Amazon.com: Customer reviews: Giro Synthe Adult Road Cycling Helmet

Top positive review

Really happy with this helmet

Reviewed in the United States on February 23, 2016

Really happy with this helmet. Bought it for the weight and looks (as in it's a fairly normal looking bike helmet, not hardcore aero or race looking). Overall, the helmet is light enough that it's possible to forget you're wearing it and surprising very comfortable considering the minimal padding. Straps are also well positioned and comfortable.

Seems to run a bit bigger than other helmets. My previous helmets, Specialized and Bontrager, I was in the bottom of the large range. According to the Giro's measurements, I'm the upper end of the medium. Actually ordered both the medium and the large and kept the medium. While it's nice to try them on, make sure you measure first. If I had walked into a bike shop and just tried on a large, I might have kept it think it was fine. though the medium was far more comfortable for me.

4 people found this helpful

Top critical review

Critical reviews›

Cycling4fun

Helmet shelf life.

Reviewed in the United States on November 28, 2021

Just to inform others. Unfortunately the helmet was outdated. 2016 shelf life. I was told by my bike club that even though it is new and never used the shelf life can deteriorate the product.

134 total ratings, 103 with reviews

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From the United States

K. Rose

Really happy with this helmet

Reviewed in the United States on February 23, 2016

Verified Purchase

4 people found this helpful

Helpful

A.M. Bright

Well Made, Good Fit

Reviewed in the United States on September 18, 2018

Verified Purchase

I bought a Gyro Prolight helmet several years ago. I was happy with the fit and function of that helmet- so when I decided to replace it, I wanted to stick to the same size and brand.
The Synthe fits even better. This is because of the nicer retention system. It adjusts with a simple twist of the dial at the back of the helmet. I can now get a perfect fit- even as my hair grows between visits to the barber :-)
The helmet offers adequate ventilation during my rides in Florida's summer weather.
Regarding the aerodynamic properties- although I'm an aero engineer, I'll have to trust other reviewer's lab testing. I think it looks cool though!
After much thought, I decided to go with the ($50 cheaper) non-MIPS version. Others may reasonably come to a different decision though.

One person found this helpful

Helpful

sunest

The best helmet I've had.

Reviewed in the United States on April 20, 2020

Verified Purchase

Previously I've had a Bontraeger, Bell, and department store cheap Giro helmets. The Bontraeger wasn't inexpensive by any means, but nowhere near as nice.
The Roc Loc Air system makes it feel as though you're wearing a comfortable hat rather than a helmet. It is pretty, pretty light. The air gets right in making it much cooler than I expected.
I'd definitely buy again.

One person found this helpful

Helpful

DaveR

Very nice helmet but not for hot weather

Reviewed in the United States on June 13, 2015

Size: Large (59-63 cm)Color: Matte Black (2018)Verified Purchase

This is a great helmet with one, potentially BIG, cavaet.

Before I bought this I did my research and all the reviews I could find were glowing. There was not a single Synthe I could find locally so I ordered one from amazon putting blind faith in all the reviews.

First the good: this helmet is well designed, light, compact and comfortable. The quality that underlies the price point is apparent. I'm also convinced that with this helmet I can maintain a set speed (solo) with notably fewer watts than my old Giro Atmos. So the performance claims seem warranted.

Now the bad: all the reviews said this helmet had great ventilation. What I think they meant was great ventilation...for an aero-helemt. At least for tis time of year (and living in the american south) this helmet is HOT. Road temps here can easily top 100 my mid morning (saw 106 last weekend) and the Synthe simply cannot cope. I've noticed consistent that about 30 minutes into a ride sweat, instead of evaporating as it would with my Atmos, collects inside the helmet before eventually dripping down the chin strap and onto my top tube.

The redux: right now, in hot sunny weather I feel that the significant elevation in heart rate the Synthe induces (ie, me attempting to cope with the helmet's inability to cool) really offsets any watts I might save--and in the context of a group, I'd say the heat retention of the Synthe could be out right liability performance wise. I'm going back to my old Atmos (falling apart as it is) until fall gets here.

The verdict: It's a helmet worth considering for short events (crits) or in cooler weather where on-road temps never get much above 85F.

19 people found this helpful

Helpful

Wilson

Helmets save lives!

Reviewed in the United States on October 29, 2015

Verified Purchase

I'm only writing this review because I'm fortunate enough to be able to write one. This helmet most likely saved my life. In the short time that I had the Synthe, it fit well, stayed glued to my head even without the chin strap buckled thanks to its Roc Loc system, and vented very well compared to my old Giro Rift. The straps took a while to adjust to sit flush against my head but once they were set I never noticed them.

Last weekend on a family-paced bike tour (read: slow), I fell on the left side of my head hard enough to crack my helmet. To make matters worse, another rider rode over the other side of my head. I blacked out and was eventually shipped to the ER. Aside from a minor fracture to my cheekbone (which is not the helmet's fault), cuts and scrapes to my face and left knee, my head is intact. My helmet stayed on my head without shifting. It most likely saved my life. PSA: if you ride, WEAR A HELMET, a well-fitting, properly adjusted one! I'll be buying a new Synthe with MIPS.

39 people found this helpful

Helpful

Cycling4fun

Helmet shelf life.

Reviewed in the United States on November 28, 2021

Verified Purchase

Just to inform others. Unfortunately the helmet was outdated. 2016 shelf life. I was told by my bike club that even though it is new and never used the shelf life can deteriorate the product.

Helpful

P2M

Head protection extraordinaire

Reviewed in the United States on October 12, 2023

Verified Purchase

I wrecked my road bike with one of these on and hit my head on the pavement. I'm still walking and talking because I had one of these on. Of course I bought another one. Not a piece of equipment to go cheap on.

Helpful

Dave Smyth

These are great helmets and this is my second one

Reviewed in the United States on September 19, 2018

Verified Purchase

These are great helmets and this is my second one. The last one I had was a medium and the fit was perfect so I ordered the same size this time, but it’s very tight and gives me a headache after an hour. I honestly think it’s a size small badged incorrectly.

Helpful

Adam

Decent, but sacrifices fit and quality for aerodynamics and weight

Reviewed in the United States on February 11, 2016

Verified Purchase

Part of the reason this helmet is more aerodynamic because the profile of the helmet was decreased. In other words it's awkwardly oval and slightly tighter than other giro helmets. If you want to wear a cap or balaclava under this and you aren't sure if it will fit you might want to look somewhere else. Build quality is okay, more exposed foam around the edges to get beaten up than I have come to expect with helmets like the giro air attack or kask line for instance. If you can get this helmet on sale it is a good helmet that breathes well thanks to the roc lock forehead design. If you aren't set on this helmet probably look somewhere else, it's a lot of hype.

One person found this helpful

Helpful

Nick S.

Great-looking and great protection

Reviewed in the United States on December 28, 2019

Verified Purchase

I rode with this helmet for a little over a year before I had a nasty crash and hit my head. It certainly did its job and definitely saved me from head damage. The retention system is pretty good. I've tried a bunch of helmet brands over the years and this one falls in the upper-third in terms of comfort. This helmet seems to look pretty good on men and women of all sizes and shapes. I would try to find this helmet on sale. I definitely would not pay $200+ for it.

One person found this helpful

Helpful

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Giro Synthe Adult Road Cycling Helmet - Medium (55-59 cm), Matte Black (2018)

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Giro Synthe Adult Road Cycling Helmet - Medium (55-59 cm), Matte Black (2018)

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Giro Synthe Adult Road Cycling Helmet - Medium (55-59 cm), Matte Black...

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