BostonVP

I am thinking about getting new sets of tire and rims. If i was to find the rims that fits my 1999 es300, does it matter on what tires I get for it? And if there are any other steps that will need to be?

BDSL

You want to keep the overall diameter the same. I believe tirerack.com has a calculator for it....

BostonVP

okay, that was easy enough, but whats the offset all about, is that for the alignment?

RXGS

iTrader: (2)

youre tire size should be 205/65/15. Unless you are changing the rims/ wheels of the car, do not worry about offset. You should get a v or h rated tire. This is a speed rating for the tire

Hayk

iTrader: (1)

He is planning to change the size of the rim. These are the general sizes that fit most rims. I know somebody who used 225/45/17's with no issues, but they're a little bit smaller than factory in overall diameter.

15" = 205/65/15
16" = 205/60/16
17" = 215/50/17 (best) or 225/45/17 (a little smaller)
18" = 215/45/18 (best) or 225/45/18 (a little larger)

Power6

There are some basics of wheel and tire fitment, you can buy a package from Tire Rack and they will make sure the rims and tires fit each other and your car. Or you can do a bit of research yourself about wheel and tire fitment there are a number of factors these links may help

https://www.rsracing.com/tech-wheel.html
http://www.tirerack.com/wheels/tech/...jsp?techid=95&