Originally Posted by TerryR
Steve,
I eagerly await your response to this. The problem as I see it, is that the MB SLK has 19" all round, and the Crossfire has 18" Front 19" Back. The Outside Diameter of the tire MUST be different, OR why would the manufacturer fit different size wheels Front & Back. Make sure you do not do any Damage to your Car.
The 2003 SLK320 comes with 205/55r16" in front.
225/50r 16" in the rear.
The Crossfire uses 225/40r-18" in front.
255/35r-19" in back.
The rear tires on the SLK and the Crossfire are approximatly the same diameter (only about an inch difference, so there should be no reason Steves inflatable spare should cause any problems.
The front tires on the SLK and the Crossfire are nearly identical in diameter so the spare should fit just fine.