I am pretty sure we have both discussed Flatout only working on lower-pressure tires. I have it working successfully on two tubed tires, where one is 40 psi and the other is up to 60. My 29er enduro uses Flatout tubeless on tires that are a 29x2.3/2.4 Maxxis Assegai and Minion. But thats not much of a sample.the biggest problem with sealants is they are designed for tires with no tubes. plus the PIS of your tire is a big issue. so more then 50 PSI and there is less chance it will work. Stans seemed to work sometimes at 70 psi. you also have to be able to remove what's in the tire. often I cant find it its either non or often pushed in all the way so you cant find it from outside so it won't seal. if it is raining it does not seem to work either.
so far Stans has worked the most times though not much. tried the slime and flat out with less reliable results. trying muck off right now.
I am taking my Apostate tubeless - probably tonight or tomorrow - using 60 psi 26x2.30 Maxxis Aggressors. Before I committed to doing that, I wanted to call the Flatout people and ask them about the product on these smaller volume, higher presure tires - why do they only advertise its use on fat bicycle tires, and what of the tire pressure issue? In particular does the higher pressure cause the stuff to just squirt out and not work?
The answer I got was
- They have just gotten around to really adapting their marketing to mention bicycles at all (its only on their web site, not the product labeling).
- Smaller volume tires will work just fine, they just haven't finished their testing on them and cannot yet recommend a dosage amount. However they do know that - and I'm quoting here - "air pressure does not have an effect".