SPORTSBIKESHOP
  • Free UK DeliveryMainland ex H'lands (over £25)
  • Award WinningMCN retailer of the year
  • 365 Day ReturnsRefund or exchange
  • 15+ Years OnlineTried, tested, trusted
  • 80,000+ Products£10m stock holding
  • Next-day Delivery7 Days a Week

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).

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!

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.

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.

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.

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.

Alpinestars Nucleon KR-2I Back Insert - Black

Alpinestars Nucleon KR-2I Back Insert - Black

Customer Product Reviews

5 Stars from 103 reviews

Alpinestars
Price From $45.33 $50.39
Showing 1 - 20 of 103
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.

Alpinestars Nucleon KR-2I Back Insert - Black
January 25, 2019

Great quality

Moulds very well, soft on your back, not too bulky for the Alpinestars jacket I have, I have the largest size fitted easily.

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

Buy one.

Bought this to use with the Alpinestars Andes jacket. Perfect fix and very easy to install. Light, flexible and comfortable. Would never think of riding without it.

Alpinestars Nucleon KR-2I Back Insert - Black
January 3, 2019

Good for Dainese jacket!

More malleable than the hard plastic Dainese one and thus more comfortable in street style jacket.

Alpinestars Nucleon KR-2I Back Insert - Black
December 12, 2018

Confidence inspiring.

A very good fit in my Alpinestars jacket, it feels substantial but also is flexible enough not to be noticed whilst being worn, good to know it is there.

Alpinestars Nucleon KR-2I Back Insert - Black
November 26, 2018

Secure Fit

Seems like a quality product and gives a good senses of security. Fitted into the Alpinestars Drystar jacket easily. Feels comfortable and doesn't restrict movement

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.

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.

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.

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? :-)

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

Feels good

Fits well in my Alpinestars jacket.

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 ...

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.

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.