Originally Posted by
ArgoMan
All very good replies. I'm wondering what the real-world difference is between aero helmets. I saw the Bell Z20 and got interested because I use a Bell now and it fits wonderfully. I have never thought about it while riding. Great ventilation. 5-star VT rating. But will the Evade III at $300 offer that much more in aero quality over the $120 Bell Z20, to justify the price diff? These are the questions that keep me staring out the window late at night.
Unless you can find some aero test data for both helmets then you will never know. But moving from a standard road helmet to an aero focused helmet like the Bell Z20 should give you a reasonable gain and I doubt spending more would really make a big difference.