My car has 21" twin turbines in staggered config. 245/35-21 front, 265/35-21 rear. According to my math (I'll show my work below,) the rear tire is 0.5 inches taller than the front. This surprises me because I would have assumed the total height of the tires to be the same all the way around, with the rears simply being a little wider.
Now for the real problem. I'm planning to get a set of 19" wheels and tires for winter. The 19" tires will be the same height all the way around. If i'm putting a smaller total height tire on the rear from what the car came with, won't that cause issues with...something (distribution of power, stance of the car, front to rear alignment?)
Math:
1. Total height of 19" - 245/45-19=
a. .45*245 = 110.25mm <- height of sidewall in mm
b. 110.25 / 10 / ~2.45 = 4.3 inches <- this is the height of the sidewall in inches
c. 4.3 + 4.3 + 19 = 27.7 inches <- two sidewalls plus wheel size = total height of tire
2. Total height of rear 21" - 265/35-21=
a. .35*265 = 92.75mm
b. 92.75 / 10 / ~2.45 = 3.7 inches <- height of sidewall
c. 3.7 + 3.7 + 21 = 28.3 inches
28.3 - 27.7 = ~0.5 inches: This shows that the rear 21" is 0.5 inches taller than the 19"????
3. The fronts of the 21" (245/35-21) are 27.8 inches, using the same math, which is ~the same as the 19".
Now for the real problem. I'm planning to get a set of 19" wheels and tires for winter. The 19" tires will be the same height all the way around. If i'm putting a smaller total height tire on the rear from what the car came with, won't that cause issues with...something (distribution of power, stance of the car, front to rear alignment?)
Math:
1. Total height of 19" - 245/45-19=
a. .45*245 = 110.25mm <- height of sidewall in mm
b. 110.25 / 10 / ~2.45 = 4.3 inches <- this is the height of the sidewall in inches
c. 4.3 + 4.3 + 19 = 27.7 inches <- two sidewalls plus wheel size = total height of tire
2. Total height of rear 21" - 265/35-21=
a. .35*265 = 92.75mm
b. 92.75 / 10 / ~2.45 = 3.7 inches <- height of sidewall
c. 3.7 + 3.7 + 21 = 28.3 inches
28.3 - 27.7 = ~0.5 inches: This shows that the rear 21" is 0.5 inches taller than the 19"????
3. The fronts of the 21" (245/35-21) are 27.8 inches, using the same math, which is ~the same as the 19".