Found this webbikeworld link whilst looking for a new helmet. From the helmets I've had/tried on it seems quite accurate. It may help others choosing potential helmets as well.
- Bell Vortex, Med (Slightly Narrow) - pressure on my temples
- Shoei X-11, Med (Slightly Narrow) - pressure on the sides of my head
- Shoei XR-1000, Med (Medium Round) - perfect fit
- Shoei RF-1100, Med (Neutral) - good fit
- AGV Stealth, Med (Neutral) - ok fit
From this I think I have a Neutral to Round-ish head and can forget about a Shark RSI, RSX, Arai Vector, Shoei X-11 etc.
http://www.webbikeworld.com/motorcyc...met-shapes.htm
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