There has been a fair amount of discussion within the forum about grill positions on various helmets, so I've taken a few pictures to explain the big headed ogre problem that some of us have encountered.
My head size is 620mm around the headband and from middle of head between the ears to chin is 380mm.
I have a Masuri 610-630 helmet and an Ayrtek. Both have steel grills. I have only tested manufacturers grill on their own helmet. I will test all grills on the Ayrtek and Masuri helmets when I have the Albion grill. My requirement was to have the grill as far away from the face as possible, hence the screw positions visible. The pictures show the results.
Ayrtek Helmet, Ayrtek GrillThe grill is all but resting on my chin and doesn't drop down far enough to cover my chin. If I was hit by a bouncer, the grill would transfer most of the energy directly into my jaw! I couldn't use it like this.
Masuri Helmt, Masuri GrillThe grill is a distance away from my chin, about 10mm, maybe slightly less, and positioned lower. In order to achieve this, I have to have the aperture between top of the grill and peak at 60mm. This is not ideal as I wouldn't want the ball squeezing its way through.
I would prefer to use the Ayrtek grill due to its simple way of maintaining a 55mm gap between peak and grill, however to do this, I think Ayrtek probably need to make a grill for the slightly larger gents amongst us. I'm not sure if there are plans to do this. I think that all it would take is an extra 20mm of length on the longer strut, and maybe a minor angle adjustment of about 2 degrees to take the edge of the grill lower. I don't know how likely this is.
I'll update the thread with Albion and Masuri grills on the Ayrtek once I have the Albion grill.