Bell RS7-K Pro Karting Helmet - K2025 / FIA8878
Bell RS7-K Pro Karting Helmet - K2025 / FIA8878
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The Bell RS7‑K Pro Karting Helmet – K2025 is a premium, competition‑grade helmet engineered for serious kart racers. Featuring a lightweight composite shell inspired by Bell’s HP7 pro‑racing design, dual Snell K2025 and FIA 8878‑2024 certifications ensure top‑tier safety and performance. The advanced ventilation and optical‑grade Double Screen Anti‑Fog (DSAF) visor deliver clear vision and cooling on demanding tracks. A kart‑specific, comfortable interior and SmartLock visor system make it ideal for long sessions and competitive racing.
Size Guide
| Head size (cm) | Head size (in) | Bell numeric size | Letter size | US hat size |
|---|---|---|---|---|
| 51 | 20.1 | — | 4X-Small | 6 3/8 |
| 52 | 20.5 | 52 | 3X-Small | 6 1/2 – 6 5/8 |
| 53 | 20.9 | 53 | — | — |
| 54 | 21.3 | 54 | XX-Small | 6 3/4 – 6 7/8 |
| 55 | 21.7 | 55 | X-Small | 7 |
| 56 | 22.0 | 56 | — | — |
| 57 | 22.4 | 57 | Small | 7 1/8 – 7 1/4 |
| 58 | 22.8 | 58 | Medium | 7 1/4 – 7 3/8 |
| 59 | 23.2 | 59 | — | — |
| 60 | 23.6 | 60 | Large | 7 1/2 |
| 61 | 24.0 | 61 | X-Large | 7 5/8 – 7 3/4 |
| 63 | 24.8 | — | XX-Large | 7 7/8 – 8 |
| 65 | 25.6 | — | 3X-Large | 8 1/8 – 8 1/4 |
| 67 | 26.4 | — | 4X-Large | 8 3/8 – 8 1/2 |
How to measure: run a tape around your head at the widest point, about 2.5 cm (1 in) above your eyebrows and just above your ears.
Bell's numeric sizes ARE your head circumference in centimetres. If you measure 58 cm, you buy a 58. The carbon and Pro helmets (GT6, RS7, HP6, HP7, HP10, M.8 Carbon, GP3, GTX.3, Mag-10 Pro, KC7 karting) are sold this way.
Bell's Sport-line helmets use letter sizes instead — K.1 Sport, K.1 Pro, M.8, M.8 Sport, Sport Mag, Mag Open Face, GP3 Sport, BR8 Air, Mag Rally and RS7-K Pro. Use the Letter size column for those.
Intermediate sizes (56+, 57-, 59+, 61+) are in-between fits offered on some carbon and Pro shells for a head that falls between two whole centimetres. Bell does not publish a measurement for them, so if you land between sizes send us your measurement and we will tell you which one to take.
A racing helmet should be snug. It should not rotate independently of your head, and after ten minutes on you should feel even pressure with no hot spots. Inches are converted from Bell's centimetre figures and rounded.
Source: Bell Racing USA official size guide.
Sizing is from the manufacturer and varies between brands. Measure yourself and compare against the table rather than ordering your usual street size.