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Hawk ST-1198 Transition 2 in 1 Flat Black Modular Helmet

by Hawk Helmets
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Item Description

Hawk ST-1198 Transition 2 in 1 Flat Black Modular Helmet

The Hawk ST-1198 Transition Modular Helmet gives you the best of both open-face and full-face styles. Go from full face to open face in seconds with the easy-to-actuate button; push the modular face all the way back for a more aerodynamic design. Another awesome feature is the internal tinted sun visor; deploys with ease even with gloves on and keeps you safe when riding in open face position! This helmet is constructed from composite thermoplastic material, advanced lightweight design, full front to back ventilation system, moisture-wicking helmet liner, removable cheek pads and meets strict DOT regulations.

Item Details

  • Composite thermoplastic shell material
  • Flat matte black finish
  • Sleek and lightweight design for a full face modular helmet
  • Front easy-to-actuate button; easily flips to turn from full-face to open-face positions
  • Push modular face all the way back for a more aerodynamic design
  • Dual visor design; clear Polycarbonate face visor
  • Interior retractable drop-down smoke tint sun-visor (ergonomic drop-down button located on left side of helmet, easily deploys with gloves on)
  • Front to back flow-through ventilation system
  • Moisture-wicking helmet liner and removable cheek pads: Breathable, quick drying, lightweight and soft
  • Impact absorbent liner
  • Padded chin strap with D-ring closure and strap keeper
  • Average helmet weight 3.5 lbs; weights will vary upon size
  • DOT Approved

Manufacturers Part Number


Size Chart

Hawk Helmets

Sizing Chart




20 7/8 - 21 1/4

53 - 54


21 1/2 - 22

54.6 - 55.9


22 1/4 - 22 7/8

56.5 - 58.1


23 - 23 1/2

58.4 - 59.7


24 - 24 1/2

61 - 62.2


25 - 25 1/2

63.5 - 64.8

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(Item: #ST-1198-Flat-Black)
List Price: $179.95
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Don't know your size? Sizing Chart
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 5/5 Stars (54 Customer Reviews)
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Customer Reviews

8 out of 10 people found the following review helpful:
August 24, 2012
Rick D. from STATELINE, NV
Helmet arrived timely. I followed the suggestions here for sizing and got one size larger, but had to exchange for the proper size. My head measure is 23.25" (23 1/4" to 23 1/2" 59/60cm... I typically do 7 3/8 to 7 1/2 hat size. This helmet chart says I should fit a large... and I do. This is the second helmet I have purchased sized a little different than spec'ed due to reviewers comments. Both times I had to exchange for the charted size, so I think I will follow the charts from now on. In my opinion, the deal is, helmet sizes are likely properly specified, however, they may fit snug or tight when you first get them due to the design and newness. A helmet *should* fit snug (almost tight) when you first get it - its going to break in and loosen up over time, and you do not want it moving around on your head, especially at high speeds. I have been riding about 40 years, and have bought a number of helmets, but this is my first time not purchasing in person at the store. Like I said, I think I will follow the charts from now on. PS: if you have a wide jaw the helmet will (seem to) fit even tighter, but it should fit perfectly in time as it breaks in to your particular head, so do not be discouraged by that. I love the design of this helmet. For a not-top-of-the-line helmet they did a pretty darn good job with it, and at a great price (and thank you LeatherUp!). Unfortunately I have not had opportunity to put it through its paces, so that review will have to wait. One thing I am curious to find out is if the vents function as expected... When you ride, a vacuum is formed behind your head, so I wonder how rear vents actually perform. The one design feature I find lacking is that the inner sun shade visor is made of some cheap plastic, not polycarbonate, so it does not provide any UV protection. Also, the view is a little distorted looking thru it, which I find super annoying, and unacceptable. Certainly would not tolerate that in a pro-grade helmet. To mention, I have not found *any* helmet with an inner visor that is advertised as being made of polycarbonate. (I searched high and low before deciding to go ahead and purchasing this one. And I was willing to pay more money, btw.) Keep in mind that the clear shield is Polycarbonate, so that does have proper UV protection. What I did was order some UV film to apply to the inner shield so I can use it safely with the outer shield open/up if I want (though I cannot imagine not wearing sunglasses anyway - I always have). Don't yet know if that will create more visual issues - not had time to play with that yet. The inner shield also 1) does not seem to come down quite far enough, though you can *pull* it down a little more following initial deployment. 2) But then you have a gap at the top of that inner shield ...that may introduce airflow. All in all I don't think you will find another helmet with these features competing in (or close to) this price range. Hence, in spite of my nits so far, I give it 5 stars. Lastly, one thing I complained to LeatherUp about was their packaging. They responded telling me they "forwarded this issue to the warehouse manager". The issue is lack of packaging *padding* of any kind (like paper, air baggies, peanuts)... in three shipments with them there never has been any, and the arriving (banged up at times) boxes have everything rattling around in there - big time. In one I had a pair of sunglasses tossed in with other large boxes in the main box. The glasses were in no container of any kind, not even a plastic bag, just jossling about with the other items haphazardly banging against them during transit. The items were not packed tightly, and had lots of room to move, and potentially crush the glasses... ...not to mention *how much* movement potential was in there. In one carton, an boxed helmet (having no inner padding itself) could travel at least 8 inches within the main carton. Imagine if that was dropped, suddenly travelling 8 inches to the other side, against concrete or a sharp hard edge... There would be no way of knowing what that "smack" might have done to the helmet if it was not visibly cracked. I have not had this problem with several of the other rider's vendors I buy from - I was a bit surprised to say the least. I will order from LeatherUp again - they have a great reputation, and they did respond to my complaint right away. But who knows what they will actually do about this at the warehouse. IF I see lack of proper protection for package contents again, I will never buy anything delicate like glasses or helmets from LeatherUp.
6 out of 7 people found the following review helpful:
November 17, 2011
Ronald F. from Pleasantville, Somewhere
I used the tape and measured 22 1/2 or so inches. I normally wear a Large half Harley Helmet with leather curtain, so I ordered this helmet in Large good thing I did as it fits small.his helmet cuts down noise, wind burble, the inner shield is dark enough for me. Side view is excellent better than with sun glasses or goggles on. Well made good price . I highly recommend it.
5 out of 6 people found the following review helpful:
March 03, 2012
Albert L. from FALLSTON, MD
Great helmet for the money. The triple flip back option is great. Gets the helmet totally out of the way. Nice that the inside cushions come out to wash also. Not really crazy about the flip down sun visor. If you wear glasses things are a little distorted.
5 out of 5 people found the following review helpful:
November 14, 2011
Mark W. from Brewer, ME
Wow! Tight fit. Had to return it. If not for the size issue it would be five stars. I typically wear a size large, but I actually had a difficult time getting this one off of my head. Very solid construction though.
0 out of 0 people found the following review helpful:
March 26, 2014
jim r. from HESPERIA, CA
this is my first fully enclosed helmet and like it, the fitting schedual was great help.
0 out of 1 people found the following review helpful:
February 14, 2014
Guillermo C. from San Juan, PR
Es muy bueno y llego rapido. Lo unico malo es que la mica transparente no se porque se mancha o le sale algo que no es de muy buena calidad, por lo demas es buena compra por su precio.
1 out of 2 people found the following review helpful:
January 22, 2014
trevor s. from DENTON, TX
Overall, a great buy for the price, but sometimes you get what you pay for in the small things. The shield had some kind of funky film on it that would make it fog up really bad, not a big deal, except when I went to unscrew the face shield hinges on the sides of the helmet, the plastic screw cap broke right off. Doesn't affect the safety or general use of the helmet, but frustrating no less. Also, the chin strap is really tight and almost impossible to operate with gloves on. The shaded visor also doesn't come down far enough. Overall good buy, but it's got plenty of room for improvement.
2 out of 2 people found the following review helpful:
December 30, 2013
William M. from PAWTUCKET, RI
Just as described. The flip all the way back feature is nice, but makes it heavy in the back of your head. fits great, easy to open and flip down the shade and I love the flat black look. the vents are great. I used it in a snow storm on my ATV with the visor opened to the first click cause it is not really made for cold weather and started to fog up in the closed position, plus I wasn't going fast to get the air moving through the helmet. I am very happy with this helmet. I looked at a lot of different modular helmets and am happy with my decision. THANKS LEATHER UP !!!
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