You know Allan, I don't know the answer to that, but I'm going to find out myself. I just had new radials put on my 4520 because mine were at about 30% and needed new tires. My outers when I use them are about 80% and biased ply. When I put them on, I'm going to find out. Now, I didn't go with the most expensive radials because I've never used them before, don't know how they'll perform on a lighter tractor. I'm thinking that they're really for much bigger. They cost me about $400 a piece more than the bias ply, so not really bad. I went with Titans. I could've gone with Goodyear, Firestone, or Michelin, but when get into the radials, start talking $$$. Again, I went for the less expensive Titans. Cost me about $1K a piece to get done. My bias plys bars cut across the centers, my radials stop near center and are supposed to clean better. One thing's for sure, compared to the old 30%ers I took off, these guys really pull and I'll be using them far more alone than as duals. Should I mix bias plys and radials? Got me. I'll be mixing radials with more shorter bars mixed with bias with less longer bars, so something's gonna happen, and I'm thinking the bias will be taller in my case...bars going beyond center...but then again, 80% versus 100%. I don't know yet. You know who would know the best? A tire guy. I got mine from the Deere guy because he was closer, and the cost and labor was comparable. But, I had to do my own homework as to what I think might work, for what I hope will be a good setup. A tire guy probably could've called me a nitwit right off the bat, or said might work. The Deere guy's better at tractors than tires, the tire guy's better at tires than tractors. Me? I'm a novice compared to either of them, but like you, I'm trying. Good luck Allan.
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