Diamondback Sierra
Tested in 2026
Adult
Road
Score
48.5
out of 100
Star rating
3/5 Stars
Price
$
$
$
$
under $80
Performance
Specifications
Performance
Each metric is weighted differently based on crash severity. Scores combine to create the overall 100-point rating.
Helmet coverage
4.7
/ 6
Retention system strength
4.0
/ 6
Head protection in low-speed impact
8.0
/ 12
Angular head impact protection
13.4
/ 32
Head protection from concentrated impact
6.5
/ 8
Head protection in higher-speed impact
2.1
/ 12
Head protection variability in higher-speed impact
1.0
/ 2
Head protection variability in low-speed impact
1.0
/ 2
Helmet stability in a crash
3.0
/ 6
Head protection in standard-speed impact
4.9
/ 12
Head protection variability in standard-speed impact
0.0
/ 2
Total
48.5
/ 100
Specifications
Model
Sierra
Brand
Diamondback
Size
S/M and M/L
Helmet Type
Road
Weight (Average from 3 sizes)
291g
Shell/Liner material
PVC or Polycarbonate
AIMS
NO
Retention System
Quick Release
Price Range
$ (under $80)
Certification standard(s)
AS/NZ 2063:2008
