I've done a couple of 70.3 races and I've entered my first full distance next year. This year's been fantastic for me in terms of training but with work and life I just haven't been able to schedule in many races. I did just two this year, mechanical ended my first, and I came second overall in a small local Olympic with just over 100 competitors. Wasn't exactly a stacked field but gave me plenty of confidence and a bike course record was a definite boost.

Anyway its getting to that time of year where I start looking at free speed options for next year and potential Christmas presents. I can't really afford to fork out on a new wheelset (I have a Fuji Norcom with stock Oval 50mm wheels, although I will be getting a rear disk cover before next season)

Anyway I currently use a Lazer Tardiz helmet, which I love because of the magnetic straps but it does fail the eyeball aero test pretty miserably. I've liked the look of a Met Drone for ages (ex swimmer, fairly wide shoulders) but the newer breed of aero helmets just LOOK so much faster (and they just look cooler...)

Question is how much am I likely to be losing? I'm assuming it's actually a pretty small amount and will most likely upgrade regardless, but I'd love to have a rough guide. Can't seem to find any wind tunnel info on the Tardiz!