Armour Tire Insert, No Flat Bike Tire Liner, Puncture Proof Bicycle Tube Protector, Stops Flats from Thorns and Goatheads Compatible with E-Bikes, Mountain Bikes, and More

When I bought my new e-bike I had a flat tire almost once a week in the rear end once I put this product in those troubles are now in the past you can still get a flat tire with this I have but living in a very busy city with lots of nails screws glass on the sides of the road I got to admit these things really hold up and are well worth the money it did not change the traction the flat resistance is much better I have pulled nails out of my tire it actually bent a finishing nail and stopped it from going into my tube .

This insert has performed very well in the month I’ve had it. In the 6 months I’ve had my bike I’ve had at least 7 flats and most were from little pieces of metal from the street cleaners bristles and small glass shards. All would barely break through the tire but with the weight on the back tire they’d cause a flat. Always the back; insert angry face!!The second day it was in I pulled a staple that went straight into the tire out and the day after that a 3/4” finishing nail that went in at a slight angle. Neither punctured the tube and what I would’ve spent on replacement tubes has already covered a decent portion of the cost of this. I can still find glass shards and fine metal pieces but I’ve stopped even looking after seeing it take the nail and not go flat.I’ve seen reviews about this not having instructions and that’s wrong. They’re literally embossed on the side of the insert. It’s a few simple steps; deflate tube, clean insert, put insert into tire, tire on bike, re-inflate. But honestly if you need more that that you probably shouldn’t be working on your own bike imho. The only thing that wasn’t stated was that you may have to trim this if your size falls within a range like mine 3-4” insert for a 3” tire, but that’s kinda common sense and if you held the insert against your tire without trimming you’d see it’s way over sized. For this I put the whole insert into the tire, traced where it touched the edge of the tire and then cut 1/8” inside that line to give the tire bead space to seat in the rim. Like magic the amount I cut off was very close to 1”Lastly I’d like to point out something about sizing. The 20x3” tube I first put on which is my bikes size was too big. I felt this as I put it on. There’s just too much rubber when this insert takes up 1/3 of the space in the tire. I did my best to stretch it out and have it fit smoothly in the tire but there seemed to always be a spot it bunched. Plus I couldn’t really pump more than 20psi into the tire despite the bike calling for a min of 24. I should’ve trusted my instincts but recall reading another review saying someone was a clown for saying you need to size the tube down. Well last week I got a flat, was still able to ride to a safe place to change as the insert doesn’t put your rim on the road and the flat was caused by a small pinch in the tube. Not even against the rim just a tiny fold in the center of the tube where it sat in the insert. I got the next partial size tube smaller; 2.75-3.3” and it fits much better and took the correct psi.

Like others said, you gotta muscle these in..my biggest hangup was holding the liner back from blocking the valve stem hole while simultaneously shoving valve stem thru the hole. 45 second install is laughable, more like 45 minutes. I also used Flat Out in the innertubes. More to follow on performance.

these things are a MUST if you're riding anywhere than a sterilized environment. I was getting flats once per week. my last tube lasted for a whole year- even then, the tube gave out because the liners just wore out.

Upon reading many positive reviews I decided to make the investment to purchase these for my fat tire ebike. The instructions they supplied were worthless, but I did find some good YouTube tutorials that helped to ease the installation.Oddly enough one of the videos I stumbled across was a scathing review of how poorly these things hold up and perform as advertised.And just a couple weeks in I had my first flat. And my second, and my third and so on.What irritates me most is how they deceitfully advertise these as being able to withstand some many punctures and how beefy they show that “brand new” cross sectional area, which disappears in just a few months. The install date of these were in May, and here it is September and they have compressed to about 1/5 of what they started at. Which also makes the tube downsizing a joke.As of writing this review today I am taking these out and going with a traditional tire liner.