Topic:Plus sizing
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T O P I C     R E V I E W
Mike_MI'm looking at plus sizing the tires on my 96 Caravan from standard Goodyear 205/75R14 to Michelin X-One 215/70R14.

Just wondering what effect this minor plus sizing would have on the speedometer and odometer readings? Will the speedometer speed reading actually be slower of faster than actual speed?


RamX75You're actaully thinking of going to a SMALLER diameter tire by doing that. It's only 3/10 of an inch shorter overall height, but almost 1/2" wider. I don't think you'll notice any effects from the difference. Good luck.
CraigThere will be less than a 1% difference in your speedo reading. When your speedo says 65 MPH, you will actually only be going 64.35 MPH. Most speedos are no more accurate than that anyway. Go for it! You will really like the X-ones.
I did the exact replacement on a realatives '99 caravan (not grand) about a year ago. The results were excellent. Better ride, increased road feel and handling slightly and eliminated some of the wondering and sway they were expiriencing. Unless you want to look at a plus 1 or 2 and go with 15" or 16" wheel tire package I would recommend it.
GregThis site is great for comparisons when considering plus sizing -

Craig, how did you calculate the true MPH at a given speedometer reading from the % diff in tire diameter?

CraigGreg, I do my calculations at

I will try your site as well. Thanks.

ookiePlease keep in mind that when you don't use the stock tire sizes, you are also messing with the computer used to calulate the anti-lock braking mechanisms for you car. So, if you're speedo is off 3%, the computer's calcs will be off as well.

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