Man får välja vem man lyssnar på. "Det var ett tyskt test som lagrade hjälmarna i tio år och dom tappade bara 10-15% så att använda dom hur länge som helst går toppen"
Eller samtliga hjälmtillverkare
Riding with a helmet is imperative – if you own a bike, you should own a bicycle helmet, too. That’s because, without it, you’ll be opening yourself up to easily avoidable injury and possibly even death. Even the best mountain bike helmets need to be replaced over time due to the degradation of...
off.road.cc
"Yes, but that's not necessarily because the expanded polystyrene foam degrades over time, as April Beard,
Bontrager's(link is external) product manager for helmets, explains: "It really depends on how good care you take of the helmet. There is no evidence that the EPS liner will deteriorate with age. Still, there are things such as solvents, chemicals, and environmental exposure that can degrade the performance of the helmet."
"Paul Caswell, the senior brand manager for Giro and Bell helmets' distributor ZyroFisher, agrees: "We normally recommend a new lid every three years, depending on usage, as even with no impacts, there is a constant knocking and pressing of the EPS as the helmet is stored, dropped, placed on hard surfaces, etc. Due to tiny impact after tiny impact over time, the EPS will gradually lose its volume, making it less able to deal with the energy in the unfortunate event of an impact. Of course, the more the helmet is used, the more it will deteriorate, so one rule for all does not work here, but three years is a good guide."
Jag tycker en årskostnad på 400kr för en hjälm är okej, så jag kommer byta mina efter ett par års användning för att vara säker
Att låta den ligga i lagring verkar som sagt inte vara problem. Men att använda den?
Bicycle helmet foam liners absorb energy during impacts. Our goal was to determine if the impact attenuation properties of expanded polystyrene (EPS) foam used in bicycle helmets change with age. Foam cores were extracted from 63 used and unused bicycle helmets from ten different models spanning...
asmedigitalcollection.asme.org