COVID-19 Update: We will continue to deliver online orders as normal. Our retail stores are closed until further notice.

  • Click & CollectFrom a shop near you
  • Finance Available0% on orders over £300
  • 365 Day ReturnsRefund or exchange
  • 60,000+ Reviewsfrom bikers like you
  • Award WinningMCN retailer of the year
  • Free Returns*Mainland UK over £25

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!

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.

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.

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.

Alpinestars Nucleon KR-2I Back Insert - Black

Alpinestars Nucleon KR-2I Back Insert - Black

Customer Product Reviews

5 Stars from 173 reviews

Alpinestars
Our price £31.60 Ex Tax £37.49
Showing 1 - 20 of 173
Alpinestars Nucleon KR-2I Back Insert - Black
September 17, 2020

Excellent

Fits really well and is very comfortable. You can't really feel it when you wear it!

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

Perfect Fit

Bought for my Andes Jacket and it fits perfectly into the pocket and is light and comfortable to wear. Offers a good level of protection at a reasonable price.

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

Decent back protector

Good quality

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

Top quality

Good product and fits Alpinestar Drystar jacket like a glove.

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.

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

brilliant

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

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

Good

Great item

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

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.

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.

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!

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

Great

Fits perfectly, is comfortable in the jacket and not heavy

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.

Alpinestars Nucleon KR-2I Back Insert - Black
June 25, 2020

Back protector

Very good quality and service

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

Great price and comfy

Feels soft and flexible.Easy to install and a great price. Not worn on the bike yet but hardly noticeable walking around with the jacket on.

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

Comfortable, protective back armour.

Another great product from Alpine stars. I feel much safer with added back protection, it doesn't compromise comfort of my Alpinestar jacket and it slips easily and securely into the provided pockets of my jacket. I would recommend this product.

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

So comfortable

I purchased this back protector to fit the Alpinestars Crazy Eight Leather Jacket. It was easy to fit, and moulds nicely to my back. Another great purchase from SportsBikeShop!

Alpinestars Nucleon KR-2I Back Insert - Black
June 7, 2020

Perfect light weight

So I purchased for my new light weight breathable jacket, perfect combo. Just wanted to add extra protection. Very flexibly comfortable and light. I purchased a medium for my 2xl Alpinestar viper v2 jacket and fits perfect. Definitely recommend.

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

back protection

Bought to fit in an alpine jacket fits perfectly in pocket nice and comfo on too

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

Perfect fit

A-Star always deliver quality

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.