That's the ratio of the tire's height to it's width - at 50 (%) , they're equal.
Depending on which trim level it is: 205/60-16 Or 225/50-17 the rims and tires removed from the Mazda rx8 are 225/50-17
It can go 12 times.
The front and rear tire sizes for the NSX changed three times during its run from 1991-2005: 1991-1993 F 205/50/15 R 225/50/16 1994-2001 F 215/45/16 R 245/40/17 2002-2005 F 215/40/17 R 255/40/17
Listed on the driver's door post. It is 225/50-17
As a fraction the answer is 38.25 / 225 38.25 / 225 = 0.17 As a percentage the answer is (.17)*100 = 17%
225
You can install 235/50-17 or 215/60-17 and that is about the only sizes you should use.
The least common multiple of 225 , 50 = 450
Yes, you can use a 225-45-18 tires instead of 225-50-18 tires.
Of course you can but, your speedometer will read 58.9 at a true 60 mph. You will also have slightly less power. My advice is to stick with the OEM size tire.
17 with 4 remainder 225 - 4 = 221 = 13 x 17
You have not given the whole tire ID number. -It's essential.For instance, you could replace a 235/65 R 15 with a 225/65 R 15.- You could NOT replace a 235/70 R 15 with a 225/50 R 15.That second set of digits, the profile #, IS important and you should not expect a good answer without giving ALL the pertinent facts