Hey no worries, happy to help! Did another explore and here's what I got.
Compatibility Check:
Your measurements suggest that the bolt patterns might line up, but keep in mind that the Case 580 (backhoe) and Case IH 385 (tractor) wheels serve different purposes and have different offsets:
Front wheels (6-lug):
The Case 580 front wheels are narrower and built for steering on a backhoe. They might fit on your tractor, but they could throw off the steering geometry and stability. Also, the 7.50-16 tires are a lot narrower than your 9.00-10s.
Rear wheels (8-lug):
The 14.9-24 tires are taller and narrower than your 18.4-16s, which will raise your tractor and could make it less stable. The offset might push the wheels in or out, affecting the track width.
Concerns:
- Offset differences could lead to rubbing or handling problems.
- Changing tire diameter can mess with gearing and the speedometer.
- Mixing industrial (580) and agricultural (385) wheel designs isn't ideal.
Recommendation:
Make sure to measure the offset on both sets before you buy