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A lot of people on this site irder their helmets online. I've noticed that manufacturers have differences in sizing.
I found this guide to proper helmet fitment on the web at motorhelmets .com EnjoySizing Tips

Your helmet fit is not only critical to the comfort and enjoyment of your helmet, it also plays a critical role in the performance of your helmet in the event of a collision. Never purchase or wear a helmet without ensuring a snug fit. There are several methods and tricks to size a helmet. HJC recommends the following method.

1. Start with a helmet size you think will fit according to your measurements.
To access our measuring tape click here. ( Measuring Tape is only for Shoei, HJC & Arai. )

HJC, Shoei Helmet Measuring Tape

2. Put the helmet on by grasping the chin strap in each hand and pulling it on over your ears until you feel the top portion of the helmet touch. If the helmet immediately feels too tight, ie; your head does not touch the top of the helmet, you cannot pull the helmet down over your ears, or is painful, try the next size larger.

3. Once you have found a helmet that feels comfortable and snug, you must assure that it is not too loose. To do so, with the chin strap securely fastened (see chin strap diagram) grasp the helmet chin bar firmly with one hand and try to move the helmet from side to side and up and down. If the helmet slides on your skin and hair, it is too large. If your scalp and skin want to move with the helmet, the fit is snug.

4. Finally, while still grasping the chin bar, try to rotate the helmet as far down and forward as possible then as far backward as possible. If the helmet feels as if it might slide off in either direction, the helmet is either too big or the chin strap was not securely fastened. Additional note; HJC has a wide range of helmet sizes, but if for whatever reason you cannot find a HJC helmet to fit your head size or shape securely, keep looking.
 

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And also remember that helmets break in, so don't get one that fits prefect now cause it will loosen as you wear it. And don't loan your helmet out to anyone, because it breaks in to your head shape. If you loan it to somebody with a different shaped head or a larger head, your helmet will never fit you the same again. I know from experience :'(
 

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Happened at the track. I friend of mine crashed in practice and slid on his head a little. AFM tech wouldn't let him race using his crashed helmet so I loaned him mine. He was a 7 1/2 and I'm a 7 1/4. Came time for my race I put the helmet on and it didn't fit anymore. So here I am racing around Sears Point trying to tighten up my helmet cause it's moving around on my head. Never again have I loaned my helmet out.  :mad: 
 
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