If I understand the tire numbers correctly, your old tires were 773.9mm tall (ground to top of tread), and new ones are 833.9mm tall. Since the distance is related to ratio of the circumferences and the rotations per time, if we hold the rotations per time constant it reduces down to the the ratio of the diameters. 833.9/773.9 = 1.0775 1.0775*75mph = 80.8 mph
Please note that I am assuming the tires are perfectly rigidly round (no load on them) AND that you speedometer is accurate for the original tire size. With these considerations the increase in speed shown above is an upper bound limit.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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