New

Alpinestars RK-7 Plasma Knee Brace - Black Red - L 6500825-13-L

New from Alpinestars for the 2025 season. With a slim ergonomic design offering a high level of off-road performance and comfort during dynamic movement, the RK-7 PLASMA Knee Brace has been engineered to provide superior knee support.
  • £333.33 (Exc. VAT)
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Lightweight, breathable, comfortable, and protective. This knee brace features a free-floating Nucleon PLASMA knee protector encased in an innovative asymmetric fiber reinforced frame construction for enhanced levels of rigidity.

Key Features

  • This brace provides optimal structural integrity, rigidity and comfort, and thus reduces the risk of sustaining injuries to the medial and lateral collateral ligament, the anterior and posterior cruciate ligament, and the lateral and medial meniscus.
  • The replaceable knee cups are constructed with a polyurethane outer shell backed with a Nucleon PLASMA Knee protector for the optimum blend of impact protection, flexibility and scratch resistance.
  • The replaceable strategically positioned upper and lower patella extensions ensure maximum coverage regardless of the flexion or extension angles.
  • The extremely stable, slim-design four-point hinge system perfectly follows the articulation of the knee while the extension stops, which are available in a range from 0 to 30 degrees, assist in setting the brace to the desired maximum opening angle.
  • The stainless-steel bushings in the four-point hinge system have an anti-oxidation treatment.
  • Nucleon PLASMA is a viscoelastic material engineered from bio-based polymers and formed into a structure that is pliable in all directions while maintaining the ability to dissipate impact energies. Lightweight and highly ventilated, the knee protector offers strong impact force dispersion and absorption while ensuring maximum coverage in all riding positions.
Construction

  • The Nucleon PLASMA Knee protector is constructed from USDA certified bio-based eco-friendly and sustainable impact absorbing material.
  • Soft-touch thermoformed padding ensures the highest levels of rider comfort while keeping the knee brace securely in position. Replaceable as a spare part.
  • Soft-touch thermoformed condyle padding comes in different thicknesses for a customized fit. Replaceable as a spare part.
  • Nucleon PLASMA embedded into the shin padding for additional protection.
  • Equipped with padded X-straps backed with a non-slip material to ensure the knee brace remains securely in position while riding.
  • X-straps are profiled to avoid pinching the back of the knee when fully flexed.
  • High tensile strength buckles are robust while still being flexible for easy strapping and adaptivity.
  • Upper and lower buckles are easily locked into the closed position by a keyhole snapping system.
  • Easily exchangeable extension stops (0, 5, 10, 15, 20, 25 and 30 degrees). Replaceable (as spare parts).
Protection

  • The Ce-certified Level 1 RK-7 PLASMA Knee Brace provides optimal structural integrity, rigidity and comfort, and thus reduces the riders risk of sustaining injuries to the medial and lateral collateral ligament, the anterior and posterior cruciate ligament, and the lateral and medial meniscus.
  • Constructed with a polyurethane outer shell, the replaceable knee cups are backed with a Nucleon PLASMA protector for the optimum blend of impact protection, flexibility and scratch resistance.
  • According to European statutory law the CE mark is a conformity requirement for the marketing of this product. The following standards apply:
  • Knee Protector: EN 1621-1:2012 LEVEL 1

Manufacturer Part No. (MPN): 8059347445564
Barcode: 8059347445564
Age:Adult
Colour:Black/Red
Gender:Unisex
Model:RK7 Brace
Size:L
Type:Knee Brace
Contact us with any questions you have about this product

Consumer

Click & Collect Only

Select a collection point from our network of available dealers. You will be notified by the chosen dealer once your order is ready to collect, estimated time is 2-3 days (depending on national holidays and dealer opening hours).
Any returns will be handled by the collection point.

  • Free for orders over £100
  • £11.95 fee for orders below £100

 

Trade

Standard Delivery

Orders will be despatched as follows: To business addresses only; £9.95 (Exc VAT) delivery charge (subject to change depending on account level); Free delivery with net order values of £100 and over (Exc VAT) to the UK Mainland; Orders to N. Ireland/Eire/Isle of Man/Scilly Isles by arrangement; other destinations phone for details; Typical delivery times of 1-2 working days.

Where possible, the Company will endeavour to meet special delivery requirements subject to any additional cost being borne by the Purchaser

Unfortunately, we do not delivery to addresses outside of mainland UK without prior agreement. Without prior agreement you may place an order for Products from outside the UK, but this order must be for delivery to an address in mainland UK unless arranged otherwise prior to your order.

All third party deliveries will carry a charge, the minimum charge will be £9.95 (Exc. VAT).

Pallet Charges

Larger items may incur additional carriage charges, including but not limited to 4x4 and SUV tyres.
An overview of charges per pallet for each region is available to view here: https://www.google.com/maps/d/viewer?mid=11ydN7ZJNHKHf9Ygd0ih_L6-U1dMq31A


Read our full delivery policy here

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ALPINESTARS SIZE CHARTS

 

 


MENS SIZE CHART

Men's MX Boots

eg. Tech 10, Tech 8, Tech 7 Enduro

EU SIZE 38 39 40.5 42 43 44.5 45.5 47 48 49.5 51 52
US SIZE 5 6 7 8 9 10 11 12 13 14 15 16
JPN SIZE 24 25 25.5 26.5 27.5 29 29.5 30.5 31.5 32.5 33.5 34.5
SHOES INSIDE LENGTH (CM) 25.1 25.9 26.8 27.6 28.5 29.3 30.2 31.00 31.9 32.7 33.6 34.4
SHOES INSIDE LENGTH (INCHES) 9.88 10.19 10.55 10.86 11.22 11.53 11.88 12.20 12.55 12.87 13.22 13.54
COMFORT SIZE (CM) 24.3 25.1 26.0 26.8 27.7 28.5 29.4 30.2 31.1 31.9 32.8 33.6
COMFORT SIZE (INCHES 9.56 9.88 10.23 10.55 10.90 11.22 11.57 11.88 12.24 12.55 12.91 13.22

Compare the measurement (in cm) of the longest part of the foot using the table above.
Cross reference this value against the "SHOES INSIDE LENGTH".
Then, from this column, check whether the measured length of the foot is greater than the value of the corresponding "COMFORT SIZE".
If the measured length of your foot in the "SHOW INSIDE LENGTH" is less than the same columns "COMFORT SIZE", then you will have the correct shoe size to order.

A. SHOES INSIDE LENGTH
Example SIZE 9 (28.5cm / 11.22 inches)

B. COMFORT SIZE
Example SIZE 9 (27.7cm / 10.90 inches)

Alpinestars MX Boot Measuring Guide

 

Men's Touring Boots

eg. Belize

EU 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
US 4 5 6 8 9 10½ 11½ 12 12½ 13½ 14
JPN 22.5 23 24 25 25.5 26 26.5 27.5 28.5 29.5 30 30.5 33.5 34.5 33

 

Men's Gloves

eg. Full Bore

INTERNATIONAL SIZE XS S M L XL XXL 3XL (XXL)
MENS HAND CIRCUMFERENCE (INCHES) N/A 7½ - 8 8 - 8½ 8½ - 9 9 - 9½ 9½ - 10 10 - 11
MENS HAND CIRCUMFERENCE (CM) N/A 17.8 - 20.3 20.3 - 21.6 21.6 - 22.9 22.9 - 24.1 24.1 - 25.4 25.4 - 27.9

Measure hand circumference without thumb

 

Men's Protection Jackets

SIZE XS S M L XL 2XL (XXL)
CHEST (CM)  82 - 90 90 - 96 96 -101 101 - 108 108 - 112 112 - 118
WAIST TO SHOULDER (CM)  38 - 43 38 - 43 43 - 48 43 - 48 48 - 51 48 - 51
HEIGHT (CM) 157 - 166 166 - 173 173 - 178 178 - 185 185 - 190 190 - 195
CHEST (INCHES) 32½ - 35½ 35½ - 38 38 - 39⅓ 39⅓ - 42½ 42½ - 44 44 - 46½
WAIST TO SHOULDER (INCHES) 15" - 17" 15" - 17" 17" - 19" 17" - 19" 19" - 20" 19" - 20"
HEIGHT (FEET) 5'2" - 5'5" 5'5" - 5'8" 5'8" - 5'10" 5'8" - 5'10" 6'0" - 6'3" 6'0" - 6'3"

Chest - Measure around the fullest part, under the armpits, keeping the tape horizontal.
Waist - Measure around the natural waist line, inline with the navel, keeping the tape horizontal. 
Height - Stand against a wall, ask someone else to measure from the floor to the top of your head, keeping the tape vertical.

 

Men's Chest Protectors

SIZE XS / S M / L XL / 2XL (XXL)
CHEST (CM)  82 - 96 96 -108 108 - 118
WAIST TO SHOULDER (CM)  38 - 43 43 - 48 48 - 51
HEIGHT (CM) 157 - 173 173 - 185 185 - 198
CHEST (INCHES) 32½ - 38 38 - 42½ 42½ - 46½
WAIST TO SHOULDER (INCHES) 15" - 17" 17" - 19" 19" - 20"
HEIGHT (FEET) 5'2" - 5'8" 5'8" - 6'1" 6'1" - 6'3"

Chest - Measure around the fullest part, under the armpits, keeping the tape horizontal.
Waist - Measure around the natural waist line, inline with the navel, keeping the tape horizontal.
Height - Stand against a wall, ask someone else to measure from the floor to the top of your head, keeping the tape vertical.

 

Men's Elbow Protectors

SIZE S / M L / XL
UPPER ARM (CM) 23 -29 29 -35
LOWER ARM (CM) 20 - 28 28 -34
UPPER ARM (INCHES) 9 - 11½ 11½ - 13⅓
LOWER ARM (INCHES) 8 - 11 11 - 13½

Measure at the widest muscle circumference

 

Men's Knee Protectors

SIZE S / M L / XL
UPPER LEG (CM) 39 - 45 45 -50
LOWER LEG (CM) 32 - 38 38 - 43
UPPER LEG (INCHES) 15 - 17⅓ 17⅓ - 19¾
LOWER LEG (INCHES) 12 - 15 15 - 17

Upper leg circumference: Measure 10cm/4" above the centre of the kneecap
Lower leg circumference: Measure at the widest part of the calf

 

Bionic Knee Brace

SIZE S M L XL / 2XL (XXL)
WIDTH (CM) 10.6 - 11.4 11.4 -12.2 12.2 - 13 13 - 13.8
WIDTH (INCHES)  4¼ - 4½ 4 - 4¾ 4 - 5¼ 5¼ - 5½

Measure kneecap width at the centre

 

Men's Kidney Belts

SIZE XS / L XL / 4XL (XXXXL)
WAIST (CM) 70 - 94 94 - 116
WAIST (INCHES) 27½ - 37 37 - 45½

Waist - Measure around the natural waist line, inline with the navel, keeping the tape horizontal.

 

Men's Socks

2 Size Options (e.g. Knee Brace, MX Socks Long)

SOCK SIZE S / M L / XL
US SIZE 6 - 9

9.5 - 13.5

EU SIZE 38 - 42 42.5 - 47.5

 3 Size Options (e.g. MX Pro, MX Plus)

SOCK SIZE S M L
US SIZE 6 - 8 8.5 - 10.5 11 -13
EU SIZE 38 - 40.5 41 - 43.5 44 - 47

 4 Size Option

SOCK SIZE S M L XL
US SIZE 5 - 6.5 7 - 8.5 10 - 11.5 12 - 13.5
EU SIZE 37 - 38.5 39 - 41 43 - 45 45.5 - 47.5

 


WOMENS SIZE CHART

Women's Footwear

EU 37 38 39 41 42
US 6 7 8 9 10
JPN 23 24 25 26 26.5

 

Women's Gloves

eg. Stella Full Bore

INTERNATIONAL SIZE XS S M L XL 2XL (XXL) 3XL (XXL)
WOMENS HAND CIRCUMFERENCE (INCHES) 6½ - 7 7 - 7½ 7½ - 8 8 - 8½ 8½ - 9    
WOMENS HAND CIRCUMFERENCE (CM) 16.5 - 17.8 17.8 - 19 19 - 20.3 20.3 - 21.6 21.6 - 22.9    

 

Women's Protection Jackets

SIZE S M L
CHEST (CM) 86 - 90 90 - 94 94 -98
WAIST TO SHOULDER (CM) 38 - 43 38 - 43 43 - 48
HEIGHT (CM) 169 - 172 172 - 176 178 - 180
CHEST (INCHES) 33⅓ - 35½ 35½ - 37 37 - 38½
WAIST TO SHOULDER (INCHES) 15" - 17" 17" - 19" 17" - 19"
HEIGHT (FEET) 5'6" - 5'8" 5'8" - 5'9" 5'9" - 5'10"

Chest - Measure around the fullest part, under the armpits, keeping the tape horizontal.
Waist - Measure around the natural waist line, inline with the navel, keeping the tape horizontal.
Height - Stand against a wall, ask someone else to measure from the floor to the top of your head, keeping the tape vertical.

 


YOUTH SIZE CHART

Youth MX Boots

Euro 28 29 30.5 32 33 34 35.5 37 38 39 40.5 42
US 10J 11J 12J 13J 1 2 3 4 5 6 7 8
JPN 17.5 18.5 19.5 20 21 21.5 22.5 23 24 25 25.5 26.5

 

Youth Jackets - Body Armour

SIZE S / M L / XL
YEARS 6 - 8 9 - 12
CHEST (CM) 60 - 70 70 - 80
WAIST TO SHOULDER (CM) 30 - 35 35 - 40
HEIGHT (CM) 120 - 140 140 - 160
CHEST (INCHES) 23½ - 27½ 27½ - 31½
WAIST TO SHOULDER (INCHES) 11⅓ - 13⅓ 13⅓ - 15⅓
HEIGHT (FEET) 3'11" - 4'7" 4'7" - 5'3" 

Chest - Measure around the fullest part, under the armpits, keeping the tape horizontal.
Waist - Measure around the natural waist line, inline with the navel, keeping the tape horizontal. 
Height - Stand against a wall, ask someone else to measure from the floor to the top of your head, keeping the tape vertical. 

 

Youth Kidney Belts

SIZE S / M L / XL
YEARS 6 - 8 9 - 12
WAIST (CM) 60.5 - 70.5 70.5 - 80.5
WAIST (INCHES) 21½ - 24½ 24½ - 27½

Waist - Measure around the natural waist line, inline with the navel, keeping the tape horizontal.

 

Sizes provided as a reference guide only. Please check the manufacturers website for the latest size guides.

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