It's 15 inch, however I've never tried it on the car so I only have the seller's word that it's off a bravo (not very likely to have sufficient spare time/energy to check!). I had to cut down the plastic tray when I changed to a full size 18 inch spare, the good news is that it can be made to fit. Originally I had the pump and gunk set up, never liked the idea of that stuff.