VectorZ

Good grief, is this a real post or a poor attempt at humor?

CaptSpike

Wow tough crowd. Ask a simple question that is answered in the first two replies and then the "I'm smarter than the world" posts start jumping in. Excuse me for not knowing. I hope you guys never have a question your not sure of the answer to. I'd be dumbfounded if I had to nominate one of the smart *** replies for A-hole of the year, though having seen a few other responses from brokemillwright he might get the nod, but it would be very close.
For those that answered appropriately thank you.

Deerchaser

Ignore the A holes and there is a bunch in here.

dougrkyle

What I find even funnier is the smart ***** comments are wrong. The diameter of a 18" and 20" are not the same. There close, but there is a reason why guys recalculate there speedo when changing tires... It isn't a true 100% difference between sidewall length and rim diameter.

bartb

God help us all.

techrep

iTrader: (1)

And ?

CiDhed

275/65-18 7.0in 16.0in 32.1in 100.8in 629 0.0%
275/55-20 6.0in 16.0in 31.9in 100.2in 632 -0.5%

.2 inch difference in diameter would not require a recal. Even if it was slightly more like the 265/60-18 which is 1.9 inches less overall you could still get off the highway and into a store to get a tire put on it. I'm pretty sure the spare is the 275/65-18 though.


Also, it's a good practice to walk around your car before driving it to visually check the tires and make sure no fluids are leaking. With every car having keyfobs it's also easy to do a quick light check outside of the car even if it doesn't show all of them. I thought that was taught in the dmv guide to do a walk around before operating the vehicle. It's been a while so maybe they don't have people do that anymore.

odd-6

You can have two different overall size tires on an axle as long as it is an open differential.

If you have a limited slip you would need to switch a tire from the front to the back axle and then put the spare on the front.

iplayloudly

Even if the outside diameter was smaller, I doubt it would hurt anything to run it temporarily. A lot of cars come with little donut spare tires, and the outside diameter is usually smaller than the other tires.

Fasttimez

Let me know how your ABS likes running 2 different size diameter tires on the same axle bud.....with 4 wheel ABS standard, the difference in wheel speed would have your ABS engaging non stop, open diff or not. I'm not talking about slight differences, I mean having a 32" & a 31" on the same axle, if thats what you meant.