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Louis Garneau - P-09 Helmet

Louis Garneau P-09 Helmet

Changing the size selection, or changing the selected color after selecting a size, may change the associated price

Item #LGN006P



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Tech Specs

Shell Material:
Impact Foam:
EPS foam
Speed Vent
Fit Adjustment:
Spiderlock Pro II
Claimed Weight:
12.3oz (350g)
Recommended Use:
Manufacturer Warranty:
1 year


The Louis Garneau P-09 time trial helmet takes aerodynamics very, very seriously. The front part of the helmet is designed to have as little surface area as possible, and the dimpled surface disturbs the air just enough to increase the flow over the helmet.

The tail, which is supported internally, moves air efficiently over your shoulders. Louis Garneau also built a port into the P-09 that allows air to enter at the front, into a channel that exits just behind the ears to release any forward pressure. The vent also works with evacuation channels to improve airflow and provide cooling ventilation.

The lens system flips up and out of the way to ease entry and exit. It can be removed with just one hand. Garneau’s Spiderlock Pro II keeps the helmet in place and includes a polymer neck support the can be adjusted on the fly with the retention dial. Finally, the length and position of the straps can be adjusted with the Steplock divider, which utilizes a locking cam design.

  • Minimal frontal area
  • Dimpled surface
  • Aerodynamic tail
  • Pressure release port
  • Removable lens system
  • Spiderlock Pro II retention system
  • Steplock divider


  • Fit: True to size

best helmet for the price and this helmet fit better then last helmet i got. very light, easy to use

Awesome, FAST helmet; Sizing gap

  • Familiarity: I've used it several times

Helmet, although a few years old in design, is still one of the few helmets that tests FAST on 80% of the people; Helmets are a gamble otherwise as far as aerodymanics since it is so personal.

I used it so far, including in 2 races, and it is great! You forget it is on, which is what you want. I do not use the visor, it is also known that it does not test any slower without it.

Only problem, if you have a really small head like me (about 54.5 cm) there is a sizing gap: the small is way too small.. I doubt a child older than 9 yrs old can put his head in it; And the medium size (which fits fine for me in the 'course' helmet of the same brand) is too lose: the ratchet in the smallest position does not go far enough to provide a secure fit. I had to pad the back with a thickness of foam and add a few cushions in the lid to provide correct fit.


Nice lid

  • Familiarity: I've used it several times
  • Fit: Runs small

As a fifteen-year veteran Masters time-trialist, I now fuss over every little nuance trying to compensate for inevitable age-related losses! I had been wearing a Rudy Wingspan for the past several years and decided it was time for an upgrade. I tried a friend's Bell Javelin, which is a very nice, high-quality helmet, but for my head-down, David Millar-type body position I felt it was not optimal. When I was in a perfect position with chin up and back flat, it felt great. However, once I got fatigued or lazy and dropped my head, I could feel and hear the tail blowing around, which then just messed with my head even more!

Hence, I decided that one of the shorter tailed brands would be more appropriate. Furthermore, it seems that recent research has concluded that on average, such designs are more efficient in the real world, as most riders don't or can't maintain that perfect

Louis Garneau

S - XL
Hat Size 6 1/2 - 7 7 - 7 3/8 7 3/8 - 7 3/4 7 3/4 - 8
Head Circumference

20.5 - 22in

(52 - 56cm)

22 - 23.25in

(56 - 59cm)

23.25 - 24.5in

(59 - 62cm)

24.5 - 25.75in

(62 - 65cm)

S / M - M / L
 S / MM / L
Hat Size 6 1/2 - 7 1/8 7 - 7 5/8
Head Circumference

20.5 - 22.4in

(52 - 57cm)

22 - 24in

(55 - 61cm)

Hat Size 6 3/4 - 7 5/8 6 1/2 - 7 1/8
Head Circumference

20.25 - 24in

(54 - 61cm)

20.5 - 22.4in

(52 - 57cm)

Head Circumference:
Measure around your head where your hat would fit comfortably.