DylanFan

Last week I bought a one owner 2000 Crimson Red Mustang, V6 with auto/overdrive Convertible with 112,000 miles. It came with the stock wheels and 205/60R15 tires. Today while coming home from getting a nw battery (it had the original) and an alignment my wife spotted some wheels and tires for sale in someone's front yard. We stopped and looked at them.

They were 16" Eagle Alloy rims with Goodyear Assurance tires with a direction tread pattern size 225/60R16. The rims have a satin finish and look remarkly like Mustang Bullitt wheels but not the same. It seems that every Mustang around here has Bullitt wheels so it is nice to be differant. Oh, I gave $300 for the rims/wheels and the guy who sold them said the tires had about 3,000 miles on them and that he had paid over $800 for the rims/tires with his discount from the tire store where he works.

The old tires measured about 24" in diameter while the new tires measure about 26" in diameter. The new rims/tires fit fine and do not rub when turning from lock to lock. Finally we get to the question! What kind of difference will the bigger rims/tires have on my speedometer or gas mileage? Or is the difference not large enough to cause problems?

Thanks in advance

Steve

MustangChris04

the difference is not large enough to cause problems

I_AV8_4U

This might help you determine the percent off your speedo is.
Good luck.
Troy
http://www.miata.net/garage/tirecalc.html

DylanFan

Thanks for the link. It showed that with the new rims/tires my speedometer will read 4.5% low. When the speedometer shows 60mph I would actually be traveling at 62.7 mph. That's good to know.

tictac

So how do we know what our stock tires were?

I_AV8_4U

Sometimes you can find that at tire stores...try tirerack.com, or discount tire's web site. Should be an area where you input your vehicle's year and model, and it spits out the original tire size.
Good luck.
Troy