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If your helmet is on your head and adjusted so it is tight,should you with relative ease (one finger) be able to push the front of it and have it slide over your skull so that it only remains attached to your person by virtue of the fact the chin strap is now around your neck?
I was fitted for a helmet today (Kask Mojito) and although it is very comfortable and appear to fit I have discovered tonight after playing around with it this condition exists.
It feels secure in every other way.
Perturbed that I can push it off my head though.
I've honestly never tried. I just tighten mine till it feels snug and doesn't move when i shake my head hard. So i guess i could lift it off with one finger. The chin strap should be snug too but not tight enough to be uncomfortable while talking.
Both my Specialized helmets fit so nicely, without straps done up they don't move and don't rotate off, so nice and secure with straps on. Know they work as well, stacked it the other week, clean onto the front and the helmet stayed put, took the damage, job done.
I took the helmet back to the store today and showed the assistant what my concerns were. He explained that all helmets on all heads will exhibit this. I was worried what the helmet may do in a frontal impact scenario as my helmet was able to come away from my skull totally. He offered a refund or another helmet which I thought was good. Unfortunately there was no helmets in stock I liked.
Which helmets offer good security around £100?
I like the look of the Specialized Propero 2.
The helmet will be used for every type of biking.
Pushing the front of your lid vertically upwards (from your brow) would probably lift it off your head, but pushing horizontally on it shouldn't move it appreciably IMO, unless you have no perceptible brow, or the helmet's designed to sit way high on your head (unlikely, given it's role in life).
It's crucial that your lid fits well all over your head, (FIT) and that it doesn't move around much during an impact (FIT & CHIN STRAP TENSION). If it's not snug against your bonce the polystyrene wont dissipate the force of the impact as it's supposed to. Least that's always been my understanding of it, same for motorcycle lids too. I've just survived a high speed OTB head-plant which rote off my Fox Flux. I've replaced it with another one as it was an excellent fit, and had proved itself in service! (thankfully).
Helmet fit is really important - if you are not sure, try more until it fits.
Modern helmet 'head clamping' systems still favour certain heads IMO, but are massively better than they used to be (velcro pads anyone?)
I really rate my Uvex fitting system - it seems to grip head better all round, and adjusts for height/shape inside more than others.
The kids and mrs_OAB have all sorts of makes - best one for adjustment is the Giro. The Trek is poor/old fashioned stylee 'push ratchet', the Met is the one that sends the helmet backwards off the back of a head if you have a small noggin.