Ill have to measure the axles, but i thank they are 3 1/4. They are the same as a 3588 because thats where i got the other tires i put on it. Axles are smaller than a 1086. The last time i was able to get a price on new tires, they were over $2000 each. The last couple of places locally I have tried lately, they couldnt get that size.