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Using my mental calculator and rough numbers...
The difference in tires is a factor of 1.07, so divide your current gear ratio by 1.07 and you should have your new "effective" gear ratio.
meaning a 3.73 with 28 inch tires will now act like a car with 26 tires and a 3.50 ratio etc..

Slower? Maybe, it's just like using the next number lower gear ratio I guess.
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