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  • 365 Day ReturnsRefund or exchange
  • Award WinningMCN retailer of the year
  • 15+ Years OnlineTried, tested, trusted
  • Click & CollectFrom a shop near you
  • Finance Available0% on orders over £300
  • Free UK DeliveryMainland ex H'lands (over £25)

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!

15+ Years Online

We've been serving the motorcycle community for more than 15 years now and in that time we've grown to be the largest online retailer of motorcycle clothing & accessories in the UK.

Click & Collect

If you can't be around to receive your delivery during the day, just use our click & collect option. We offer delivery to a shop local to you using the DPD Pickup network. Most pick up points are open outside of normal working hours and will keep your package so you can collect at a time to suit you.

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!

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).

Alpinestars Nucleon KR-2I Back Insert - Black

Best Seller
in Body Armour

CE approved Level 2 back insert for Alpinestars jackets and suits

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Our price

$40.33
Was $42.45

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

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

Top quality

Good product and fits Alpinestar Drystar jacket like a glove.

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Alpinestars Nucleon KR-2I Back Insert - Black
July 18, 2020

Very comfortable

Great product as always from Alpinestar. It fits perfectly into my Alpinestar Drystar jacket and moulds perfectly to my back.

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Alpinestars Nucleon KR-2I Back Insert - Black
July 16, 2020

brilliant

Fits perfectly, (after measureing the size of pocket in the jacket) and comfortable

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

Good

Great item

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Alpinestars Nucleon KR-2I Back Insert - Black
July 14, 2020

Fits well

Fits well into the jacket, and is quite flexible so the jacket retains in comfort

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Alpinestars Nucleon KR-2I Back Insert - Black
July 14, 2020

comfortable, excellent product

Good quality, even ventilation works, I am very happy with this purchase. For this price protection and comfort, i think hart too beet this product.

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

Light and Unnoticeable

Hope to never need it but equipped my Gunner V2 jacket and couldn't tell it's there. Peace of mind. Light and great fit. What's not to like! Moulds as well.

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Alpinestars Nucleon KR-2I Back Insert - Black
July 10, 2020

Comfortable

It seemed a bit bulky when I first put it in the jacket but once I had put the jacket on and done a few miles I couldn't tell it was there!

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Alpinestars Nucleon KR-2I Back Insert - Black
July 8, 2020

Great

Fits perfectly, is comfortable in the jacket and not heavy

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Alpinestars Nucleon KR-2I Back Insert - Black
July 1, 2020

back protector

it fits into the jacket well. some protection is better than no protection. seems strong and pliable so feels comfortable. not been on a long ride with it yet but so far happy with the purchase.

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Description

Alpinestars Nucleon KR-2I Back Insert - Black

OptionMaximum heightMaximum width
Small38.5cm22.5cm
Medium42.0cm24.5cm
Large44.5cm26.5cm


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
Manufacturer

About
Alpinestars

Alpinestars, a truly world class brand of motorcycle apparel. Founded in the early 1960s by Sante Mazzarolo, Alpinestars has grown to be a world leading manufacturer of professional racing products such as leather jackets, jeans, boots and 1 piece suits. Whilst their leathers are worn by some of the biggest names in bike racing, they also specialise in high performance textile jackets, jeans and gloves. From F1 to Karting, the World Rally Championship to NASCAR, Alpinestars work with the very best drivers and riders to bring design innovations to all aspects of professional motor-sport.

See all Alpinestars products
Questions and Answers

Questions and Answers

  • 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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