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@Smallfurry
I run 22/19mm R/F on the fixed, and 25/23mm R/F on the road bike. As 60% of your weight is on the rear it usually needs higher PSI. Running a bigger rear, reduces the pressure needed there, and gives a bit more contact patch for drive.
Running the same size tyres front and rear. When these wheel carry different weights, and do different jobs. Seems pointless.