I haven't checked for cracks, but when I removed my snow tires this
spring, I found that when my state safety inspection was done (which
requires removing one wheel), they tightened the lug bolts way too
much. I couldn't even remove them with an electric impact wrench. Do
you think your cracks could be from improperly tightening the lug
bolts? If you have an alloy wheel for the spare, I'd switch it with
the cracked one.
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