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Product Details

Alpinestars Nucleon KR-CiR Chest Protector

The Nucleon KR-CiR is a high performance, lightweight track and race chest protector certified to CE level 2 and prEN 1621-3:2013. It is a perfect combination with the KR-R back protector for maximum protection. Designed to simply sit inside the front of  your race suit with no pockets, straps, snaps or VELCRO® brand closures required. 

Sizing Info:

Height (in)  Protector Size
56.75 - 68 XS-SM
68 - 76.5 MD-XL

Product Style RevZilla Item # MFR. Product # Availability
Product Style XS-SM RevZilla Item #1012242 MFR. Product #6702015-10-XSS AvailabilityIn Stock: Ships within 24 hours
Product Style MD-XL RevZilla Item #1012243 MFR. Product #6702015-10-MXL AvailabilityIn Stock: Ships within 24 hours

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Reviews & Questions

4.9 / 5.0
9 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
8
1
0
0
0
Bang For The Buck
4.9 / 5
Protection & Durability
4.8 / 5
Features
4.4 / 5
Comfort
4.7 / 5
Style
4.2 / 5
Air Flow
4.3 / 5
Fit
Small
True
Large
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
5 / 5
Comfort
5 / 5
Style
5 / 5
Fit
Small
True
Large
Air Flow
5 / 5
Great addition for summer
I purchased the MD-XL size protector and it fits inside a 50EU/40US Dainese SuperSpeed jacket chest pocket with a little room to spare (but not so much that it wants to fall out). This thing is very malleable and contours to your body very well. The huge air holes allow for TONS of airflow. Without the protector, my jackets perforation wasn't very impressive, since it's a snug fit and the air tends to just flow over the perforation. Adding the chest protector pushes the jacket away from my body just enough to create small pockets for air to enter into and circulate through the jacket, increasing the airflow substantially. Highly recommend this - especially since it's cheaper than the Dainese option.
July 15, 2015
Ride:
2008 KTM 990 Super Duke R
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
4 / 5
Comfort
5 / 5
Style
5 / 5
Air Flow
5 / 5
A good protector for a retro fit
I have an old motogp grid jacket that has no chest protection, or protector pocket. I used 1" wide velcro, and some shoe goo to attach the protector. The jacket velcro is just 2 small strips on the wind fly behind the zipper, and I added 2 strips to the protector. Holds it fine and have never had to remove it.

The gear itself is flexible and light - I never give it a thought.

It 's a nice upgrade at a reasonable price.
August 18, 2015
Ride:
2013 Ducati Hyperstrada
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
5 / 5
Comfort
5 / 5
Fit
Small
True
Large
Air Flow
5 / 5
Super Slim
I got a new suit and it was snug with the Forcefield Sub4 back protector, so I was a little worried that I couldn't get a chest protector in. This was noted as the most slim that I could find, so I took a shot.

It's fabulous. Rock solid when you pull it out of the package, but it's soft and moldable within 5 minutes of being on under the suit. Assuming it performs as advertised and I couldn't be happier with it.

I'm a 39" chest, it suits me just right. I'd say if you're over 42", it might not give the type of coverage you're imagining across the sternum-- though it'll definitely still cover that key part. At 6' tall, I feel as if it's the perfect height-- probably good for 5'8" up to 6'2".
July 14, 2017
Purchased
8 months ago
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
3 / 5
Comfort
5 / 5
Style
3 / 5
Fit
Small
True
Large
Air Flow
3 / 5
Great upgrade for any suit or jacket
I purchased this to upgrade my Dainese chest protector. They are both light weight and level 2, but this Alpinestars chest protector is extremely comfortable because it molds to the shape of your chest. Like others have written, I had to touch my chest while riding to make sure it was still there! The price is also less than Dainese. In my opinion, the only negative I would give this chest protector is that it is very small. I ordered the largest size. Because it molds to your body, a larger protector would just wrap around your shape and protect more area like your ribs. I ordered a Dainese chest protector according to the size chart and it was still too large, the sides poked out and made it uncomfortable. I would definitely recommend this product!
May 25, 2017
Purchased
9 months ago
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
5 / 5
Comfort
5 / 5
Style
5 / 5
Air Flow
5 / 5
Good fit, lightweight and comfortable.
Fits good inside my suit which is tight. Feels comfortable and not intrusive.
September 29, 2015
Purchased
over 2 years ago
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
5 / 5
Comfort
5 / 5
Style
5 / 5
Fit
Small
True
Large
Air Flow
5 / 5
JR44 REVIEW
This is an excellent product. I had used it before, comfortable and very safe. I recommend everyone
May 20, 2017
Purchased
9 months ago
Bang For The Buck
5 / 5
Protection & Durability
4 / 5
Features
4 / 5
Comfort
4 / 5
Style
4 / 5
Air Flow
3 / 5
Chest Protector
Solid, well-made and lightweight. I was looking for a smaller chest protector to add to my racing leathers and this is perfect. Very happy. Hopefully I'll never find out how it works but it's an extra piece that is good to have.
May 24, 2016
Bang For The Buck
5 / 5
Protection & Durability
5 / 5
Features
5 / 5
Comfort
5 / 5
Style
5 / 5
Fit
Small
True
Large
Air Flow
4 / 5
Just buy it already
Works flawlessly and gives you peace of mind while hopefully never needing to test it out. It's thick but molds to your shape well and it is light.
May 30, 2017
Purchased
9 months ago
Bang For The Buck
4 / 5
Protection & Durability
4 / 5
Features
4 / 5
Comfort
3 / 5
Style
2 / 5
Fit
Small
True
Large
Air Flow
4 / 5
Simple and easy to use
I replaced my 10+ yr old Bohns chest armor as it was quite bulky. The Nucleon armor is significantly lighter, and should allow a fair bit more airflow which should help on those scorching days. I also like that it is very thin and easy to conceal.

The only negative characteristics that I am not thrilled about is that it is a lot stiffer than other molecular armour I have used such as d30. Also the backing is extremely slick which means that it will ride down in your jacket/suit. I wear it inside a compression shirt which should assist in keeping it in place. The armour is also significantly smaller in coverage, so definitely err on the side of larger than smaller.

Overall a very good value
November 30, 2015
Purchased
over 2 years ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 4 questions Browse 4 questions and 9 answers
Why did you choose this?
RevZilla Store
Only use Astar. Chest protector for race.
RODRIGO R on Aug 26, 2017
No worries about insert pockets. Can use them underneath any leather or riding jacket
Rakesh S on Jul 14, 2017
Only use Astar. Chest protector for race.
RODRIGO R on Aug 26, 2017
Value and protection
Richard K on Aug 7, 2017
No worries about insert pockets. Can use them underneath any leather or riding jacket
Rakesh S on Jul 14, 2017
Fits easily and securely under my Laguna Seca race suit
Brian B on Mar 29, 2017
Want a chest protector for the track. This seems to be one of the few CE L2 certified ones.
Supposed to be light, flexible and well vented. My racing suit is tight enough, so this should stay in place.
Let's see if all of this holds true when it gets here. Ship if FAAAAAAST, 'Zilla!
multispoke on Nov 29, 2015
Had a tumble got some cracked ribs also bruising to the chest and back. Anything to make track and race days safer...
Matty555 on Jul 1, 2015
Because I don't want to have mushy innards in case of a violent one off.
Rasheed H on Feb 24, 2015
Value and protection
Richard K on Aug 7, 2017
Fits easily and securely under my Laguna Seca race suit
Brian B on Mar 29, 2017
What Alpinestars jackets are compatible with this chest protector?
Matthew H on Feb 27, 2015
BEST ANSWER: None. This is made for race suits. You want something sold with a harness.
Does this come with some sort of strap or insert to keep it on the chest and body?
Dan A on Apr 3, 2015
BEST ANSWER: Nope, just slide it in when zipping up. If your suit fits right it won't have a lot of room to move. It is also a fairly flexible material.
What chest protection is recommended with the Tech air race suite size 54?
lee m on Dec 22, 2017
9 Customer Reviews
9 5/5
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3 Questions & 2 Answers
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