REF · 19300E4006206
5/5 VT
REF · R41175
Adult NOCSAE ✓
Riddell →
Riddell SpeedFlex Diamond helmet
Adult helmets
Discontinued by the manufacturer · still in stock at some retailers
5/5
Virginia Tech rating
Score 1.69 · ranked 15 of 40 helmets · tested in 2020. The lower the score, the better.
0 offers · prices checked
No European offer found yet.
Affiliate links: we earn a commission at no extra cost to you. Indicative prices, check them with the retailer.
In short
The SpeedFlex Diamond by Riddell belongs to our « Adult helmets » category. Level: Adult. Certification: NOCSAE. Rated 5/5 stars by Virginia Tech (tested in 2020).
Pros
- 5 Virginia Tech stars, score 1.69 (15th of 40)
- Six head sizes, from 52 cm to over 62 cm
- Compatible with 13 SpeedFlex-platform facemasks
Cons
- Removed from the official Riddell catalogue (confirmed 2026-10-17)
- No offer found at a European retailer
- Not found in the SEI certification database we checked
Strengths and weaknesses drawn from the verified manufacturer and Virginia Tech data. Our field-test verdict will follow.
Specs
| Reference | R41175 |
|---|---|
| Category | Adult helmets |
| Level | Adult |
| Sizes | 1, 2, 3, 4, 5, 6 |
| Weight measured by Virginia Tech | 2,177 g |
| Compatible facemasks | SF-2BD, SF-2BD-SW, SF-2BD-HD, SF-2BDC, SF-2BDC-HD, SF-2BDC-TX-HD, SF-2EG-II, SF-2EG-II-HD, SF-2EG-SW, SF-2EG-SW-HD, SF-2EG-TX-HD, SF-3BD, SF-KICKER |
| Certification | NOCSAE |
| Virginia Tech | ★★★★★ · score 1.69, 15 of 40 (2020) |
Sources: Riddell website, Virginia Tech Helmet Ratings, SEI. Missing data is left out rather than guessed.
Which positions?
The manufacturer does not target a specific position.
Level: Adult.
QBQuarterbackRBRunning backWRWide receiverTETight endOLOffensive lineDLDefensive lineLBLinebackerDBDefensive backKKicker / punter
Size guide
- 1
- 2
- 3
- 4
- 5
- 6
| Size | Measurement (manufacturer) |
|---|---|
| 6 1/2–6 3/4 | Head circumference: 52–54 cm (20 3/8–21 1/8 in) |
| 6 3/4–7 | Head circumference: 54–56 cm (21 1/8–22 in) |
| 7–7 1/4 | Head circumference: 56–58 cm (22–22 3/4 in) |
| 7 1/4–7 1/2 | Head circumference: 58–60 cm (22 3/4–23 1/2 in) |
| 7 1/2–7 3/4 | Head circumference: 60–62 cm (23 1/2–24 1/4 in) |
| Over 7 3/4 | Head circumference: over 62 cm (over 24 1/4 in) |
Measure around the head with a soft tape measure, about 2.5 cm (1 in) above the eyebrows. If you fall between two sizes, Riddell recommends starting with the smaller one. The Diamond needs no inflation: if it sits too high, go up a size; too low, go down a size. Riddell offers four face frame thicknesses for the jaw area.
Sizes and measurements published by the manufacturer. Check its size chart before ordering. Official size chart
Same range
SF Echo helmet
5/5
€668.99
SF-2BD-SW facemask
—
€128.91
SF-KICKER facemask
—
€170.00
SpeedFlex helmet
3/5
€459.90
SpeedFlex II helmet
4/5
—
SpeedFlex ND6 helmet
5/5
€379.00
SpeedFlex Youth helmet
4/5
€424.95
Alternatives
Same category · another brand
Adult helmets
NOCSAE ✓
REF · X2EV-21X-1010-A-S
5/5 VT
REF · XEHMSHW
3/5 VT
FAQ
Is the SpeedFlex Diamond still on sale?
No: as of 2026-10-17 it no longer appears in Riddell's Varsity catalogue (only the Axiom 3D, Axiom, SF Echo, SpeedFlex, Speed Classic Icon and Speed Icon are listed there), and we found no European retailer selling it. The model is considered discontinued.
How does it differ from the standard SpeedFlex?
The Diamond replaces the inflatable liner with 3D-printed lattice padding (Carbon DLS technology), with no bladders to pump up. Virginia Tech rates it 5 stars (score 1.69), against 3 stars (4.49) for the standard SpeedFlex.
Which size should I choose?
Riddell offers the Diamond in six sizes, from 52–54 cm up to over 62 cm head circumference. Measure about 2.5 cm above the eyebrows and, between two sizes, start with the smaller one.
How should I look after the SpeedFlex Diamond?
Riddell asks you to use only its own cleaners and waxes, as off-the-shelf products may damage the shell or the liner.