SPORTSBIKESHOP
  • Finance Available0% on orders over £300
  • Next-day Delivery7 Days a Week
  • 200+ Top BrandsUK's largest range
  • 55,000+ Reviewsfrom bikers like you
  • Award WinningMCN retailer of the year
  • 15+ Years OnlineTried, tested, trusted

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!

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! Order by 7pm Monday-Friday, 5pm on Saturday or 3pm on Sunday.

200+ Top Brands

There simply isn't a better selection of biking brands anywhere in the UK and we're constantly updating every range to ensure you have the best choice available.

55,000+ 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 55,000 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!

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.

Alpinestars Nucleon KR-2I Back Insert - Black

Alpinestars Nucleon KR-2I Back Insert - Black

Customer Product Reviews

5 Stars from 115 reviews

Alpinestars
Price From $42.35 $49.83
Showing 1 - 20 of 115
Alpinestars Nucleon KR-2I Back Insert - Black
August 29, 2019

Great protection

Perfect fit for my alpinestar jacket. Lightweight and very flexible

Alpinestars Nucleon KR-2I Back Insert - Black
August 14, 2019

Good safety enhancement to jacket

Good level 2 back insert specific to Alpinestars jacket. It was for my wife's jacket which they don't supply with a back insert, but the pocket is there. Tried one from an old jacket but didn't fit. Glad the sportsbikeshop website gives details of which size you need depending on jacket size. Quality product, Wife says it is very comfy.

Alpinestars Nucleon KR-2I Back Insert - Black
August 12, 2019

Love it

I don't even notice it's there. Super light and flexible yet nice and thick. Worth the bit of extra money and a perfect fit for my A-star jacket too. Medium pad in a Euro 52/US 42 jacket

Alpinestars Nucleon KR-2I Back Insert - Black
August 6, 2019

Awesome bit of kit

Service from SBS is awesome great service and speed, this item turned up and it looks big and heavy but is not the case at all. I got this to go into my Alpinestars Valparaiso 2 Drystar Textile Jacket it fitted right in. The first ride was in 26C temp and my old back cover made me hot and have a wetback. This nothing with the front vents open on the jacket I can feel the wind go in and out thru the back protector. I now feel safe if the worse should happen as this item means business in saving me pain and some discomfort if the worse happens 5 star item

Alpinestars Nucleon KR-2I Back Insert - Black
August 1, 2019

Confidence when riding

Recently bought a GP Plus R V2 jacket and I am a 46 chest, so the large size fits perfect and that's what you will need. It feels great and makes me feel I have given myself a stronger chance to limit injury if the worse happens. Given the price of these jackets I would expect them to be included in the price. Great service from SBS again

Alpinestars Nucleon KR-2I Back Insert - Black
July 15, 2019

Certainly looks / feels the part

M fits my M textile jacket nicely and certainly looks / feels like it will do the job. Why doesn't this come with a jacket as standard I wonder / would pay the extra up front for it.

Alpinestars Nucleon KR-2I Back Insert - Black
July 15, 2019

Spot on

This back protector is a perfect fit my my alpinestars jacket and is lightweight and comfortable.

Alpinestars Nucleon KR-2I Back Insert - Black
July 12, 2019

Excellent service as usual

The way in which the sales system is set up at Sportsbike shop, the attitude of staff, the range of products, stockholding, delivery and communication is second to none! And no, I don't work for them. Once again, thank you.

Alpinestars Nucleon KR-2I Back Insert - Black
June 24, 2019

Solid fit in the jacket

Feels robust and comfortable. Fits nicely into the jacket with no loss of comfort. Top buy.

Alpinestars Nucleon KR-2I Back Insert - Black
June 11, 2019

Comfortable and Sturdy

Fitted it into an Alpinestars T-Missile Drystar jacket. Comfortable and feels very secure. Great bit of kit. Highly recommend.

Alpinestars Nucleon KR-2I Back Insert - Black
June 11, 2019

Upgrade your gear!

I hope it doesn't get tested, it feels good and fits perfectly on my Alpinestars Gunner jacket.

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

Essential item

Bought the back protector to go in my Alpinestars 3L jacket as the one supplied is little more than a thin piece of foam. The back protector fits the jacket perfectly (2xl jacket with the L protector). It makes you the jacket stiffer when you pick it up but once you put the jacket on you would never know it was on. Reassuring to have level 2 protection. Hope to never need to test it out.

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

Great Quality

Fitted this to a Leonis Drystar jacket. It is very pliable, moulds easily to your back and is comfortable to wear. Purchased a size Large, which fits my XL jacket perfectly. Recommended.

Alpinestars Nucleon KR-2I Back Insert - Black
May 11, 2019

Quality

My view is you can't skimp on safety features great quality and fit and feel, hope this helps

Alpinestars Nucleon KR-2I Back Insert - Black
May 7, 2019

Worth the money

Fits my alpinestars sektor tech jacket perfectly, with luck I'll never have to find out whether or not it provides the level of protection required however it's always better to have and not need than need and not have and at £35 it's priced far cheaper than I'd be willing to pay to avoid a spinal injury. Just buy it .

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

Solid piece of mind.

Light, well ventilated with the ability to mould to your back. Easy to install in my Alpinestars atem jacket. An essential purchase. Medium size for medium jacket. Cheapest price I found. Excellent delivery and communication.

Alpinestars Nucleon KR-2I Back Insert - Black
March 27, 2019

Lightweight flexible but sturdy

Bought this with an Alpinestar Leonis Drystar jacket. Very pleased, it's very light, comfy and flexible but reassuringly thick so I think it will offer good protection. You don't notice it when wearing jacket.

Alpinestars Nucleon KR-2I Back Insert - Black
March 19, 2019

Cracking value for money

Surprisingly good quality for the money. Fits perfectly into my Motegi jacket.

Alpinestars Nucleon KR-2I Back Insert - Black
February 13, 2019

Almost can't feel it

Although this is a rigid back projecter, you almost can't feel it once in the jacket. Looks like it will give a lot of protection to the back. All in all, a nice bit of kit

Alpinestars Nucleon KR-2I Back Insert - Black
February 4, 2019

Worth it

Great quality, really adds a feeling of safety to my alpinestars jacket which didn't have a back insert.

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.