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Alpinestars
Bionic Knee Guard
$69.95 
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Item Availability status
In Stock - Usually leaves our warehouse same business day
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Product Description
  • Articulated protector follows the movement of the knee joint
  • Impact-resistant, ventilated thermoplastic shell with aluminum-reinforced knee cup for superior energy absorption
  • Ergonomically designed to fit knee and the side of the bike with asymmetrical form
  • Removable, impact-resistant bio-foam padding with a comfortable Lycra liner
  • Adjustable hook-and-loop straps are strategically placed to prevent skin abrasions
  • Hinges are durable billet aluminum
  • Snap assembly for ease of cleaning
  • Sold as a pair
Click swatch to view color options
Customer Reviews
Average Rating -  Based on 10 Review(s)
Fit   3.8
Features   3.9

Finish   3.9
Cost Benefit   3.7

Durability   4.0
Overall   3.9
Latest Reviews
Fit   5.0
Finish   5.0
Durability   5.0
Features   5.0
Cost Benefit   5.0
Overall   5.0
Tim Rogers Houston,  TX Perfect! The fit is so good I keep them on in the house! The hinged knee joint is cool, but makes a clicking when you walk sometimes, which aint a problem. I have high engineer boots and these strap on right above them with two strong velcro straps. I ride a cruiser street only and yes- these do feel bionic! People notice the metal first as it catches the light, then they see how the hinge works and impressed they are! I recomend these for every activity indoors and out. I'm 5'5" but these should fit 4'tall to 7'tall, very versatile unless your thigh is 2' wide.
Fit   3.0
Finish   3.0
Durability   4.0
Features   4.0
Cost Benefit   3.0
Overall   3.4
Ewan Ferguson Tracy,  CA How to keep them up? I tried the Adult large (I'm 5'8, 150lbs) and they wouldn't stay in position. No matter how tight I put the velcro, after a few steps, the rode down my leg. However the finish and quality seemed pretty good although I never rode in them. Good knee coverage front and sides.
Fit   3.0
Finish   4.0
Durability   4.0
Features   3.0
Cost Benefit   2.0
Overall   3.2
Ken Brooksville,  FL Bionic Knee Guard A very well made product, but it is too large to fit under the pants, and when used on the outside, it scratches the finish on the bike. I would not recommend it.
Fit   5.0
Finish   5.0
Durability   5.0
Features   5.0
Cost Benefit   5.0
Overall   5.0
Werner Phoenix,  Northwest Alpine Bionic Knee Guard I am very glad that I have purchased this knee guard. It gave me the protection I needed when the front wheel of my dirt bike washed out on gravel on a fast corner. I did not have the time to even put my foot down. I went down sideways still sitting on the bike, and the front and side protection of this knee guard was excellent! I use these knee guards over my pants, and they worked very, very well. Not even the pants got a scratch. I was going about 25-30 mph, and my left knee hit the dirt on i
Fit   4.0
Finish   4.0
Durability   4.0
Features   4.0
Cost Benefit   4.0
Overall   4.0
Gary Edmond,  NY Knee Guards I like them a lot. I wore them on the spring Trans American Trail ride, over 1500 miles. They are comfortable and easy to wear.
Fit   4.0
Finish   4.0
Durability   4.0
Features   4.0
Cost Benefit   4.0
Overall   4.0
Bob Santa Rosa,  Northwest Knee protection These things are comfortable! I can’t wait to go down to test them out. They are the best fitting knee guard in this price range. Try them, you’ll like them too!
Fit   3.0
Finish   3.0
Durability   3.0
Features   3.0
Cost Benefit   3.0
Overall   3.0
joe sinclair sacramento,  New Brunsw knee pads I don't know how anyone can wear these without a knee sock, they'll rub your legs raw, however putting them on over your pants seems to be the best way to keep them from moving around. they do offer the ultimate in protection, however upon my first fall on some rocky terrain the bottom portion broke into two pieces but my knee stayed intact. So, do they do there job? Yes. Are they durable? No.
Fit   2.0
Finish   2.0
Durability   2.0
Features   2.0
Cost Benefit   2.0
Overall   2.0
Shawn Hillsboro,  AZ Alpinestar Knee Guards They bind when extending your knee, are very uncomfortable without a knee sock, and with the straps they do not stay in place at all. When standing up and grabing the bike with your knees they shift to the outside. They only sell one size which is *huge* with no adjustment.
Fit   5.0
Finish   5.0
Durability   5.0
Features   5.0
Cost Benefit   5.0
Overall   5.0
Karen Tehachapi,  CA Bionic Knee Guards I have only one word for these...AWESOME. I purchased a pair for my nephew who was born with no kneecaps. The range of motion is flawless. There is complete coverage no matter what position the knee is in. They are extremely comfortable, and they stay put...no sliding down. Now my whole family wants them! Worth every penny!!!
Fit   4.0
Finish   4.0
Durability   4.0
Features   4.0
Cost Benefit   4.0
Overall   4.0
Heidi Jacoby Rigby,  FL Bionic Knee Guards These Kness Guards are very comfortable and versatile. The fit well under riding pants and are not bulky despite that they look like they are. They move awesome with your leg/knee as though you didn't even have them on. Be careful though when ordering sizes; I wear a medium and the size chart only offered a size Med/Lrg. So I purchased this hoping it would fit. They are a little loose, but I compensate for this by wear a knee sock. I not sure if they carry a size medium or not, but it was
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