SPORTSBIKESHOP
  • 365 Day ReturnsRefund or exchange
  • 10+ Years OnlineTried, tested, trusted
  • Next-day Delivery7 Days a Week
  • Free Delivery*Mainland UK over £25
  • Award WinningMCN retailer of the year
  • 80,000+ Products£10m stock holding

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.

10+ Years Online

We've been serving the motorcycle community for more than 10 years now and in that time we've grown to be the largest online retailer of motorcycle clothing & accessories in the UK.

Next-day Delivery

It's simple, we're now shipping 7 days a week for delivery 7 days a week so, whichever day you choose, you can have your order delivered the very next day!

Free 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).

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!

80,000+ Products

Our stockholding is now in excess of £10 million with over 80,000 items in stock, ready for next day delivery. We also believe in offering our customers the very best choice, with more than 190 brands on offer and a range to suit every budget.

Alpinestars Nucleon KR-2I Back Insert - Black

Alpinestars Nucleon KR-2I Back Insert - Black

Customer Product Reviews

5 Stars from 90 reviews

Alpinestars
Price From £37.99 £39.99
Showing 1 - 20 of 90
Alpinestars Nucleon KR-2I Back Insert - Black
August 15, 2018

Safety first

Lightweight, breathable, comfy and reassuring it's there should the worse happen. Fitted straight into my Alpinestars Brera jacket. A must have. Adding to that great price and speedy delivery, both things Sportsbikeshop provide time and time again. 5 stars for both product and supplier.

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Alpinestars Nucleon KR-2I Back Insert - Black
July 29, 2018

Great

I didn't want to spend the money on the Dainese one, I got this one and it fit in my jacket. 1 week later I had a crash and the back protector sure did help with keeping me safe.

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Alpinestars Nucleon KR-2I Back Insert - Black
July 15, 2018

Top quality back protector!

Thin & light with enough flexibility to mould nicely to your back when riding. Purchased the chest protectors too which all fit perfectly in my Alpinestars Jaws leather jacket. Great product.

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Alpinestars Nucleon KR-2I Back Insert - Black
May 4, 2018

I've been a naughty boy

Rumour has it that the Alpinestars Nucleon KR2i back protector insert also fits nicely into the jackets of their arch rivals Dainese! Have purchased one to try in my Dainese Razon jacket and can confirm the rumours are true. It fits great! The KR2i is lightweight, very flexible, amazingly thin (for a Level 2 protector) and very comfortable to wear. Its also excellent value for money. So whether you are an Alpinestars or Dainese wearer this back protector cones highly recommended. I wonder if Sportsbikeshop will print this? :-)

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Alpinestars Nucleon KR-2I Back Insert - Black
April 24, 2018

Feels good

Fits well in my Alpinestars jacket.

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Alpinestars Nucleon KR-2I Back Insert - Black
March 2, 2018

Hope I'll never need to test it

Fits well. Much better than the foam padding you get as standard on Astars stuff ...

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Alpinestars Nucleon KR-2I Back Insert - Black
February 16, 2018

Fast delivery of a quality product

Fast delivery as usual, the back protector is light and fits perfectly in my leathers. It's designed to contour to your back and is much more comfortable and less bulky than the (temporary) RST, I fitted.

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Alpinestars Nucleon KR-2I Back Insert - Black
January 22, 2018

Nice but should be cheaper

Nice piece of kit, comfortable to wear & fits nicely into my textile jacket but I don't see why it's not cheaper.

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Alpinestars Nucleon KR-2I Back Insert - Black
January 19, 2018

Very good product

Product came brand new exactly as described. Very good bit of kit, hopefully when the time comes it'll prove it's worth. Very fast shipping time and excellent communication from sender.

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Alpinestars Nucleon KR-2I Back Insert - Black
January 18, 2018

Good product, fast delivery

Fast delivery. Good protective product: fits neatly into back of my jacket. Not too bulky and I don't notice it's there too.

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Alpinestars Nucleon KR-2I Back Insert - Black
December 26, 2017

Very comfy

Excellent value, easy fit into the jacket, very comfy and well worth purchase. Pity it wasn't a standard fit but very happy, thank you.

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Alpinestars Nucleon KR-2I Back Insert - Black
November 10, 2017

Excellent

Fits nicely in jacket and doesn't feel like you have a board on your back!

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Alpinestars Nucleon KR-2I Back Insert - Black
October 10, 2017

Feels great

Fit nicely into both my Scorpion and Alpinestars jackets. It feels light and doesn't rub or press in anywhere. Haven't crashed yet, but I'm optimistic!

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Alpinestars Nucleon KR-2I Back Insert - Black
September 2, 2017

Brilliant product

Fits well, light, with enough flex to work with while not riding.

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Alpinestars Nucleon KR-2I Back Insert - Black
August 30, 2017

Good unobtrusive back protection

The Alpinestars Nucleon KR-2I Back Insert was very simple to fit into my Drystar textile jacket although at first it seemed a bit stiff, but once wearing the jacket it soon softens and moulds to your shape. After a short ride I didn't even notice wearing it. So very pleased with the extra protection it will provide if a ride doesn't go to plan. It was also delivered earlier than predicted.

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Alpinestars Nucleon KR-2I Back Insert - Black
August 7, 2017

Great light-weight back protector

I bought this to use with the Alpinestars Amok Drystar Textile Jacket, which it fits perfectly. Wanting something with good protection, whilst being light-weight, this product is barely noticeable whilst wearing and also with the holes gives great breathability without compromising the CE L2 protective ability.

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Alpinestars Nucleon KR-2I Back Insert - Black
July 26, 2017

Perfect all round back protection

Alpinestars have yet again produced another high quality product to help reduce the risk of serious injury in the event of an unfortunate accident. The back protector molds to your individual shape whilst worn. Wouldn't leave home without it! Essential kit...but fingers crossed I'll never need it!

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Alpinestars Nucleon KR-2I Back Insert - Black
July 24, 2017

Great product

Perfect fit for DXR Skybolt Leather Jacket (L). Great advice received by Sportsbikeshop Customer Service Team (Antoine). This Alpinestars Nucleon KR-2I Back insert fits like a glove into my DXR jacket. The material is thick but light and flexes enough to fit into the jacket. It adds great protection to my back and doesn't restrict my movements while riding and the perforations keep my back dry in warm weather. Its memory foam like composition feels very comfortable, I don't realise I've got it on. Great product!

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Alpinestars Nucleon KR-2I Back Insert - Black
July 20, 2017

Perfect for A-Star leather suit (with race hump)

Delivery: SBS as always, quick and well packed. Price : reasonably priced as per current market Quality: A-Star cannot be faulted. Feels like a solid piece of armour compared to the ordinary foam that it replaced in the A-Star Challenger suit trouser - Back section. this is a LEVEL 2 protector. Fit: Perfect fit as expected. They seem similar to D3O armor. If you squeeze its soft and if you punch it feels hard. Surely similar properties if I am not mistaken. It does mould to your body to an extent as claimed by some reviews, but that is a good thing. My suit has a race hump (medium size) and inserting this back protector doesn't change the fit and feel of the suit. The suit does get slightly snug but that could be also due to the fact I have also added chest inserts as well. Feel: Doesn't cause any discomfort. Feels as if it was already part of the suit. Also invokes confidence in the suit. Wore it during a very hot day and didn't seem to change the comfort of the suit compared to when there was only foam. It's perforated well so does breathe. Test: Hope will never have to. confident it will do the job. Recommendation: 5/5

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Alpinestars Nucleon KR-2I Back Insert - Black
July 18, 2017

Just the job

Fitted perfectly in my Alpinestars summer jacket. Was light and flexible. Hopefully will do it's duty in a time of need. Have bought a few things from Sportsbikeshop. Always good value and prompt.

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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.