It is mostly a styling issue. But also it provides more room to allow for goggles to go on /off. Most full face street helmets are slightly shorter and more rounded to allow for a curved shield to seal against the surface of the helmet.
Do Dirt Riders Have Longer Chins?
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I always thought it opened up and extended to ensure that if there is another bike in front of you, you are certain to actually eat his dust 
Oh, without a doubt, it works great for that!I always thought it opened up and extended to ensure that if there is another bike in front of you, you are certain to actually eat his dust
Now I am too wondering if it has a function.
I've always thought that maybe it was more impact, which the helmet took before your face? When turning my head on the freeway, it's not exactly helpful. Way more side drag.
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