
Height cm
159-171
Standover cm
74.0
Fit note
Standover clears at 740 mm
Size
M
Height
5'7"-5'11"
Height cm
169-181
Standover cm
75.7
Fit note
Most riders start here
Size
M/L
Height
5'9"-6'1"
Height cm
174-186
Standover cm
77.4
Fit note
Half-step above M, with 17 mm more standover
Size
L
Height
5'10"-6'3"
Height cm
179-191
Standover cm
79.1
Fit note
Reach is 397 mm, so confirm it before stepping up from M/L
Size
XL
Height
6'2"-6'7"
Height cm
189-200
Standover cm
80.7
Fit note
Tallest frame here, at 807 mm standover
Revolt publishes its geometry twice per size under a LOW | HIGH header, and the two differ: the low position shortens the wheelbase and drops standover by 6 to 7 mm. The table above reads the low column on every row, so the sizes stay comparable with each other.
Giant mountain size chart
Representative model: Talon 4. Source: Giant Talon 4 (2025) sizing bar and geometry table, reviewed 2026-10-06. Talon 1 and Talon 2 publish the same bands and geometry. XS ships on 27.5" wheels; S and up use 29".
Size
Height
Height cm
Standover cm
Fit note
XS
5'1"-5'5"
155-166
68.4
Shortest frame in the table; standover climbs 26 mm to XL
S
5'4"-5'8"
163-172
71.5
Standover clears at 715 mm
M
5'7"-5'10"
169-179
70.9
Most riders start here
L
5'9"-6'1"
176-186
70.9
Reach is 456 mm, so confirm it before stepping up from M/L
XL
6'0"-6'4"
183-193
71.0
Tallest frame here, at 710 mm standover
Size
XS
Height
5'1"-5'5"
Height cm
155-166
Standover cm
68.4
Fit note
Shortest frame in the table; standover climbs 26 mm to XL
Size
S
Height
5'4"-5'8"
Height cm
163-172
Standover cm
71.5
Fit note
Standover clears at 715 mm
Size
M
Height
5'7"-5'10"
Height cm
169-179
Standover cm
70.9
Fit note
Most riders start here
Size
L
Height
5'9"-6'1"
Height cm
176-186
Standover cm
70.9
Fit note
Reach is 456 mm, so confirm it before stepping up from M/L
Size
XL
Height
6'0"-6'4"
Height cm
183-193
Standover cm
71.0
Fit note
Tallest frame here, at 710 mm standover
Talon standover is nearly flat across the range: 684 mm at XS and 710 mm at XL, a 26 mm spread. Reach and wheel size decide the size rather than clearance.
Giant hybrid size chart
Representative model: Escape 3. Source: Giant Escape 3 (2024) sizing bar and geometry table, reviewed 2026-10-06. Escape and Escape Disc publish these four bands and Cypress publishes them too; FastRoad AR adds an ML between M and L. The frame numbers differ per model, so standover is the Escape 3 frame.
Size
Height
Height cm
Standover cm
Fit note
S
5'3"-5'7"
160-170
71.4
Standover clears at 714 mm, the lowest frame here
M
5'7"-5'11"
170-180
75.4
Most riders start here
L
5'11"-6'3"
180-190
79.9
Reach is 416 mm, so confirm it before stepping up from M/L
XL
6'3"-6'7"
190-200
84.2
Tallest frame here, at 842 mm standover
Size
S
Height
5'3"-5'7"
Height cm
160-170
Standover cm
71.4
Fit note
Standover clears at 714 mm, the lowest frame here
Size
M
Height
5'7"-5'11"
Height cm
170-180
Standover cm
75.4
Fit note
Most riders start here
Size
L
Height
5'11"-6'3"
Height cm
180-190
Standover cm
79.9
Fit note
Reach is 416 mm, so confirm it before stepping up from M/L
Size
XL
Height
6'3"-6'7"
Height cm
190-200
Standover cm
84.2
Fit note
Tallest frame here, at 842 mm standover
Escape standover climbs 128 mm from S to XL, the largest standover step of the four sections on this page. Escape Disc and Cypress publish the same four bands, so this table answers them as well; FastRoad AR adds an ML band between M and L.
Starter kit
Helmet, light, lock, bottle, and a pant-leg strap. Size the bike here; buy the complete adult bike at a shop.
NiteRider
Swift 300
Compact USB headlight for commuting and dusk rides.
Handlebar mount, 300 lumens
View on AmazonPrice and availability on Amazon
Kryptonite
Evolution Mini-7 with 4′ cable
Hardened U-lock plus a cable for wheels or a locked-together pair.
Fits most road, gravel, and hybrid frames
View on AmazonPrice and availability on Amazon
CamelBak
Podium Chill 21 oz
Insulated squeeze bottle for everyday rides.
Fits a standard ~73 mm cage
View on AmazonPrice and availability on Amazon
Green Guru
Narrow pant-leg strap
Upcycled inner-tube strap that keeps a pant leg off the chain.
Adjustable hook-and-loop, about 16 in long
View on AmazonPrice and availability on Amazon
As an Amazon Associate we earn from qualifying purchases. Affiliate disclosure.
Start with height. If two sizes overlap, use cycling inseam to choose.How to measure
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 publishes no rider inseam for adult bikes. Every table on this page carries height only, and the standover column comes from a named frame's geometry table.
Giant vs Trek vs Specialized at the same height
Road sizing only. Match by published height range, not by label.
Height
Trek
Giant
Specialized
5'2"-5'7"
S / 52
XS
49 / S
5'5"-5'9"
M / 54
S
52 / M
5'7"-5'11"
M / 54
M
54 / M
5'10"-6'2"
ML / 56
M/L
56 / L
6'0"-6'4"
L / 58
L
58 / XL
6'2"-6'6"
XL / 61
XL
61 / XL
Height
5'2"-5'7"
Trek
S / 52
Giant
XS
Specialized
49 / S
Height
5'5"-5'9"
Trek
M / 54
Giant
S
Specialized
52 / M
Height
5'7"-5'11"
Trek
M / 54
Giant
M
Specialized
54 / M
Height
5'10"-6'2"
Trek
ML / 56
Giant
M/L
Specialized
56 / L
Height
6'0"-6'4"
Trek
L / 58
Giant
L
Specialized
58 / XL
Height
6'2"-6'6"
Trek
XL / 61
Giant
XL
Specialized
61 / XL
Popular Giant models
Confirm geometry on the Giant product page for the exact year.
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 suits 5'10"-6'1" riders who fall between M and L. Talon and Escape do not publish it.
Giant bike FAQ
Short answers for choosing a Giant frame before purchase.
What size Giant bike should I get?
Start with the published height range for the family you are buying. The road and mountain ladders run XS to XL, and the hybrid ladder starts at S. A 170 cm rider lands in S on the road, gravel, mountain and hybrid tables. Confirm with the model's own geometry, because a TCR compact size is not a Talon S.
What size Giant bike for a 170 cm rider?
170 cm sits in S on the road, gravel, mountain and hybrid ladders, so one size answers every Giant family. The hybrid ladder is the only one that also covers the next size up, M. Giant publishes no rider inseam, so confirm the standover of the exact model before buying.
Is Giant M/L right for me?
Giant's M/L is a half-size between M and L on the road and gravel frames, covering 177-187 cm. Take it when M feels short and L feels stretched. Talon and Escape do not publish an M/L.
Are Giant bike sizes in cm or inches?
Giant uses alpha labels (S, M, M/L, L, XL) for adult bikes. The frame geometry is published in millimeters and the rider height range in centimetres, but the sizing label is the primary fit reference.
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.