One option for scroungers is to use four compact spare tires. They only last 10,000 miles, but they are almost free for the picking. Take a measuring stick to the wrecker's to check hole spacing. To re-figure your odometer, stick some tape on your tire so it hangs off the side. Roll onto it and mark the pavement. Roll another contact or so, and measure the gap. Then, do the same with the new tires. Divide one into the other, and there's the fiddle factor for your instruments.
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