Farm_Kid2
Guest
Ed, The radials work great. Even if you stay with the same size, the radial helps you stay on top of soft ground because you can run at lower pressures for the same load. For example, using Firestone data for 30.5-32 tires, the bias tire is rated for 9350 lbs at 20 psi and the radial version is rated for 9650 lbs at 18 psi. As for the 710_75-34, it is rated at 9650 lbs at 17 psi. So, you correct that you are getting a larger tire with more load carrying ability in the 710. The 710_70-38 is basically the same tire with the same rating, and I think it is easier to get in the higher ply ratings, so it would probably be a better choice for combines since you have to change rims anyway. If you want to keep your width down but really need to increase your tire size, the Trelleborg 850_60-38 in 14 ply rating is the way to go. It has a rating of 9700 lbs at 12 psi. or 12,895 lbs at 18 psi. It would be the combine tire of choice for all the Class 6 and 7 machines, in my opinion, if Goodyear and Firestone didnt have the equipment manufacturers in their hip pocket. If these numbers seem low, it is because they are all based on 25 mph. You get to increase the load on a combine tire because they operate at lower speeds when they are fully loaded, and the loads are cyclic in nature. How much you get to increase the loads is kind of tricky to figure out, but for the Trelleborg they claim 16,093 lbs at 15 psi, which is about what your 1688 weighs on the front with a 25 head and full of grain. If you can take the air pressure down to 15 psi, youll be amazed at how few tracks you leave in the field when it is soft. Make any senseIJ Mike