From my limited testing of that helmet you'll probably be faster with something else
how much time :01-1min /40k

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Brian Stover USAT LII
Accelerate3 Coaching
Insta

Any way to know which helmet would suit me best? Not really at wind tunnel level!

Had a Lazer Tardiz and while liked a couple of the features of it - the magnetic buckle, water port and the roller dial on top. But I hated the length of the visor and the amount of eye coverage it provided when the helmet was worn so the tail was touching my back and not sticking up in the air.

I replaced it with a LG P-09 and like the fit much better as it sits perfectly on my back. But it is warm due to lack of having much for air vents. I also have the specialized evade which has the same magnetic buckle as the Lazer and is great for hot conditions with all the vents.

I have no idea how much faster either would be and frankly unless you go to a tunnel or have them all available for a rollout test, you will never know. If you can't test, then Go with what fits your position best and then your comfort next.

Agree on the mag buckle, absolutely love that! Actually looking at the Lazer wasp in the hopes that it has the same buckle but can't see mention of it anywhere! Might just go with what I like the look of and make sure it has a visor!

If the availability of a visor is a big part of driving this issue:
1) Visors for the Tardiz are available.
2) Visors have only mixed success, apparently, in wind tunnel testing. Compare that to the visor definitely reducing cooling in a hot race.

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I don't see how anyone can go with any helmet but the Giro Aerohead unless they go to a tunnel track etc and can find a faster helmet. The reality is the Aerohead is testing really fast on nearly everyone. If you look at the shape and study it isn't rocket science why it is performing so well. It has a cool visor as well that mounts upside down. I wrote some detailed thoughts on the helmet here. It has been my aero helmet for nearly a year. P09 before that.

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IIRC that helmet tests faster 19/20 with the plug removed. That should help with ventilation as well

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Brian Stover USAT LII
Accelerate3 Coaching
Insta

I love mine. I have no issue with the Visor.

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