Knut-Erik Helle

@helle.eco

488 Followers 475 Following

Only truly at home in the boreal forests of Norway, avid year-round cyclist, enjoy photographing and just love fixing stuff. Environmental communications specialist.✊Earth first! (🖼️ Namdalseid, Norway. Photo: Knut-Erik Helle)

Svalt å sykle i skogen selv i 30 °C. Østmarka, opp bakkene fra Haugerud. (Foto: Knut-Erik Helle)
Syklist på vei opp til Sarabråten i Østmarka, Oslo kommune. Kraftig regnskyll har vasket ut deler av grusveien. (Foto: Knut-Erik Helle)
Sykling forbudt-skilt i Østmarka nasjonalpark.
Orphaned spotted leopard cub at a forest ranger station in the Bardiya National Park in the Terai lowlands of Nepal. (Photo: Knut-Erik Helle)
Shaggy Bumblebee (Bombus wurflenii), Dovre, Norway. (Photo: Knut-Erik Helle)
Kilde: TØI, 2025: https://www.toi.no/getfile.php?mmfileid=80227
Practical evidence-based recommendations Based on the scientific literature, forensic testing, and expert consensus from sources without financial conflicts: Scientific evidence does NOT support replacement solely based on: - Time elapsed since purchase (if no visible damage and good storage) - Calendar age of unused or lightly-used helmets stored indoors - Manufacturer claims about "outgassing" or foam "drying out" - Fear of sweat degradation (not supported by testing) - Three-year manufacturer recommendations (too conservative per independent experts) Replace immediately if: - The helmet has been in any crash or impact - Visible cracks appear in foam or shell - Straps show significant fraying, stiffness, or breakage - Buckles crack, fail to hold, or won't adjust - The helmet cannot achieve a secure, stable fit - Severe fading or cracks appear around vents (UV degradation) - Any delamination occurs between shell and foam Inspect regularly for: - Strap condition: color fading (early sign), fraying, stiffness, strength - Shell integrity: especially around vents where stress concentrates - Foam compression: from storage or repeated minor impacts - Fit system: pad compression, adjuster function, overall security - Buckle function: positive engagement, no cracks or deformation Consider replacing if: - Helmet shows moderate UV damage: significant fading, surface chalking - Five years have passed with heavy use and outdoor storage - Straps show color change or early stiffening (precursor to strength loss) - Desire for improved technology (MIPS, better ventilation, lighter weight) - Comfort has declined due to pad compression (Sources: https://link.springer.com/article/10.1007/s10439-017-1842-4, https://www.meaforensic.com/the-bike-helmet-a-life-saver-with-limitations/, https://helmets.org)
Selvforsyningsgraden til utvalgte land. Kilde: https://link.springer.com/article/10.1186/s40066-025-00570-z
Gaston Lagaffe, Viggo med motorhjelp på sykkel.
Trafikkskilt 144.0
Cycling in the forests of Oslo in early spring. (Photo: Knut-Erik Helle)
Mykt bymiljø... AI-generert bilde, Adobe Firefly / Gemini.
Ti tips til å kutte forbruket av fossilt drivstoff fra Det internasjonale energibyrået.
Lysaker river in Oslo caught in the blue hour of the evening. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Andel av reiser på sykkel fra 2013 til 2025 for Oslo kommune. (Kilde: https://www.vegvesen.no/vegprosjekter/nasjonal-transportplan/den-nasjonale-reisevaneundersokelsen/ og https://www.vegvesen.no/vegprosjekter/nasjonal-transportplan/den-nasjonale-reisevaneundersokelsen/reisevaner-2025/)
A flower filled lake deep inside the subtropical forests of Chitwan national park, Terai, Nepal. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Nedsnødd adgangspanel.
Bicycle covered in bread.
Retronyms used for a bicycle * Analog bicycle * Acoustic bicycle * Bread bicycle * Muscle bicycle * Manual bicycle * Regular bicycle * Non-electric bicycle * Push bicycle
Berries of a Wild apple tree I think (A malus species), in early winter frost.
Kilde: TØI/2025 https://www.toi.no/getfile.php?mmfileid=80227
Andel av reiser på sykkel fra 2013 til 2024 for Oslo kommune. (Kilde: https://www.vegvesen.no/vegprosjekter/nasjonal-transportplan/den-nasjonale-reisevaneundersokelsen/)
Opinion har spurt folk i Oslo "Bør voksne syklister (eldre enn 15 år) ha lov til å sykle på fortauet?".
Ciona. (Photo: Perezoso / Wikimedia / CC BY-SA 3.0)
Video: NRK. https://www.nrk.no/stor-oslo/emma-og-kathinka-blir-forste-mor-datter-duo-til-sydpolen-1.17625112
Late autumn eastern city forests of Oslo after days with heavy rain. (Foto: Knut-Erik Helle / CC BY-NC-ND 4.0)
Roadside alcohol breath tests per 1000 inhabitants for selected European countries, 2020. Source: ETSC - https://etsc.eu/wp-content/uploads/ETSC_PINFLASH42_v2TH_JC_FINAL_corrected-060522.pdf
Photo: Acer press
Mineralolje til lufting av hydrauliske sykkelbremser. Bruker Citroëns bremse- og hydraulikksystemer for biler fra 1967 og nyere... Også perfekt til både Shimano og Tektro =)
Fjellvegg tilrettelagt for buldring, med "forbudt med klatring"-skilt. Eidene, Tjøme. (Foto: Knut-Erik Helle / CC BY-NC-ND 4.0)
Breaking tracks forest gravel road. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Dagbladet: Råner spyr eksos etter Greta Thunberg.
Four mammals taking a bath in Rapti river, Terai lowlands of Nepal. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Speeding tickets per 1000 inhabitants for selected countries in Europe. Source: https://etsc.eu/wp-content/uploads/ETSC_PINFLASH42_v2TH_JC_FINAL_corrected-060522.pdf
Bicycle express road between Stavanger and Sandnes, Norway. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Summer sky reflected in perfect calm boreal forest lake with a deadwood trunk. Østmarka city forest, Oslo. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Fotograf ukjent.
(Foto: Knut-Erik Helle / CC BY-NC-ND 4.0)
Aconitum septentrionale, Dovre, Norway. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
Hellfire cemetery in Oslo. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)
The Pulpit Rock, Lysefjorden, Norway. (Photo: Knut-Erik Helle / CC BY-NC-ND 4.0)