|11-22-2013, 02:33 PM||#62|
Joined: Jul 2011
Supposedly the foam starts to get brittle, right?
If I could be anywhere right now, I'd still be out there, on my bike, in the wilderness.
2010 Concours 14
|11-23-2013, 08:24 PM||#63|
Joined: May 2006
Location: Gray's Harbor
AFAICT, the primary reason for recommending helmet replacement on a regular interval is that this is a standard risk management technique for personal protective equipment. Brand new equipment has a known history and the components can be confidently counted on to behave as designed. The older the equipment gets, the less certain one can be about whether (for example) it's suffered damage from too much UV exposure (how many hours in the sun was it exposed to? How many of those hours were of direct exposure of the interior?), petroleum vapors (Did the owner, or previous owner, store the helmet near a gasoline can? Did they routinely set it on their bike's fuel system vent?), or corrosive materials (have the rivets in the retention system started to rust?).
Most of this potential damage is not visible to the eye (for example, the EPS foam can be damaged in many ways not visible, particularly since it's almost never a solid block, and it's properties rely on it's configuration as well as it's chemistry), and non-destructive testing via other means is:
a) too expensive for most individuals
b) requires specific skills, again not held by most individuals
c) incurs a legal liability on the part of the individual/organization doing the testing
Recommending helmet replacement on a routine schedule minimizes user risk as part of a comprehensive approach to risk management. Other aspects of that approach are:
a) regular inspection of the condition of the helmet
b) careful attention to the storage environment of the helmet, so that exposure to degrading factors is less likely to go unnoticed.
I'll get back in the saddle again if it kills me...
|11-25-2013, 10:03 PM||#64|
Out of the office.
Joined: Dec 2003
Location: Where the Ghetto meets the sea.
My street helmet is replaced every 5 years or less, normally around the 4 year mark.
My dirt helmet timing was stretched out a little longer.
Then I watched the effects of someone who had a slow speed mild but head hitting crash off road.
Knocked em silly.
This was a well known name brand off road helmet.
We cut the helmet in half. Mostly just to see what happens to a helmet that from the outside looked totally fine
While the wearer got a TBI.
Right on the top of the lid there was an area about 3.5 inches across where the EPS was profoundly compressed.
And had pulled away from the inner part of the outside.
The EPS was a touch crumbly, and the comfort foam was decidly less springy.
The helmet was 10 years old.
It was a wake up call and I went out and updated my off road and bicycle helmets.
Sure it could be a big scam, but when it comes to my head, I want every piece of help I can find.
On vacation for a spell
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