Giro helmet size chart
The 8 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. 5 of 8 came from Giro's own size chart; the rest are from retailer listings and still need confirming with the brand.
| Model | Riding | Sizes | Safety (VT) | Price | |
|---|---|---|---|---|---|
| Aether Spherical | Road | 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 | ~€181 | View |
| Agilis MIPS | Road | 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 | ~€60 | View |
| Eclipse Spherical | Road | 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 | ~€179 | View |
| Fixture II MIPS | MTB, Urban | Universal Adult — 54-61 cm (21.3-24.0 in) | Not rated | Check price | View |
| Fixture II MIPS XL | MTB, Urban | Universal XL — 58-65 cm (22.9-25.5 in) | Not rated | Check price | View |
| Manifest Spherical | MTB | 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 | ~€127 | View |
| Radix MIPS | MTB | 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 | ~€87 | View |
| Syntax MIPS | Road, 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 | ~€150 | View |
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
- 51 cm: 6 Giro models
- 52 cm: 6 Giro models
- 53 cm: 6 Giro models
- 54 cm: 7 Giro models
- 55 cm: 7 Giro models
- 56 cm: 7 Giro models
- 57 cm: 7 Giro models
- 58 cm: 8 Giro models
- 59 cm: 8 Giro models
- 60 cm: 8 Giro models
- 61 cm: 8 Giro models
- 62 cm: 7 Giro models
- 63 cm: 7 Giro models
- 64 cm: 3 Giro models
- 65 cm: 3 Giro models
Comparing Giro against other brands? The finder shows your size in every brand at once, from one measurement.
Find my sizeSafety ratings
4 of these 8 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.