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Golf carts are almost universally 4x4" bolt pattern. I think the Austin Mini used that pattern and essentially the same size wheel/tire as golf carts, only a bit narrower.
You can get ultra-lightweight single-pieced forged alloy wheels for racing minis (wheel is IIRC 12" and like <8 lbs) and DOT winter tires from Yokohama and the mounted/balanced wheel and tire are <17 lbs. I know someone who tried this on a golf cart to improve ride on pavement-only operation, and I want to say it was right at $100 per corner for this.
The winter tires were used because they were the only thing (or the only light thing) available in the OD required for a golf cart. Stepping up the OD slightly would probably open a few options, reduce rolling resistance, but slightly increase weight and inertia.
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