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Old 05-10-2007   #1 (permalink)
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Default What does wheel size affect?

I've been planning on replacing my stock wheels with some shiny aftermarket rims, but I don't know what size to go for. 18" at the very least, but what are some of the consequences of going with 20"s? Things like tire wear, ride comfort, et cetera. I also intend to lower the car about 1.5 inches if it makes any difference.
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Old 05-10-2007   #2 (permalink)
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I've been planning on replacing my stock wheels with some shiny aftermarket rims, but I don't know what size to go for. 18" at the very least, but what are some of the consequences of going with 20"s? Things like tire wear, ride comfort, et cetera. I also intend to lower the car about 1.5 inches if it makes any difference.
20" will suck all the torque out of the engine. They weigh entirely too much.

your suspension will no tbe able to cope with thtat much weight either. 17" are perfect, 18s are almost too big.
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Old 05-10-2007   #3 (permalink)
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to take a page from KS,

the bigger the wheel = the greater the rotational mass = more torque to spin the wheels = slower acceleration & less MPG
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Old 05-10-2007   #4 (permalink)
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actually... you guys are ALMOST entirely wrong. getting a bigger wheel will cause a few things to happen.

1. your speedometer will be off. it will read slower than the actually speed you are going. so if you are going 40. your speedo will actually read like 35 or something (depending on how big of a difference the wheel size is from the original)
2. you will accelerate slower... WAY slower with a 20" rim (which honestly i think is kinda dumb on a mustang unless its an 05 or up... for some reason they look good on those cars)
3. you actually will notice an increase in gas mileage.. getting bigger wheels is equivalent to getting a smaller gears size. by smaller i mean going from like a 3.55 to a 3.27 or somthing. you will notice a loss in acceleration/torque being applied to the rear wheels.

its up to you though. just be prepared to fix your speedometer. and fixing your speedometer is an absolute must because it throws your odometer off as well.
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Old 05-10-2007   #5 (permalink)
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edit** what does your suspension have to do with the weight of your wheels KS? the suspension rides over the wheels not under them. the weight of your car affects the suspension not the weight of your wheels
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Old 05-10-2007   #6 (permalink)
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actually... you guys are ALMOST entirely wrong. getting a bigger wheel will cause a few things to happen.

1. your speedometer will be off. it will read slower than the actually speed you are going. so if you are going 40. your speedo will actually read like 35 or something (depending on how big of a difference the wheel size is from the original)
2. you will accelerate slower... WAY slower with a 20" rim (which honestly i think is kinda dumb on a mustang unless its an 05 or up... for some reason they look good on those cars)
3. you actually will notice an increase in gas mileage.. getting bigger wheels is equivalent to getting a smaller gears size. by smaller i mean going from like a 3.55 to a 3.27 or somthing. you will notice a loss in acceleration/torque being applied to the rear wheels.

its up to you though. just be prepared to fix your speedometer. and fixing your speedometer is an absolute must because it throws your odometer off as well.
re: MPG, that would be the case on the highway, but the engine would have to work harder in the city. I should also point out, that would only apply to steady state velocity with no acceleration or ascensions & little wind resistance, because of the rotational mass. The rotational mass of the rear gear is SIGNIFICANTLY less than that of a wheel/tire combo.

going to a numerically higher gear CAN get you better city mpg numbers.
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Old 05-10-2007   #7 (permalink)
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edit** what does your suspension have to do with the weight of your wheels KS? the suspension rides over the wheels not under them. the weight of your car affects the suspension not the weight of your wheels
Think about that and come back later, before we have to go through 27 pages.
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Old 05-10-2007   #8 (permalink)
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ahhhh yes... because the rebound right? is that what you mean?
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Old 05-10-2007   #9 (permalink)
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haha... and i think it was like 30 pages actually
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Old 05-10-2007   #10 (permalink)
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ahhhh yes... because the rebound right? is that what you mean?

There you go! I knew you had it in ya!
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Old 05-10-2007   #11 (permalink)
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yes i forgot that is a huge factor... with a 20" rim that will be extremely noticeable. an 18 shouldnt be TOO bad though. you can always get some adjustable rebound dampeners and other stuff too that will help
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Old 05-10-2007   #12 (permalink)
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yes i forgot that is a huge factor... with a 20" rim that will be extremely noticeable. an 18 shouldnt be TOO bad though. you can always get some adjustable rebound dampeners and other stuff too that will help
yeah, most of them weren't designed for a wheel that heavy. Springs weren't either.
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Old 05-10-2007   #13 (permalink)
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Quote:
Originally Posted by Cobra9898 View Post
actually... you guys are ALMOST entirely wrong. getting a bigger wheel will cause a few things to happen.

1. your speedometer will be off. it will read slower than the actually speed you are going. so if you are going 40. your speedo will actually read like 35 or something (depending on how big of a difference the wheel size is from the original)
2. you will accelerate slower... WAY slower with a 20" rim (which honestly i think is kinda dumb on a mustang unless its an 05 or up... for some reason they look good on those cars)
3. you actually will notice an increase in gas mileage.. getting bigger wheels is equivalent to getting a smaller gears size. by smaller i mean going from like a 3.55 to a 3.27 or somthing. you will notice a loss in acceleration/torque being applied to the rear wheels.

its up to you though. just be prepared to fix your speedometer. and fixing your speedometer is an absolute must because it throws your odometer off as well.
dont forget wear out your brakes faster, and may affect automatic trans shift points.
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Old 05-10-2007   #14 (permalink)
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how would that make your brakes wear faster???? i think getting bigger tires would make them wear slower if anything
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Old 05-10-2007   #15 (permalink)
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how would that make your brakes wear faster???? i think getting bigger tires would make them wear slower if anything
Think about newton's law and leverage against the brakes. through the axis of the wheel.
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