I just got some 18 inch rims for my mazda 6i already i can hear the back tires rubbing i was just wondering i anyone had the same problem or if its jsut my 6 if anybody has any suggestions let me no

 

well all I can say is you better add some horses to your car, because your acceleration will suffer with 18'

 

chances are you are gonna have to roll your fenders. i know that every person that has increased the size of the wheel has had to do so. what i would do is get a wider tire and lower the car. the bigger the wheel, the heavier it is as well (in most cases) so you lose a little power!

 

What's the offset on the wheels?

 

why do u guyz insist on beliving wheel size makes u lose power? not tru at all..........unless u go over ur stock radius of tire..........meaning the stock 6 comes with 17's already. with i belive 45 or 50 thickness tires........if u step up one size all u do is make the tire thinner...making the outer radius still pretty much the same. and even then if u go over the stock radius...u dont lose power.......u lose slightly on acceleration due to the larger rotating mass. hard to explain but u dont lose power. now if u went 20's u would definatley lose on accel, but still would only be a little

 

The larger diameter the wheel the heavier it is. (For the most part...some ultra expensive large dia wheels are also fairly light.)

1 lb of rotating mass is the equivalent of 7-10 lbs of dead mass on a vehicle.

Braking distances/wear are also increased with larger diameter wheels due to the increased weight.

You're right, you don't lose power, you just accelerate slower.

Now if the 18" wheels you are looking at are the same weight as the 17" wheels that came stock, then there would be no performance decrease.

 

...usually.

the fact that you are pushing the weight out a bit is the same as adding weight pretty much. i think tq is the thing that you notice, not power...it's the initial get-up and go that suffers typically. for those that daily drive the car, i really wouldn't worry about it...it's not that bad.

but you will need to roll the fenders for sure

 

how did you paint your calipers and what kind of paint did you use

 

tire circumference changes the gear ratio of your car thus affecting acceleration and top speed!

 

a little is still a little. I wouldn't sacrifice 1 horsepower for looks!