I used a tire diameter calculator off the net. I can only suppose my spare is,similar diameter to the tires on the car
My.pirellis are 27.2" diameter
Your tires are 28.9" diameter.
I can still check the spare tonight after the kids are in bed. My wifes a nurse, she works nights on the weekends, so i babysit the kids. I get to do my stuff when they are in bed.