u cant exactly compare sizes between brands... hell even between models of the same brand. ex... i wear a M in Arai Quantum2, but a S in Arai RX-7, and an XS in the KBC wateva POS. my HJC dirt helmet is a M i believe.
if u dont want to spend 500$, get a Scorpion EXO-400 for 99.95$ from www.sportbiketrackgear.com.... but go try it on somewhere first. a buddy of mind had one n i liked it, and there r a few other helmet/gear threads that recommend these helmets as well.
Naked 93' F2...... RIP -- 04/12/07
04' 600RR Black - currently stuck between track and street usage
- Brembo Master, Sato's, & Ohlins out back