Toyo AT II in R18 are not LT

Light Truck ,
heavier construction of side walls for extra load, eg: towing large trailers
a lot on google , Coopers Tires have a write up , how this stacks up against load rating I don't know.

I run a LT285 70 17 Kumho Adventure 10 ply with a 121 rating and a loud radio, but are they a heavier rating than a Passenger tyre ?

Bob

Peter is correct at the end of the day it is the load rating that counts. It is true that LT generally means thicker sidewalls and generally a LT rated tyre of the same size Passenger rated tyre will have a higher rating. But a 125 load rated passenger rated tyre will be a stronger tyre than say a 120 load rated LT tyre.

The passenger rated tyre will have a more flexible sidewall so can dissipate heat better than a LT that has a stiffer sidewall - so in theory a passenger can go a bit lower pressure without over heating the sidewall but the downside (maybe) is that the walls balloon out a bit more

So it is important to understand what the numbers and letters mean - a LT is not necessarily a better tyre but in many circumstances it is.

The load rating for my vehicle is 109 and I run passenger rated tyres of about 120 load rating because my use is mainly onroad and occasionally offroad and they work well - however if I was to pack up, load up the car more than I do and tow a wobble box around Aust I would probably look at something differently - but if aired down on corrugations with LTs I would be regularly checking temps of the sidewalls because they will not flex as well as others.

I suggest that it is also worth understanding that the sidewalls of a tyre do pretty much nothing in terms of supporting the weight of a vehicle. That is done entirely by the air.
Let all the air out of a LT tyre to check. It will be as flat as any tyre but those thick walls will not thank you for it. :(
Cheers,
Peter
OKA196 motorhome

Yep you said it
They don’t add LT, because they are “real “ truck tyres
Cheers
Shane

So did they tell you what it means?
Cheers,
Peter
OKA196 motorhome

Maybe the reason for not being LT rated is because, as Peter mentioned, the 18 " rim for the same OD tyre has less AIR under the rim to hold it up off the ground. If going to 18"/ 65 aspect it then has around 12 to 13 mm additional under the rim and so could easily be the reason for a higher rating. A 17" rim with the same OD as the 18" rim fitted with a 60 aspect tyre, will also have MORE AIR under the tyre to carry load. Also better if used on corrugated roads with a degree of deflating. Hitting/bottoming to the rim isn't good for tyres. Not sure what I will do when buying a new vehicle. I certainly do not want 18" rims.