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This tire needs replaced, no tread for a 12~ inch section. Is what I get for assuming and using a flimsy tape measure. This tire only had 115 miles on it, and now it is bald in one section. /sigh
What I did was to find some sure fire method to get a firm, yet accurate measurement. Tape measure wasn't being cooperative. Too flimsy and not working on level ground. So I used a fiberglass rod from a cheap broken flagpole & a pencil.
Set the rod at lateral midpoint: inside rim of opposite wheel -> to the other wheel. Measured at the center ^ midpoint of rim. Made a pencil mark.
Repeated the same lateral midpoint for back measurement. Back and forth till both measurements were right on. Put some blue Loctite on the threads, finger tightened both ends. Then used a wrench on direct steering rod at the flats section, and another on bolts to firmly tighten. Rechecked alignment, looked good.
Finally used the tape measure from middle of one tire to the next. Is at 29 7/8 inches on the Road Cruiser tires, front and back, as a triple check.
Will probably upgrade to Marathon Plus tires even though was hoping I could wait. C'est la vie.