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When you pull the cast center off, you will find a splined axle with a diameter smaller that what you see exposed when the center is on the tractor. I believe the spline section OD is 3.375" but I don't have my specs in front of me. I know of four ways of installing 9 bolt wheel on an R, 80, 820, or 830. First, weld flanges to the axles and forget about ever installing the cast centers. Second, contact 2 cylinder salvage and purchase their 9 bolt hubs that are made by cutting down cast centers. I think they want $600 and your cast centers. I saw a set at the New York Expo and they didn't look bad. Third, find a set of JD 4020 dual hubs (the key here is John Deere brand hubs). The JD hubs use the same wedge principle as the 4020 cast centers (and most other tractors). You can cut the key down to fit into a spline groove and tighten the wedges real good. I have been told it doesn't hurt the splines, but I have yet to see an axle that has had this done. The forth way is to make your own. I tried this and ran into problems when trying to get someone to cut the splines. The hubs are over 9 inches long. The shops I talked to said the splines were to long. I even pointed out that the splines are only about 3 inches at each end of the hub and the center is open. Still no dice. If you want any more info, drop an email. Eric Horne
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