Tire sizes... please help?

A fundamentally bad idea.

First off, and least importantly the P205/65R15 92's have an overall diameter of 25.5 inches compared to 29.0 inches for the P235/75R15 105 or 108's. That is a lot. Tread width is of course considerably narrower which combined with the smaller diameter makes for a much smaller contact patch and therefore less cornering traction and much longer braking distances.

Perhaps more importantly though is the dramatic reduction in load carrying capacity of the smaller tires. At 35 psi a P205/65R15 92 tire has a load capacity of 1,400 lbs. A P235/75R15 105S tire at 35 psi has a load capacity of 2,028 lbs or a P235/75R15XL 108S at 41 psi has a capacity of 2,183 lbs. An overloaded tire will overheat and self-destruct into millions of tiny bits. More than a tad dangerous.

Short version, don't do it.

Well, if you're talking about swapping the tyres and keeping the same wheels on the truck then they might be just a bit too narrow, there's a big big difference between 235 and 205.

But if you're talking about completely different wheels then it all depends on getting the right wheel for your truck, not the tyre. If the nut holes on the wheel match the hub on the truck, then it's all good

These will fit since you are going down a couple of sizes but the smaller tires will give you a different speedometer reading. It might look like you are doing 60MPH but you're only doing 50MPH.

Good Luck!

The ones you found will be to small. that is they will not fit the rim correctly and they my affect your speedometer reading

They will fit but are designed for a lighter vehicle.

They are significantly smaller. They are narrower and shorter. They will probably mount up, it'll probably just look silly.

DON'T BUY THEM........

1. TOO SMALL.

2. UNDERRATED