You did not explain why you must replace the tire. If it is small seepage bubbles (seen when a spray of soap/water is applied) and it holds for about a day or more I would deflate the tire, remove the shrader guts and put in about a cup of SLIME. Rotate the tire slowly after putting air in it and your tire will last for years. If you have a large gash and need to replace try tractor supply, or internet search.

no, i found super lug in this size tire, and yes, i do need a slightly more narrow tire. I had 16x6.50x8's on it, some cheap brand that only says "made in China" on them, and it was ok. I busted one and put on a Carlisle of same size and the Carlisle is least a inch wider, so when i run over something that lifts that side up, and i am in a turn, it rubs pretty good against frame. I could use small trailer tires, hi speed ones in similar size, but the tread is so smooth on them.And still i havent saw any yet to determine height or width, just thought someone may know. Here is the lug tire page in size in question. I would rather have the 16x6.50's cause they are 4 ply. Just dont know if they would be width of my originals or the width of the wider Carlisle i have. This is on a homemade tractor, so there isnt any original size that came on it. Here is a link that might be useful: 480/400x8 super lug

ngslc, I found a thread on a different forum by doing a Yahoo search "John Deere AWS 425 tire size" search. In the thread, a poster said that he had replaced the 23" std. rears with 26" ag lug tires and "the fit under the fenders was tight". But the poster also indicated he had these tires mounted on wider than std. wheels also. (wider wheels can result in slightly lower overall diameter than with narrow stock wheel). You will probably want to find a tire to fit your stock wheels that has a larger diameter instead of going all out with new wheels and tires. Anyhow, I'm going to guess that 26" is probably the max you will will get under the fender without mods to the fenders. Remember, 3" taller tire increases your ground clearance by roughly 1 & 1/2". Hopefully some other forum members who have "been there-done that" will post some specific brands and sizes to help you decide.

I've been through the same dilemma with my GT series tractor. I just put Carlisle Tru Power lug tires on the rear. I opted to keep the turf tires on the front because they're actually a pretty good all-around steering tire. I don't think chevron-lug-type tires on the front would serve any benefit unless you had a 4x4 tractor, which you don't. I haven't found a true agricultural rib tire for lawn and garden tractors, but you might want to look at the Carlisle Snow Hog in a 15x5-6 for some ultimate steering traction. Other than that, I think you're pretty much stuck with turf tires in that size.