Fat tire ebike using flatout to prevent flats

Jbiker1

Member
Region
USA
Is anyone using Flatout for flat prevention on fat tire ebikes ? Bolton ebikes has a pretty convincing video testing Flatout, Slime and other flat prevention methods. I am new to ebikes. Have an Aventure. I ride mostly on the road(pavement). I will be riding some greentrails and occasional dirt roads. No issues with flats yet. But haven't ridden very far yet, q2 miles longest ride. so far. I have saw where some people have had some success with Slime. I don't have the source handy. But I previously found info where Kenda says not to use Slime in their tires. Is this also true for Flatout??
 

rawlus

Active Member
Region
USA
the slime or flatout goes in the tubes not the tires so don’t know what Kenda is even saying.
fat tires with their lower pressure and more contact area are more prone to flats than others i believe,
im using tuffy liners between tire and tube + slime.
other option is just a patch kit and an air source (i have this also, planned redundancy!).

i mean flats aren’t the end of the world and slime/flatout isn’t the only solution.

flatout has very good reviews so if youre vibing on that go for it. even if it’s not 100% effective, everything counts right?
 

Merle Nelson

Well-Known Member
Region
USA
Flat out - for when you get the 1/2 inch puncture. :)

Besides that claim to fame they say it washes up with water better and lasts an inordinately long time before needing a refresh. (They used to advertise forever as I understand it)
 

Jbiker1

Member
Region
USA
Looked like it beat other methods. Hands down. Just wondering if any issue with kenda tires. I know it goes in the tube. But will come in contact with the tire. If tube is punctured. Flat out demo with tube. Looked about as good as tubeless with sealant. Almost.
 

Gordon71

Well-Known Member
Looked like it beat other methods. Hands down. Just wondering if any issue with kenda tires. I know it goes in the tube. But will come in contact with the tire. If tube is punctured. Flat out demo with tube. Looked about as good as tubeless with sealant. Almost.
Have 26"X4" Kenda's on my bike. First flat at about 600 miles. Installed new tube and Tuffy liner in the rear tire that went flat and then slimed both tires. Bike now has 2700 miles on it and no flats since. Also has not so much as lost a single lb of air pressure either and I keep them at 20PSI.
 

AHicks

Well-Known Member
Region
USA
City
Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
Flat out or Slime, take your pick. Though I will mention Slime is also water soluble for easy clean up if necessary, not going to debate which is better. The bigger point is if you want to minimize flats best possible, get SOMETHING in that tube!

Makes absolutely no difference what brand tire or what size it is. When it comes to bike tires (or lawn equipment!), the stuff works, it's cheap, and it's easy to install.
 

Tars Tarkas

Well-Known Member
I've never used anything but Slime and I can vouch for it. Other brands, I don't know, but as a concept, sealants are great.

TT
 

Altaman

Member
Which type of Flatout are you putting in your bikes, they have multiple types (Sportsman, trailer, outdoor power equipment)...I am leaning towards the Sportsman,
 

Jbiker1

Member
Region
USA
I havent tried any yet. I was comparing it to Slime. Maybe check Bolton bikes video demo, see which one he used? I'm not using anything yet, I have a almost new bike, ride mostly on the road, plan to rude greentrails. No tire problems except for a slow leak out of the box, replaced the tube
 

AHicks

Well-Known Member
Region
USA
City
Snow Bird - Summer S.E. Michigan, Winter Gulf Coast North Central Fl.
I havent tried any yet. I was comparing it to Slime. Maybe check Bolton bikes video demo, see which one he used? I'm not using anything yet, I have a almost new bike, ride mostly on the road, plan to rude greentrails. No tire problems except for a slow leak out of the box, replaced the tube
The better plan is to get something in those tubes BEFORE you have a problem! That what this stuff is all about, minimizing the potential for trouble.....

My new bikes/tubes don't go 10 feet without the tubes being Slimmed (or whaterver product you choose).
 

m@Robertson

Well-Known Member
Region
USA
Flat out - for when you get the 1/2 inch puncture. :)

Besides that claim to fame they say it washes up with water better and lasts an inordinately long time before needing a refresh. (They used to advertise forever as I understand it)
They still do. Officially its 'up to 10 years' but that translates to 'life of the tire'

FlatOut is, hands-down, better than Slime. After some major events where I know Slime couldn't have coped, I replaced my Slimed tubes I have with others that have FlatOut in them.

- a strip of 6 roofing nails from a nailgun. SIX nails. Tires were Snowshoe XLs (and they were running tubeless) on a cargo bike coming back loaded from a Home Depot run. Thankfully my bike-battery-powered air compressor always goes with me as I spun the tires but was losing so much air, I needed a refill. Then rode the bike about a block until I needed another refill, and repeated that three times as the air escaping slowly decreased. On the fourth air refill the last of the hissing stopped and the tires have stayed inflated ever since. No repairs necessary.

- A big jagged piece of metal. Oddly it was the same cargo bike a few weeks earlier on my street wheels which were running with tubes. Big nasty piece of jagged scrap metal. Dark night time commute home. By the time I got stopped, the 4.3" Surly Edna tire was essentially flat. Used my trusty compressor to refill. A block later refilled again. That was it rode home. When I changed wheels a few weeks later, I found the hole in the tube had dried into a hard nub, unlike Slime which leaves an often-weepy soft plug that may be still leaking air very slowly.

I called FlatOut on the phone and got their product manager in charge of dealing with bike compatibility. He confirmed the Sportsman Formula was the one they had tested with BackCou ebikes. This conversation, which I reported pretty widely at the time, is where the 16 oz dose for a fat tire comes from. I also sounded him out about using it as a tubeless sealant and he stated they had never heard of it being done, and it should work if I painted the tire beads in advance with some to help ensure a seal. In the end I didn't need to do that and it still worked like a charm. No leakage and no top-ups needed after weeks, and as I found out the hard way, it works to seal tires great. I had one more on the tubeless wheels. I heard hissing up front and got the bike stopped to try and pull out whatever it was. Found nothing but a half-dry wet spot with no visible hole and no air leakage.

As for Kenda tubes, I slimed them back in the day and they worked fine. BUT since the valve cores were not removable, you had to stab a hole in the tube and inject slime with a meat marinade injector, then patch the hole. Maybe thats what Kenda was getting at as no you cannot inject Slime thru the valve given the non-removable core.

 

Jbiker1

Member
Region
USA
Are you using kenda tubes ?Same procedure to fill with flatout,I assume?
I assume my front tube is zkenda. Not sure about rear replaced with tube I hot on Amazon. Flatout sounds like great stuff.
 

m@Robertson

Well-Known Member
Region
USA
Are you using kenda tubes ?Same procedure to fill with flatout,I assume?
I assume my front tube is zkenda. Not sure about rear replaced with tube I hot on Amazon. Flatout sounds like great stuff.
Kenda with Schrader valv'd tubes: Yes just remove the core, attach the hose from the bottle (contained inside the lid) and squeeze until done. Screw the core back in and reinflate.

Kenda with presta valves will require the meat marinade injector method to insert the sealant since the valve cores are not removable. There is another method that involves partially disassembling the Presta valve, but poking the hole is the best method. After you have done it once and see how well it works, you won't be afraid of it again. And from that moment on you will buy presta tubes with removable cores. They are easy to find. Bontrager and Vee are two that both use thicker rubber.
 

m@Robertson

Well-Known Member
Region
USA
Here is the standard way Youtubers recommend to do slime with a non-removable Presta core


Here is how I do it (this is not my video). I have done this literally dozens of times over the years. I use a Rema patch to seal the tube permanently and immediately although I let it seal itself on my first try: