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geezerglide , assuming that you are replacing 255/50R20 wheels/tires with the 255/45R20 ones, according to 1010tires.com, your diameter variance will be -3.34%. The generally accepted maximum variance is 3%. This would mean that if your speedo showed you were traveling at 100 kph with the 255/50R20 setup, you would actually be going 96.66 kph with the 255/45R20 ones.
Peter
Peter