I got a heck of a deal on some 17" bullits for my car from another 2005 mustang owner. I read somewhere that the 17" bullits and tires will cause the speedo and such to be off, is it true?

Edit: If this is in the wrong forum or has been asked a million times my apologies!

 

This might help:

http://gs.tolan-hoechst.com/tirecalc.htm

 

yes you will be speeding when doing the posted limit, adjust for it

 

Depends on what the stock tire/rim and bullitt 235 ratio is.

Just check on the tire calc site.

If its off, not only is your speedo, but your mileage will be too

 

well, if someone could tell me the tire size of a stock tire with factory 17" bullits that would help alot, thanks.

 

You'll be making the rim bigger and the sidwall skinnier so you won't affect your speedo. Unless you left some fatties on there.
235/55/17 is stock, but you may go for some 255/50/17 for a better look (same overall diameter only wider so speedo will remain ok)

 

What's the stock size on an '05 V6?

 

215 mm wide
65% aspect ratio
16" diameter rims

 

215*.65/25.4*2+16=27.0"

Doing the calculations. You need either the stock 17" size (235/55/17) or 255/50/17's just like ManEHawke said.

235/55/17's: 235*.55/25.4*2+17=27.2"

255/50/17's: 255*.50/25.4*2+17=27.0"