Tire size question.

[Rob Armstrong]

So I bought some used tires. Sight unseen.
215/55/17 two different makes.
They are about 1in different in circumference and the taller one is also 1/2in wider.
Now the guy that sold them says it will be fine but I am worried.
Should I be?
I haven't mounted them yet but I don't think that will make any diff on size.

[Bennji Favelle]

Is your car lowered? Fenders rolled?

What is your concern? Fitment, or Speedometer accuracy?

[Rob Armstrong]

Concern is frying the viscous coupler.

[Jason Swan]

Wider?  Not a problem. Taller?  Problem. I wouldn't run them.

[Bryan Hoytema]

Size does matter ...

[CamWeiss]

Problem, for sure.

Rolling circumference needs to be a lot closer than 1" apart!

If you've already taken them, I guess you can either see if any FWD guys here want them or pop them back out on CL.

[Rob Armstrong]

Yea that's what I figured.
Just wanted to know forsure before I tell the guy he doesn't know what he's talking about.

[Ryan Singh]

I've heard wider also matters because the amount of surface area in contact with the road changes the overall dimensions when you take into consideration that it's displacing air and the tire will stretch. Very minutely however, wider does make a diff.

[Eddie ly]

I plan on running 255 rear and 225 in front, as long as the diameter/rpm(rotation per mile) are the same or at least within 3-5 rpm of each other thing should be fine.

[Jason Harwood]

I plan on running 255 rear and 225 in front, as long as the diameter/rpm(rotation per mile) are the same or at least within 3-5 rpm of each other thing should be fine.

I would not recommend.