TannusArmour Tire Insert – Puncture-Proof Bike Tube Protector for Gravel, Fat, and E-Bikes – No Flat Liner Stops Thorns, Goatheads & More

If you're tired of fixing flat tires, get these inserts. I've only had one flat in 3000 miles! I was getting a flat every 200 miles or less without these inserts. The flat I did get was a 3"nail, so that's hard to avoid.They can be a bit difficult to install, but well worth the challenge.

These are awesome. Seriously I was getting a flat every week last summer and fall due to goatheads. My worst week was 3 flats last fall. Im also running with less tire pressure but getting a very nice firm riding feeling at 30lbs where I was running 40lbs previously. I have noticed a very small range decrease as im riding an ebike. Example in PAS 3 im currently getting 15 miles an hour, 42 miles distance in city. Before installing the tannus tire liner in same mode I was avering 15.4 mph with a range of 45-51 miles (city versus country roads). Great product and a serious inner tube and patch savior. With warmer whether I'm riding a bit more, currently 150 miles this month in 60°-70° temps. Winter riding i think I rode 24-30 miles a month, just too cold. Anyways i am so very happy I bought 2 of these liners for my ebike and recommend them for everyone.

So I have a 20 inch by 4 electric bike! In the course of 7 days I managed to pop two rear tires. Unfortunately they do not make the solid rubber tires in the 20x4. They make them in 20x2 but not 20x4 so I was forced to purchase this in hopes that it would work and I would not pop anymore rear tires! I'm not worried about the front most of the wait on an electric bicycle is in the rear because it's a rear wheel motor. Now I just installed this yesterday and I took my electric bike on a half a mile trial run and it seems to be working properly. Time will tell whether or not this works or if I will pop another one. I will update my review in a couple of weeks and let you know how it's holding up! Now I did have to downsize an inner tube by one size meaning I have a 20x4 but I needed to purchase a 20x3 tube in order to give this insert the proper Roman needed. As I said in a couple of weeks I will update my review.

Easy to install, added flatout to the inner tube and new huntsman tires. Hopefully creating a more puncture proof combination.

No flats since install. Note: Trimming may be required, but is awkward.

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.

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.

Very frustrating, expensive foam, is extremely difficult to install and makes my front wheel wobble.