Please be assured that we are continuing to ship and deliver as normal.

  • Free UK DeliveryMainland ex H'lands (over £25)
  • 365 Day ReturnsRefund or exchange
  • Award WinningMCN retailer of the year
  • Free Returns*Mainland UK over £25
  • 60,000+ Reviewsfrom bikers like you
  • Finance Available0% on orders over £300

Free UK Delivery

It's really simple, if you spend over £25 with us, delivery is free of charge to any mainland UK address (excluding Islands & Highlands).

365 Day Returns

We simply don't believe in making the sale and moving on, we want to make sure our customers are happy with their purchase. That's why we now offer a full 365 day returns period. Simply relax, take your time and make sure it's right! All we ask is that you try the items within your own home and return with the tags intact.

Award Winning

There's a reason why our competitors spend so much time watching what we do, we believe in customer service levels beyond the norm and we're always looking for ways to improve. In late 2013 we were recognised for this by the bike industry's No.1 publication, Motorcycle News. As retailer of the year, we feel it's our duty to constantly better our offering and if you have any ideas, we'd love to hear from you!

Free Returns*

We now offer free returns on any UK Mainland order (excluding Highlands) over £25. Most importantly, returning an item to us is super simple. Just click here or on the 'create a return' link located at the bottom of every page, and create your return in under 1 minute.

60,000+ Reviews

Whilst we know a bit about bikes and bike kit, the best road testers out there are our customers, real bikers, just like you. If you're looking for advice on what to buy, you'll find over 60,000 independent product reviews which we've posted, unedited, for all to see. Whether it's a question about sizing, quality or something else, our customer reviews are quite simply, the best place to start.

Finance Available

Why wait? We now provide some of the best finance packages around to help spread the cost and get you on the road. We now offer finance on most orders from as little as £280 with 0% packages starting at only £300. The online application process is super simple too and takes around only 5 minutes to complete! The best part is, there's no paperwork to print and in most cases you'll have a decision in under 10 minutes. Just select finance as a payment method and take it from there!

Alpinestars Nucleon KR-2I Back Insert - Black

Alpinestars Nucleon KR-2I Back Insert - Black

Customer Product Reviews

5 Stars from 143 reviews

Alpinestars
Our price $34.94 $41.11
Showing 1 - 20 of 143
Alpinestars Nucleon KR-2I Back Insert - Black
April 30, 2020

Lovely to wear!

A great bit of kit that you don't notice when wearing the jacket. Fits into the appropriate pocket in the jacket no trouble. Brilliant value as well.

Alpinestars Nucleon KR-2I Back Insert - Black
April 15, 2020

Great product!

Product functions perfectly, very comfortable in jacket pouch and it moulds to your body very quickly and easily whilst riding! Definitely recommend!

Alpinestars Nucleon KR-2I Back Insert - Black
March 30, 2020

Just what I needed

I needed a back protector for an Alpinestars jacket I bought last year - it's like a wind shell type jacket with a hood. The small fits perfectly into the jackets mesh holder, and moulds to your back so not uncomfortable, in fact hardly notice it's there. Amazing service as usual from SBS

Alpinestars Nucleon KR-2I Back Insert - Black
March 22, 2020

Essential

Good value and an essential piece of protection for any Alpinestars jacket. Fits in the pocket and is almost unnoticed especially once worn for a short while

Alpinestars Nucleon KR-2I Back Insert - Black
March 13, 2020

Great extra protection

Excellent quality back protector. The material softens up with bodyheat and is very comfortable. I added mine to an Alpinestars Hoodie for some extra protection.

Alpinestars Nucleon KR-2I Back Insert - Black
March 9, 2020

Extra confidence than stock

I've moved from an RST jacket with an 'aero' hump that had a back protector in it which offered full back protection. Switching to an Astars jacket I also wanted the back protection to not feel exposed, however the back protector sits much higher up leaving a portion of the lower back exposed. I don't think it would be much of an issue in a crash however I do feel more exposed than on my old jacket. For full protection a dedicated back protector is needed.

Alpinestars Nucleon KR-2I Back Insert - Black
February 28, 2020

Back protection without the hump.

Great bit of kit. Fits perfect in Alpine Stars. Protects your back, nuff said. Why you hesitating, just get it. Don't want to regret not getting it do you!

Alpinestars Nucleon KR-2I Back Insert - Black
February 27, 2020

Light and Comfortable

Fits well in my Alpinestars V2 jacket and is barely noticeable. high quality from Alpinestars.

Alpinestars Nucleon KR-2I Back Insert - Black
February 13, 2020

Great fitting protector

Strong bit of kit. Good fit for my Merlin jacket. Great deal and delivery from Sportsbikeshop

Alpinestars Nucleon KR-2I Back Insert - Black
February 4, 2020

Really good

Really nice back protector,you don't even know it's there

Alpinestars Nucleon KR-2I Back Insert - Black
January 29, 2020

Buy the best

You know a product is great when you don't notice it. Typical high quality with the assurance that it will protect you as much as possible. Worth every penny.

Alpinestars Nucleon KR-2I Back Insert - Black
January 24, 2020

Perfect

Great bit of kit i have it in all 3 of my stars jackets and wouldn't go without the extra protection

Alpinestars Nucleon KR-2I Back Insert - Black
January 21, 2020

Hope I never have to test it!

Very light back protector providing a certain assurance. Good value compared with virtually the same one that you wear as a small back back under a jacket.

Alpinestars Nucleon KR-2I Back Insert - Black
January 20, 2020

Does the job

Really discrete. Barely notice it in my jacket.

Alpinestars Nucleon KR-2I Back Insert - Black
January 15, 2020

Don't Know Its There

Wearing this in an A-Stars textile jacket more for reassurance than anything. Fits well and comfortable to wear, Hope I never need to 'test' it!

Alpinestars Nucleon KR-2I Back Insert - Black
December 18, 2019

Wouldn't go without!

Excellent product, hopefully never have to test it but it fits the Alpinestars jackets well and provides security and comfort.

Alpinestars Nucleon KR-2I Back Insert - Black
December 16, 2019

Does the job well

Seems very well made and fitted perfectly into the back protector pocket on my jacket

Alpinestars Nucleon KR-2I Back Insert - Black
December 10, 2019

Good Stuff

Very comfortable. I don't feel it at all while I'm riding. Great pice of gear from alpinestars.

Alpinestars Nucleon KR-2I Back Insert - Black
December 2, 2019

Great back protector

I bought this for ARMA AZAI 2 summer jacket as I was looking for a light, comfortable back protector. I was surprised how light it was, flexible and really comfortable as after reading the good reviews on it, it was a must buy. It fitted my ARMA Jacket perfect as the medium for a perfect fit and you hardly notice its there but I feel better knowing I have in my jacket. Value for money and I would definitely highly recommend it to anyone.

Alpinestars Nucleon KR-2I Back Insert - Black
November 28, 2019

Light, Comfortable, Great fit

Perfect fit for my Alpinestars Andes Jacket. Medium bought for Large Jacket. Light and flexible - bought a 2nd one for the other half :)

PLEASE NOTE: The views and opinions expressed in the above reviews are solely those of the author and are not necessarily representative of the views of SPORTSBIKESHOP LTD.