Do they effect helmet preformance?
In my personal opinion it doesnt matter a jot whether or not the chinstrap is loose.
My daughter on the other hand keeps her helmet correctly fitted and the straps the correct length, it is one of the first things that they learn when joining the cycling club. The instructors do tend to maintain standards on this issue and not just give it lip service.
I believe I addressed this in an earlier post so why continue down that line?Just to confirm a few things for you.
1.My son is a member of a CC and knows exactly how his helmet should fit and how to do so.
2.I've been wearing helmets(Moto-X/Motorcycle/Cycling for 40+ years so know exactly how one should fit.
3.If there was an issue it would be addressed by one of the coaches before the session.
Said helmet in the photo was brand new and it was the first time out in the field so to speak.I did not realise until we were riding that said helmet suffered from a problem that seems to blight all Planet-X helmets..ie the chin straps slip slightly.This was rectified on the ride and is now sorted.
It seems strange that you keep highlighting his helmet and helmets in general when it's not
are wanting to make this a helmet debate with constantly going over the same ground.If you have nothing to say about anything other than helmets then i would suggest you don't say anything further at all.
@Tangled Metal.TBH the straps on some helmets(mine included) are just one part of the securing system.The internal headring on my Kask holds my helmet firmly in place if adjusted correctly.Unfortunately his head isn't big enough yet for an adult helmet though and the headring on Youths helmets aren't quite as adjustable.