Heavy Truck Tires

[charlieaarons]

Before you go to the r20s, do you plan South America? R20s are unavailable in South America. Strange but true. A 365 or 395 22.5 is a better choice for 99% of your driving.

I don’t believe those sizes exist in 22.5. There’s 385/65R22.5 (common worldwide), and 425&445/65R22.5, much less common.
And then there’s the issue of beadlock availability, for preventing debeading at low pressure.
I’m not aware of any beadlock availability for xy.5 tires and wheels (2 piece wheels are necessary for internal beadlocks) with the unusual exception of 2 piece Humvee 16.5”.
Lots of people don’t think they’ll ever need to deflate their tires to prevent getting stuck (or to get unstuck). Until they do. Debeading is a fairly gruesome and effective way to ruin your day.

 

[Joe917]

I don’t believe those sizes exist in 22.5. There’s 385/65R22.5 (common worldwide), and 425&445/65R22.5, much less common.
And then there’s the issue of beadlock availability, for preventing debeading at low pressure.
I’m not aware of any beadlock availability for xy.5 tires and wheels (2 piece wheels are necessary for internal beadlocks) with the unusual exception of 2 piece Humvee 16.5”.
Lots of people don’t think they’ll ever need to deflate their tires to prevent getting stuck (or to get unstuck). Until they do. Debeading is a fairly gruesome and effective way to ruin your day.

I regularly aired down to 70psi for comfort and 40 psi for soft stuff with the 315 22.5 80. That tire is too narrow. Sure you're not going to go down to 10 psi with it!

 

[Iain_U1250]

Thank you. I don't have those kinds of wheels. I need to find a video on how to change a spare that doesn't have a rim on to the rim of the damaged tire. I also need a good list of what tools I need to make this spare change out in the field.

I made a video on how I swapped my tyres on normal wheels and the two piece wheels.
You will need a proper bead breaker and tyre irons, not the little ones for car tyres. I got the proper Michellin set of three, they are great. I use Tyrepliers to break the bead on the tyres.

As far as 20" wheel vs 22.5" wheel go for off- road trucks.
These are the normal 20" rim contour - they make sure the tyre stays on the bead at lower pressures.


This is the 22.5" wheel rim conour, much lower, makes it a lot easier to get tyres on and off, but you need to keep the tyres at a higher pressure or they will de-bead and ruin your day.

 

[mog]

Sample of 20 and 22.5 rim profiles

 

[Blowby]

Some great information here, and thanks for sharing it in a manner I can understand.
We are running 385/65R22.5,s and I am in the process of getting a deflation system setup so that we can be a little more comfortable off-road, so this being said would you guys advise not to go below 40 psi for this particular tyre.
Thanks Roger

 

[Joe917]

It's not just the airing down, it's how you drive. Straight you're pretty safe but hard turns or off camber and you could be in trouble. The tire manufacturer will have a table with weight, tire pressure and max speed.

 

[MiwatoMikoto]

I’ve been running 11R22.5s on my rig for years without issues. Load range H gives me peace of mind with weight, and they last way longer than the standard light truck options.