So I've tested several tires from Jeff at Tubliss suggestions, the trend seems to be that the name brand tires work and you do get better traction with Tubliss even on the name brand tires but.... It's interesting that the cheap tires are working as good if not better than the more expensive name brands.
A short list of tested tires
IRC m5b rear
Pirelli xcms front and rear
Kenda washougal front and rear
Kenda millville 2 rear
Mx32 front
Bridgestone M59 front
Artrax SE3 front
Artrax tg4 rear
AT81 front and rear
Sedona 880 rear
Sedona 907 rear
Shinko 520 rear
Michelin x12 front
Mx51 front and rear
These are few I've tried, the current leader of awesomeness for a rear tire is the ,believe it or not ,the Shinko 520 run at 3-4psi. I highly recommend this one for a do it all rear tire, it will work in just about anything and grabs like a toddler on rocks and roots, works in mud and sand as well as grass and harder packed terrain however hard pack is not its shinning glory.
The m5b/mx32 front combo Is my go to mud set up with 8-9 psi rear and 10 psi front.
The washougal set is a great mid/ hard pack set and will make its way through the mud if called on but they won't shine. Front 10-11psi rear 8-10psi
The millville 2 rear is mediocre and for the money there are better rear soft terrain tires I feel.
The bridgestone m59 front and the sedona 907 rear are a great rock set up. Consider the rear a trials tire with braking, it still corners like a trials but is better I feel. Front 10-12psi rear 5.5psi
The pirelli xcms is a decent soft terrain set up I personally don't care for the rear but do like the front quite a bit for a do it all tire in the Midwest. Front 10 psi rear 10psi.
The sedona 880 rear is a stout rear that can run at zero psi yes zero, which comes in handy for rocky nasty races. It was the top rear do it all tire until the Shinko was found. Rear 1-3 psi
The Artrax SE3 front and tg4 rear are actually a great set up. The front for me is tied for 1st with the m59 and xcms fronts. The rear works nice in Sandy to hard pack. Front 5.5psi rear 5.5psi.
The Michelin x12 I wasn't impressed or unimpressed with it did everything but to me wasn't confidence inspiring.
The at81 front and rear I haven't had much time at all on and these are the standard not the RC (desert) version. My first impression is that I may not like the front as it feels a little unpredictable at full pace however the rear may be a nice soft to intermediate tire but I am thinking it will not like extreams of hard or mud. I also have some longevity consern as they don't appear as though they'll last the long haul. Front 9-10psi and rear 8psi.
The mx51 front and rear are not a fav. The front is my least liked front and the rear is my least liked rear. I found myself in a constant two wheel slide in and out of every corner. The only place I ever found this set to shine was in a grass track setting where it did grip fairly well.
What are on my rims right now, an xcms front and the Shinko 520 rear do it all. The mx32 front and irc m5b rear mud. And the front and rear At81 set for testing and had thought for dryer conditions but have yet to confirm.
It would be interesting if anyone else had other tire with Tubliss psi numbers to add and their experience with terrain.
A short list of tested tires
IRC m5b rear
Pirelli xcms front and rear
Kenda washougal front and rear
Kenda millville 2 rear
Mx32 front
Bridgestone M59 front
Artrax SE3 front
Artrax tg4 rear
AT81 front and rear
Sedona 880 rear
Sedona 907 rear
Shinko 520 rear
Michelin x12 front
Mx51 front and rear
These are few I've tried, the current leader of awesomeness for a rear tire is the ,believe it or not ,the Shinko 520 run at 3-4psi. I highly recommend this one for a do it all rear tire, it will work in just about anything and grabs like a toddler on rocks and roots, works in mud and sand as well as grass and harder packed terrain however hard pack is not its shinning glory.
The m5b/mx32 front combo Is my go to mud set up with 8-9 psi rear and 10 psi front.
The washougal set is a great mid/ hard pack set and will make its way through the mud if called on but they won't shine. Front 10-11psi rear 8-10psi
The millville 2 rear is mediocre and for the money there are better rear soft terrain tires I feel.
The bridgestone m59 front and the sedona 907 rear are a great rock set up. Consider the rear a trials tire with braking, it still corners like a trials but is better I feel. Front 10-12psi rear 5.5psi
The pirelli xcms is a decent soft terrain set up I personally don't care for the rear but do like the front quite a bit for a do it all tire in the Midwest. Front 10 psi rear 10psi.
The sedona 880 rear is a stout rear that can run at zero psi yes zero, which comes in handy for rocky nasty races. It was the top rear do it all tire until the Shinko was found. Rear 1-3 psi
The Artrax SE3 front and tg4 rear are actually a great set up. The front for me is tied for 1st with the m59 and xcms fronts. The rear works nice in Sandy to hard pack. Front 5.5psi rear 5.5psi.
The Michelin x12 I wasn't impressed or unimpressed with it did everything but to me wasn't confidence inspiring.
The at81 front and rear I haven't had much time at all on and these are the standard not the RC (desert) version. My first impression is that I may not like the front as it feels a little unpredictable at full pace however the rear may be a nice soft to intermediate tire but I am thinking it will not like extreams of hard or mud. I also have some longevity consern as they don't appear as though they'll last the long haul. Front 9-10psi and rear 8psi.
The mx51 front and rear are not a fav. The front is my least liked front and the rear is my least liked rear. I found myself in a constant two wheel slide in and out of every corner. The only place I ever found this set to shine was in a grass track setting where it did grip fairly well.
What are on my rims right now, an xcms front and the Shinko 520 rear do it all. The mx32 front and irc m5b rear mud. And the front and rear At81 set for testing and had thought for dryer conditions but have yet to confirm.
It would be interesting if anyone else had other tire with Tubliss psi numbers to add and their experience with terrain.