No...no....no..!
All wheels and tyres must be the same size.........using anything else on yer hippo will make yer drivetrain go bang big time and leave you with a very expensive bill.
And if you ever fit new tyres these must always go on the rear.
 
And rotate them! You're spare shouldn't be fresh - it should have the same wear as the others, moving them from hub to hub every few k ensures this.
 

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