696spd Posted May 10, 2011 Share Posted May 10, 2011 I have some Sport Edition A7 wheels 17x7.5 with 48 mm offset and can get an unreal deal on some 245/40/17 's . I have an 07 stock suspension with the saggy butt but maybe some Ralliteks in the future. Will these fit ?? Link to comment Share on other sites More sharing options...
W1CKED Posted May 10, 2011 Share Posted May 10, 2011 and it also depends on what kind and size of tire you want to run as well (and that can get messy). But to be on the safe side, here is the tire widths you can put on each rim: 195mm = 6.5", 7" and 7.5" 205mm = 6.5", 7" and 7.5" 215mm = 6.5", 7", 7.5" and 8" 225mm = 7", 7.5", and 8" 235mm = 8", 8.5", and 9" 245mm = 8", 8.5", and 9" 255mm = 8.5", 9", and 9.5" 265mm = 8.5", 9", and 9.5" 275mm = 9" and 9.5" 285mm = 9" and 9.5" Once you decide on the rim size, the tire width you want to run, here are your final tire choices. Note that not all tires are built the same way, so sometimes you'll find two different tire models with the same size (225/45/17), but one can fit on a 7" rim, while the other one will need a 7.5". You'll have to look around the manufacturers' specs on sectional width of the tire.. normally you want your rim width be no more than 1.5" less than the tire's sectional width. For example, if you have a 8" wide rim, your tire's sectional width shouldn't be more than 9.5" or you'll have to deal with the flex on the tire sidewalls. Most performance driving set ups are 1" difference (ie. a 8" wide rim with 9" wide tire). Below I listed for you by rim diameter of which I recommend running with some notes on each tire with notes to go along with them as well: and... 17 in. rims (for GTs 2005-on): 205/40/17 (only for SUPER FAST acceleration and torque; for autocrossing only, do not use for daily driving) 205/45/17 (only for FAST acceleration and torque; for autocrossing only , do not use for daily driving) 205/50/17 (good for snow rally) 215/45/17 (stock) 225/45/17 (good autocross performance tire size for gearing, more mph per gear) 235/40/17 (good autocross performance tire size for torque, more acceleration) 235/45/17 (tallest tire you could use under the GT due to possible suspension clearance issues, best used with an 8" wide wheel) 245/40/17 (good autocross performance tire size for traction, will need to have a flatter alignment to make use of the grip) 255/40/17 (maximum grip, good for track days, will need a 9" rim to make use of the contact patch and a good alignment as well). From: HERE Link to comment Share on other sites More sharing options...
696spd Posted May 10, 2011 Author Share Posted May 10, 2011 Thanks, so it looks like the tire will fit with stock suspension, but it's not the ideal rim size ...but should work? Link to comment Share on other sites More sharing options...
whitetiger Posted May 10, 2011 Share Posted May 10, 2011 for a 245 tire, a 8" minimum width rim is needed. Link to comment Share on other sites More sharing options...
richondo Posted May 14, 2011 Share Posted May 14, 2011 for a 245 tire, a 8" minimum width rim is needed. tons of mustang guys run 245s on a 7 inch pony wheel. heck, even a 255 not trying to offend, but don't scare him Link to comment Share on other sites More sharing options...
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