tire size question

[thetrousertrout]

thinking about getting some nice rims for the civic (4x100), but want to do away with the stock 13" steelies i got now.
Stock tire size is 175/70R13. If I wanted to put 16" rims on there, what would i have to change the second number to so that it won't throw off my speedo too much? If someone could explain what each increment of the first 2 numbers means in cm or inches, i could probably figgure out the rest.

thanks,
Chris.

[tabouli]

The first number regards the width of the tire at its widest point. It's measured in millimeters. The second number regards the height of the sidewall, but the number is a percent of your width.
So for your tires, your sidewall height is going to be 70% of 175 millimeters.

The "second number" for your 16 inch wheels is going to be dependant on the tire size you choose as a "first number". Hope that helps. Someone correct me if I'm mistaken

[xrayvsn]

For the Civic with 16" rims, you should mount 205/45 16 tires. This will keep your speedo within a percent of the original 13" rims/tires.

[Lo)2enz0]

go with something like 195/50/16 on your 16's

a 70 side wall is HUGE.

[twiggster]

they do make a 205 40 r 16 might be a little closer to that 13 inch wheel and tire

[rc2002]

205/40/16 is the correct tire size if you have an EF civic. 205/45/16 if you have 92-2000.