BT45V it doesn't say that they are bias ply loike all the other bias ply tires. sooo I assume they are radial..........maybe I am wrong
Looking at the Tire sizes available, unless you go with the BT45 (which I wouldn't) you can't get a 140 size tire without going to a lower 70's profile, which will decrease your rear height. I'm pretty sure they are Bias-Ply.