larger tires

Hi all... i was wonering if putting larger tires on my 2003 f250 extended cab would be feesable... without chaging the 16" rim i would just
like to put a bigger (higher) tire...
Was wondering if this would change things like speedometer and crap all that much
Kenny
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[This followup was posted to alt.autos.ford and a copy was sent to the cited author.]
@optonline.net says...

Larger circumference (the distance around the tire) would make you go faster and farther than what the speedomter/odometer says. It may also reduce your acceleration a bit since it's like running a higher gear. Typically, you want to stay within +/- 5%. If it's an electronic speedo (very common, even if the gauge itself is analog) there are boxes that you hook in-line with the VSS (Vehicle Speed Sensor) that can adjust for the difference. Also, a taller tire will raise your center of gravity, increasing your chance of a rollover in an accident.
Here's one web site that calculates out tire size differences, at least for P-metric type sizes. For some of the truck inch-based sizes, there are probably truck-oriented sites. http://www.miata.net/garage/tirecalc.html
A few others a Google search found: http://www.4lo.com/4LoCalc.htm http://pw1.netcom.com/~sgalaba/tiresize.htm
Finally, check the tire manufacturer's web sites. They often have the exact circumference/diameters for a particular tire. There can be a bit of variation between calculated and actual circumference/diameter.
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