Trek helmet size chart
The 3 Trek helmets we track cover heads from 51 to 66 cm (20.1 to 26.0 in). A Trek L is not the same as an L from another brand — here are the real numbers.
Trek helmet sizes in cm and inches
Every Trek model in our database, with the head circumference each size actually covers. 0 of 3 came from Trek's own size chart; the rest are from retailer listings and still need confirming with the brand.
| Model | Riding | Sizes | Safety (VT) | Price | |
|---|---|---|---|---|---|
| Circuit WaveCel | Road | S — 51-57 cm (20.1-22.4 in) M — 54-60 cm (21.3-23.6 in) L — 58-63 cm (22.9-24.8 in) XL — 60-66 cm (23.7-25.9 in) | ★★★★☆ 4/5 | ~€157 | View |
| Rally WaveCel | MTB | S — 51-57 cm (20.1-22.4 in) M — 54-60 cm (21.3-23.6 in) L — 58-63 cm (22.9-24.8 in) XL — 60-66 cm (23.7-25.9 in) | ★★★★☆ 4/5 | Check price | View |
| Solstice Mips | Urban, Road | S/M — 51-58 cm (20.1-22.8 in) M/L — 55-61 cm (21.7-24.0 in) | ★★★★☆ 4/5 | Check price | View |
Which Trek 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 — Trek sizing is not the same as the next brand's. Across the range, Trek covers 51 to 66 cm (20.1 to 26.0 in). If your measurement falls outside that, no Trek helmet we track will fit you.
Jump to your measurement
- 51 cm: 3 Trek models
- 52 cm: 3 Trek models
- 53 cm: 3 Trek models
- 54 cm: 3 Trek models
- 55 cm: 3 Trek models
- 56 cm: 3 Trek models
- 57 cm: 3 Trek models
- 58 cm: 3 Trek models
- 59 cm: 3 Trek models
- 60 cm: 3 Trek models
- 61 cm: 3 Trek models
- 62 cm: 2 Trek models
- 63 cm: 2 Trek models
- 64 cm: 2 Trek models
- 65 cm: 2 Trek models
Comparing Trek against other brands? The finder shows your size in every brand at once, from one measurement.
Find my sizeSafety ratings
3 of these 3 Trek 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.