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Old 05-28-2011, 12:17 PM   #1
unswift
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One Impact Rule for Helmets

I had a high speed low-side in the carousel at MSRH. As I was making full-frontal love to the pavement and pushing the bike away from me with my feet, it looks like the lower front of the helmet in the chin area bumped and scraped. See the photo below.

It was not a concussion force impact, but my jaw was a bit tender afterward.

Shoei is pretty harsh on this. Warning labels and manuals say the helmet is designed for one impact, and at the least I need to send it back to the manufacturer for inspection, and at worst I need to trash the helmet.

So, the question is, do you think the "impact" I had (more of a glancing blow/scrape than a direct hit) means is is "time to trash" a $450 helmet?
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Old 05-28-2011, 12:23 PM   #2
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I would keep wearing it if there are no cracks
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Old 05-28-2011, 12:23 PM   #3
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check the condition of the EPS inside the helmet to see any signs of damage.....
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Old 05-28-2011, 12:30 PM   #4
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Quote:
Originally Posted by sunday_rider View Post
check the condition of the EPS inside the helmet to see any signs of damage.....
Interior looks great, but Shoei manuel says you might not see the damage but that the "impact absorbing liner" will have been compressed and will have used up its "one impact."
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Old 05-28-2011, 12:48 PM   #5
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Quote:
Originally Posted by unswift View Post
Interior looks great, but Shoei manuel says you might not see the damage but that the "impact absorbing liner" will have been compressed and will have used up its "one impact."
you can usually see if the EPS has been compressed or not once you take it apart.
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Old 05-28-2011, 12:56 PM   #6
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Quote:
Originally Posted by sunday_rider View Post
you can usually see if the EPS has been compressed or not once you take it apart.
I'll give it a look. I've pulled out the liners, but I'm not sure how the other stuff comes out.
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Old 05-28-2011, 01:02 PM   #7
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One impact. Your head isn't worth the chance
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Old 05-28-2011, 01:23 PM   #8
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Quote:
Originally Posted by unswift View Post
I'll give it a look. I've pulled out the liners, but I'm not sure how the other stuff comes out.
Is it glued to the shell? Mine snaps off pretty easy.
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Old 05-28-2011, 01:42 PM   #9
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Quote:
Originally Posted by sunday_rider View Post
Is it glued to the shell? Mine snaps off pretty easy.
Might be glued in. Does not seem to snap out with moderate force.
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Old 05-28-2011, 02:00 PM   #10
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Quote:
Originally Posted by bluewave18 View Post
I would keep wearing it if there are no cracks
+1

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Old 05-28-2011, 02:24 PM   #11
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I low sided at TWS (Texas World Speedway) last year.. Needless to say this one is sitting on the shelf now.

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Old 05-28-2011, 03:06 PM   #12
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Don't take a chance...trash it. I know $$$ is tight but it's not worth your health!
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Old 05-28-2011, 04:54 PM   #13
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Quote:
Originally Posted by bluewave18 View Post
I would keep wearing it if there are no cracks
NO.

"no visible cracks" is NOT insurance against the helmet being bad. It can have hidden cracks, or minute hairlines. EPS material can be compromised. Retention systems may now be faulty.


the helmet has seen an impact, it protects your brain.



stick it on a shelf, make it look pretty and REPLACE IT.
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Old 05-28-2011, 05:42 PM   #14
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That little smidge??? I'd still use it.
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Old 05-28-2011, 07:03 PM   #15
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I'd probably wear it still.
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Old 05-28-2011, 09:03 PM   #16
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I've looked over the interior shell. The styrofoam lining near my forehead is slightly crinkled, but that would not surprise me with the (now I tell you guys), the two high speed low-sides this helmet has seen. The rest of the interior lining is pristine, with virtually no sign of trauma or impact.

The first lowside saw no real "hard" impact. I went tumbling in the grass at about 70mph and there were very slight scuffs from that. This most recent highside (85 mph?) actually had an "impact" on the helmet, as pictured in the photo in the first post, but no real "slamming" of the helmet into the ground.

My thought is, "hey, that wasn't a serious impact, more of a glancing blow, and it wasn't in the upper cranial area of the helmet, so I should be good to go."

So now you have more information. Part of me is with the "just trash the helmet, your brain is too important" crowd. The other is wondering if I'm giving up on a high quality helmet that has not yet seen it's true life ending "impact."
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Old 05-28-2011, 10:03 PM   #17
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Errr...two accidents? Shelf it!
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Old 05-28-2011, 10:13 PM   #18
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My vote changes to trash it if there is visible damage to the interior. This also might make you consider a mouth guard for trackdays if you haven't already.
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Old 05-28-2011, 10:15 PM   #19
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Shoei will inspect the helmet for free if you send it in to them.
I've bounced my head off more concrete than I care to remember.
Imo if the helmet hits the ground with my head in it then there's a good chance it's lost some of it's ability to protect my brain from another impact. The way I look at it I'd rather spend the cash than spend the rest of my days having someone wiping up my drool.
My 2 cents ymmv.
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Old 05-29-2011, 12:12 AM   #20
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Quote:
Originally Posted by Patrick View Post
Imo if the helmet hits the ground with my head in it then there's a good chance it's lost some of it's ability to protect my brain from another impact.

Exactly!

What most people forget is the EPS stress against the head, during an accident. Even if the impact is minimal to the ground, the internal stresses slammed against the skull is what matters then. It has been crushed. Maybe even the slightest minimal amounts, but it has been compromised in some way.

This is why helmets are recomended to be replaced every few years by the manufacturers. Daily wear and tear builds up, thus decreasing the safety "net" of the interior. (I had a few coworkers over some years who dont ride, and as a "joke" slam thier hand against my helmet, as I was about to leave work. I assure you, I ended up with a long ANGRY conversation with them, and in the end, a brand new helmet, purchased by them. and a little wiser on helmet safety )

Can they still be "safe"? Yes. But to what extent? Unlike football, and other sport related helmets, they are not meant to be consistenly banged up. In essence, a motorcycle helmet is a "crumple zone" (like a car has) but, for your head. And we cant tell what direction the next impact is going to be from. I would hate for the compromised area, to be hit again (and possibly with a lot more force: )


I would follow Patrick recommendation. Send it back. Some companies may not inspect, and send back...but at least it serves an evaluation purpose for that helmet company. I did this with my Scorpion EXO 400. It did it's job, and doing a secondary one, by letting them (Scorpion) R&D thier end product, to produce better helmets. WIN WIN, as I see it.
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