Posted: Sun Oct 10, 2004 9:54 pm Post subject: Tire size question
Hello all i have a question about tires for a 97 acura cl30 i have 205-55r16 on my car and i want to know if i put 225-50r16 on my car will my speedometer be off know or are they equivalent because of the with size??
You can calculate the overall wheel diameter very easily. The first number, 205, is the width of the tire in millimeters. The second is the height of the sidewall as a percentage of the tire width. For example a 55 series tire has a sidewall height of 55 percent of the tire width. The third number is the size of rim that the tire will fit on. So... to find the overall diameter of a tire, in your case, take 55% of 205mm = 112.75mm. Multiply 112.75 x 2 to account for the sidewalls, and add the diameter of the rim (16 inches). 112.75 x 2 = 225.5mm. Convert millimeters to inches, 225.5mm/25.4 = 8.88 inches. 8.88 inches(total sidewall height) + 16 inches (rim diameter), = 24.88 inches. This is the total diameter of your existing tire. If you change to a 225/50, the diameter will be 24.86 inches. This will not affect your speedometer. Why do you want 225 tires on your car? You should try getting some 17" wheels with a lower profile tire. It will look much better than having a wide tire with a tall sidewall.
If you increase rim size, you should decrease the sidewall height to compensate for the larger wheel. In your case I recommend a 215/45/17 tire with a 17" rim. This would make the diameter 24.6" which is less than 1/8" difference from your stock tire. This will have minimal affect on your speedo if at all and the low profile tire will look nice on your car.
There are a couple important things to thinks about when you are choosing a rim. Acuras (not sure if this applies to all models) have high offset stock wheels. This means that if you get a new wheel, which will most likely have a lower offset, it may stick out a little which looks like crap.
Be sure to get a wheel with:
the highest offset possible (mid to high 40's),
the narrowest width (17x7, 17x7.5)
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
