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Originally Posted by bringsmewomen
by how much? Sorry for the stupid question. I don't know what the 245's really signify.
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OK, here's my basic understanding. in tire sizes, the numbers are in the format XXX/YY/RZZ
The first XXX number, in this case 235 or 245 is the width of the tire in milimeters. There are approximately 24mm to one inch (I think).
The second YY number, in this case 35 or maybe 40, is the profile of the tire. It is expressed as a percentage. In other words 235/35, means that the sidewall is 235mm x 35% = 82.25mm. 245/35 would be 85.75mm, so a difference of 3.5mm.
The final RZZ number is the size of the wheel/rim in inches that the tire fits, eg. R18, R19, etc.
So to summarize, the difference between 235 and 245 is as follows:
- The 245 is 10mm wider
- The 245 is 3.5mm taller
The result of this is that with a 245 you will have marginally better handling, but your speedometer/odometer will be off by at least 2mph, maybe 3mph. You also increase weight and rolling resistance, which decreases fuel economy. The tires also look different. I personally prefer the slightly leaner look of the 235 and 265. I think that fatter tires look better on muscle cars, like mustangs, camaros, etc. My advice, stick with 235 and 265.
Good luck...