Alpinestars Nucleon KR-2I Back Insert - Black

CE approved Level 2 back insert for Alpinestars jackets and suits

RRP £59.99


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Verified Customer Reviews for Alpinestars Nucleon KR-2I Back Insert

223 reviews
Great back protector
28 February 2024 by Anonymous
Lightweight, flexible, really nice fit. I would recommend.
Back protector
18 February 2024 by James T
Perfect fit for jacket..nice bit of kit.. usual Sportsbikeshop service...
Feels sturdy
11 February 2024 by Harry F
It fits perfectly into my alpine stars jacket. It doesn't feel noticeable while wearing. It feels solid.
Just the job
17 January 2024 by Christopher
Nice product. Would be good if included with the jacket but never mind. Fits nicely and can hardly be felt once worn
Back Protector
12 January 2024 by Anonymous
Great fit and the sizing was spot on. As always fast and hassle free delivery from sportsbikeshop.
Alpinestars back protector
12 December 2023 by Alison H
Fitted into jacket snuggly hopefully mould into shape of back after a couple of ride outs. Really top quality piece of kit.
Back protection
11 December 2023 by Robin W
Excellent bit of kit as always fantastic service from sporstbikeshop
Back protector
09 December 2023 by Bill S
Bought the medium and it fits perfectly in the Andes V3 medium jacket.
Excellent service as usual from SBS
Alpinestars Nucleon KR-2I Back Insert
08 December 2023 by David H
I bought the Alpinestars Nucleon KR-2I Back Insert for my Alpinestars Andes V3 Drystar Textile Jacket as extra protection, it just slots into the compartment in the back of the jacket, a simple installation and fits great. Many thanks again, sportsbikeshop for another great product.
Compliments Alpinestars Andes jacket perfectly
05 December 2023 by Bill
I bought this to slot into my Alpinestars V3 Andes jacket. Now I don't feel guilty for not wearing my full-size Knox back plate if I'm out for a more relaxed ride. A good price too, as always from Sportsbikeshop.
I really wish that these were standard in the jackets, why do the manufacturers value shoulders and elbows over backbones?
Comfortable Protection
28 November 2023 by Andrew O
Fits the jacket easily (Alpinestars Solano) and feels comfortable - you hardly notice its there.
Proper back protector
24 November 2023 by M D
lightweight but more substantial than the one that came with my ktm jacket. fitted well, don't know you have it on when riding.
Back insert kr2
22 November 2023 by Iain S
Fits great and feels really well made.
Back protector
09 October 2023 by Jim M
Light flexible, fits well and easily into alpinestars gravity jacket.
Unobtrusive, and gives peace of mind.
Don't know its there
19 September 2023 by Ian F
Got this for my new alpinestar Ketchum jacket.
Fits a treat and you don't even know its there as its light and moulds to your back.
Really comfortable and confidence building for the extra protection it brings.
Superb quality and fit for the right jacket
12 September 2023 by Josh H
Replaced a very heavy budget protector with this on in my alpinestars drystar jacket. Fits perfectly and is very flexible. You forget it is there once you are wearing it.
07 September 2023 by Chris B
Perfect fit for the pouch of my Alpinestars jacket. Made from a material that moulds to your back while still giving you great levels of protection.
Nothing but the best again from Alpinestars
04 September 2023 by Craig G
This back protector is so light you don't even know you're wearing it, fits perfectly in the ready shaped pocket within my jacket. Can not fault it. Knowing you have that protection without knowing it's there is a big statement and a credit to Alpinestars in producing something lightweight but capable of protecting you.

Alpinestars Nucleon KR-2I Back Insert - Black

OptionMaximum heightMaximum width

The latest in back protection inserts from Alpinestars is the Nucleon KR-2i soft back protector insert. Suitable for all Alpinestars jackets or suits that feature a back protector pocket. It's design conforms to the latest back protector standards with it's Level 2 CE-certification (EN1621-:2014). The 'Nucleon' back protector's design has been ergonomically profiled for an optimised fit, whilst the lightweight design and flexibility with incorporated airflow system helps to keep the wearer both cool and comfortable. This highly protective back protector is quick and convenient to insert and offers the perfect fit for the ultimate in safety performance.

Back protector compatibility chart

  • Level 2 CE approved
  • Lightweight, Flexible Design
  • PU Injected Impact Foam
  • Ergonomically Designed Profile
  • Perforated For Breathability & Comfort
  • Channel Ventilation System For Optimised Airflow
Questions and Answers

Questions and Answers

  • What size protector is needed for an Alpinestars Andes 3 jacket in large?

    March 8, 2023

    Alpinestars recommends a size large insert for your jacket.

  • I have an Alpinestars Newman Overshirt - L. What size back protector should I order?

    February 20, 2023

    According to the compatibility chart you will need the Large protector in this instance.

  • I have a 3XL Alpinestars T-Jaws Jacket which size back protector will be required? Thanks

    February 6, 2023

    According to the compatibility chart you will need the Large protector in this instance.

  • What size do i need 2 fit 4x drystar jacket

    March 16, 2020

    You will require size Large.

  • I have just received an Alpinestar Ares goretex jacket 2xl what back proctor will fit this jacket? Many thanks.

    December 13, 2018

    A 2XL jacket requires the large Nucleon back protector.

  • Hi I have purchased an Alpinestar Jaws Leather Jacket off yourselves recently- size 42 chest. I'm 6ft 3" and slim. Jacket is snug but good fit. Which size would you recommend re. the back protector?

    September 6, 2018

    We would recommend the medium back protector.

  • Hi, looking at purchasing the Alpinestar GP plus R v2 size 46 U.K. Q1 is this the best back protector? Q2 what size for the 46?

    April 25, 2018

    This is the Level 2 CE approved back insert that Alpinestars recommend. If you were to purchase an Alpinestars Jacket in a UK size 46, you require the Large insert.

  • I have an Alpinestars Motegi Leather Jacket size EU56. Which size do I need as the compatibility chart isnt clear if they are using the Euro or product size?

    August 14, 2017

    You will need a size large for your jacket

  • I have an Atem one Piece suit 3 years old.It has no pocket for a back protector just the press stud fixings. How is the Nucleon held in place as there are no reciprocal stud fittings shown on the photos of the protector ?

    January 26, 2017

    This product is only suitable for all Alpinestars jackets or suits that feature a back protector pocket.

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