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Giro helmet size chart

The 10 Giro helmets we track cover heads from 51 to 65 cm (20.1 to 25.6 in). A Giro L is not the same as an L from another brand — here are the real numbers.

Giro helmet sizes in cm and inches

Every Giro model in our database, with the head circumference each size actually covers. 8 of 10 came from Giro's own size chart; the rest are from retailer listings and still need confirming with the brand.

ModelRidingSizesSafety (VT)Price
Agilis MIPSRoad
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
Not rated~€60View
Aries SphericalRoad
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
★★★★★ 5/5Check priceView
Eclipse SphericalRoad
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
★★★★☆ 4/5~€179View
Fixture II MIPSMTB, Urban
Universal Adult — 54-61 cm (21.3-24.0 in)
Not ratedCheck priceView
Fixture II MIPS XLMTB, Urban
Universal XL — 58-65 cm (22.9-25.5 in)
Not ratedCheck priceView
Helios SphericalRoad, Gravel
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
★★★★☆ 4/5Check priceView
Manifest SphericalMTB
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
★★★★☆ 4/5~€127View
Radix MIPSMTB
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
XL — 63-65 cm (24.9-25.5 in)
Not rated~€87View
Syntax MIPSRoad, Gravel
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
XL — 63-65 cm (24.9-25.5 in)
★★★☆☆ 3/5~€150View
Tyrant SphericalMTB
S — 51-55 cm (20.1-21.6 in)
M — 55-59 cm (21.7-23.2 in)
L — 59-63 cm (23.3-24.8 in)
★★★★☆ 4/5Check priceView

Which Giro size am I?

Measure your head first (tape or string around the widest part, 1-2 cm above the eyebrows), then read it off the table above — Giro sizing is not the same as the next brand's. Across the range, Giro covers 51 to 65 cm (20.1 to 25.6 in). If your measurement falls outside that, no Giro helmet we track will fit you.

Jump to your measurement

Comparing Giro against other brands? The finder shows your size in every brand at once, from one measurement.

Find my size

Safety ratings

6 of these 10 Giro models have been crash-tested by the Virginia Tech Helmet Lab, whose STAR ratings are independent of the brands. Where we show nothing, the model has not been tested — that is not the same as testing badly.

See the full safety ranking.

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