We had a swather that had 7.50-15 tires like these. I would say that they are a little taller than a 235 75 15.

Also know that tires like these are not speed rated... Like maybe 30 mph max.

And are terrible in the snow if you are talking about a "snow plow" truck. Many people run chains on their tractors in the winter because the tires are too hard to stick to the ice/snow pack.