Tannus Armour Tire Insert 20 x 3.0-4.0, Fat Tire Tube, No Flat Bike Tire Liner, Puncture Proof Tube Protector for E-Bikes and MTB

I have used this product before and am happy and have not had a flat thus far. First Bike had for a year and never had a problem. Second Bike just installed tannis liner so hope I get same results.

My ebike has 20x4 tire and I've had three Flats on the rear. A bit of research later an I picked up some Tannus Armour and some Slimed. I installed it on my rear tire in under an hour, not too hard if you follow the instructions, and so far so good after 3 weeks.

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.

Amazing — expensive but worth it !

Very Disappointed After Daily CommutingI installed Tannus Armour tire inserts in both the front and rear fat tires because I wanted dependable puncture protection for my daily commute. I ride approximately 13 miles round trip every day and had high hopes that these inserts would make my bike reliable enough for everyday transportation.Unfortunately, on September 16, 2026, a small metal shard punctured my tire almost directly through the center of the Tannus Armour insert. When I removed the tire, I found the metal shard still lodged in the insert. I also noticed that the insert had lost a noticeable amount of thickness along the center where the tire makes the most contact with the road.I understand that no product can prevent every possible flat, but I expected better protection and durability, especially from a product marketed as “Armour.” Since the puncture occurred near the thickest and most important protective area, it left me very disappointed and questioning how well these inserts hold up under regular daily use.It’s unfortunate because I genuinely wanted this product to work. My goal was to use my bike as a dependable everyday ride to work, and I purchased inserts for both tires specifically for that peace of mind. Based on my experience, the center section appears to compress and wear down over time, leaving it more vulnerable to sharp objects.