Flat Out Off Road Tire Sealant, Sportsman Formula, Prevents Flat Tires, Fix a Flat Tire, Seals Leaks, Contains Kevlar, 32 Ounce Bag, 4-Pack

This stuff really works! I got a flat from a nail on my 20x4 fat tire ebike that had FlatOut in it already. I pulled the nail, spun the tire and started pumping it up. It was holding air until I spun the tire again but forgot to disconnect my pump and broke the pump. I rode an hour on what little air I was able to fill with before having to walk to the closest fire station where they filled my tire. I was able to ride home a couple more miles after the fill.When I got home, the next day, the tire was flat again. I spun the tire again slowly to get the FlatOut moving in the tube, and added some air. I kept repeating this every 4-5 psi until I got the tire up to 20-22 psi. Tire held that air pressure for the next few days and I've since put over 40 miles on the bike and tire without issue and still holding air.I used 1/4 of the bag I got for each tire...1/2 bag for both tires.

I've got a big, fat tire electric bike that weighs about 80 pounds unloaded.I Started getting flat tires. Having to walk my bike home 5 miles with a flat is not fun.Fixing a big fat tire flat is a slow and time consuming process.Regular bike levers usually won't do the job. I have to use motorcycle tire spoon levers to fix a flat.Its not something I'd want to do on a hot summer day, or in the middle of a downpour, or with sleet and snow hitting me in the face, my hands freezing barely able to hold the tire levers. Changing a flat on a electric bike, the power cable connector has to be disconnected, zip ties holding the power cable have to be cut, or electrical tape holding the cable in place has to be cut.Doing all this in a rain storm could be a very electrifying experience in a bad way.I started looking for a better way, a better solution to prevent flat tires.After watching several YouTube videos about different solutions.I tried the Tannus Armour foam liner, right away I got a flat with that and I still had to walk five miles home with a flat tire. It made rolling my bike on a flat even more difficult.Once home, I had to cut the tire liner with a pair of scissors, just so I could remove the tire liner and pull out the bad inner tube. The tire liners are expensive, and didn’t work for me.I went back to YouTube, watched more videos on how to prevent flat tires.I stumbled upon some YouTube videos about flatout tire sealant.One of the Youtube videos shows a guy using flatout and then putting nails and drilling holes into his bike tire, and the FlatOut sealed the nail punctures and the drill holes.I was so impressed, I bought a couple gallons of flatout. There are different grades of flatout specific to the kind of tire. They have a grade for motorcycle tires that I use on my fat tire bike and a grade for regular sized bikes that I bought for my other bikes.The flatout really works. I'd go through nails, screws, big staples, and glass, get all kinds of punctures, and the flatout sealant would squirt out the holes and I'd just keep my bike going at a nice and steady speed, and the tire would seal.It's important to keep the bike rolling when you're experiencing a flat. It helps the tires seal properly. If you were just to pull over and stop your bike the sealant wont seal as well. So keep on rolling when you get that flat.Sometimes the sealant will get on the fender or the side of the bike. The sealant is non-toxic and is easy to wipe off.I had nine or ten punctures in the tire before I finally decided to put in a fresh inner tube and more flatout.Since using FlatOut, I haven't had to walk my bike home.I wish I had known about this product years ago.

So far so good! Used it on my fat tire commuter bike. Gives me a sense of security knowing I can make it home if I get a puncture in my tire when I'm far from home. Excellent product!

Only complaint is the valve stem removal tool. On both bags they tore and some plastic got stuck in my valve stem. I recommend buying a proper removal tool.

At first I thought it didn’t work but patience is key.

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FlatOut Sportsman formula is not expressly labeled as being usable in bicycle wheels, so I called them up and ended up speaking to their product manager who specializes in the bicycle segment. This Sportsman formula was tested extensively with a fat hunting ebike manufacturer. The test environment was heavy bikes traveling over remote trails and overland. The Sportsman Formula IS recommended for bicycles.For fat bikes, the dose for a fat tire (26" x 4.0" and above) is half of a bottle. For Plus sized (roughly) 3.0" tires, its 12 ounces. Scale down from there for smaller tires.On the pictured cargo bike, with 26"x4.3" factory tires and different wheels, I had a jagged piece of metal insert itself into the tire. I was able to pull it out and roll the tire and FlatOut sealed the breach. It was a big enough tear that it very much lends credence to their 1/2" hole capability claim. Given its performance on that and a couple of other pinhole (goathead) punctures, it has totally replaced my use of the other leading green-colored brand. I am running it, so far, on 3 separate bicycles.The fact that this sealant never dries out and lasts for the life of the tire is a major benefit. The fact it claims the ability to seal holes double the size of competing bicycle tire/tube sealants is a bonus on top.TUBELESS BICYCLE SETUPSWhen I spoke to FlatOut, the sealant had never been tested as a tubeless sealant. Its life-of-the-tire durability, plus its ability to seal larger holes attracted me to it as on my large cargo/bikepacking bike flats are a disaster and often on the street are past the capability of the water thin sealants in common use. This stuff is thick and better suited to holes both big and small. The FlatOut product specialist I talked to recommended - to be sure of a bead seal to the rim - that I paint the tire bead with FlatOut on the outside where it contacts the rim to ensure bead and rim form an airtight seal... and give it a try. Well, I wasn't able to do the bead-painting, and instead treated the installation like a standard tubeless install, adding the sealant after using air to seat the tire bead. It has worked PERFECTLY. I couldn't ask for better. No air loss whatsoever in the tire over time (the pictured bicycle wheels tubeless and are the ones I put FlatOut into).In the picture attached to this review, I changed from 80mm rims and 26x4.3" tubed tires, which were my first FlatOut test - to what you see in the pic now: 90mm rims, set up tubeless, and 26x4.8" tires with 16 oz of FlatOut inside each tire.NOTE:FlatOut seems to spread itself evenly around the interior of the tire and stay that way even after sitting for a bit, as even though there is considerable sealant inside the tire, there is no sloshing or unbalanced rotation.PRO TIP: Flatout has a resealable application hose built directly into its lid. If you have presta valves, just take a common, cheap presta-to-schrader adapter and put it over the applicator hose. Then when you remove your valve core to inject the sealant, simply press-fit the adapter to the un-cored valve. The o ring already inside the adapter will provide a seal and you can easily inject FlatOut into the tire.