DRP967
03-24-2011, 08:10 AM
Does changing the wheel/tire size to a non stock circumference/width affect the motor in a negative way? Allow me to elaborate, my EP3 is a 2005 model. As you all know the stock tire size is 205/55/16. Not too long ago I swapped wheels and tires and now my tire size is 215/45/17. Now I know the car's wheels and tires were "upsized" and according to the Miata tire size calculator here are my specs:
stock tire diameter: 24.9in
new tire diameter: 24.6in
stock tire circumference: 78.2in
new tire circumference: 77.3in
stock tire revs per mile: 811
new tire revs per mile: 819
*A difference of -1.0%
Now here are my questions, my revs per mile has increased from 811 to 819. Does that mean my motor is working harder than normal? Also since my revs per mile has increased does that mean my car is racking up miles faster than the norm? So what happens when people go "wide/aggressive" do they take note of all this or simply ignore it? Shouldn't one have the speedo recalibrated for the new tire size?
stock tire diameter: 24.9in
new tire diameter: 24.6in
stock tire circumference: 78.2in
new tire circumference: 77.3in
stock tire revs per mile: 811
new tire revs per mile: 819
*A difference of -1.0%
Now here are my questions, my revs per mile has increased from 811 to 819. Does that mean my motor is working harder than normal? Also since my revs per mile has increased does that mean my car is racking up miles faster than the norm? So what happens when people go "wide/aggressive" do they take note of all this or simply ignore it? Shouldn't one have the speedo recalibrated for the new tire size?