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I can't really recommend one brand over another, but I found the attached spreadsheet helpful in sorting out the financial impact of each tire...
Two ideas: 1) Buy one of those telescoping rods with a magnet on the end (Try Harbor Freight Tools) so you can shove the magnet down past all that...
Ahh..you are absolutely correct! Thanks. I looked up a later version of the PSD equations and it showed a different (correct) multiplier for Gen...