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07 C230 sport tire size

6K views 2 replies 3 participants last post by  roller1150 
#1 ·
I'm getting new tires for my wife 07 c230, so I checked the specs and I found 225 45 on front and 245 40 on rear. That seams really weird to have a lower profile on back. Is this correct?
 
#3 ·
225 45 on front and 245 40 on rear is correct. The 45 and 40 is the Sidewall Aspect Ratio

Tire Rack Example - P225/50R16 91S

The 50 indicates that this tire size's sidewall height (from rim to tread) is 50% of its section width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall; the lower the number, the lower the sidewall. We know that this tire size's section width is 225mm and that its section height is 50% of 225mm. By converting the 225mm to inches (225 / 25.4 = 8.86") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 4.43". If this tire were a P225/70R16 size, our calculation would confirm that the size would result in a section height of 6.20", approximately a 1.8-inch taller sidewall.
 
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