hey guys, my 67 has the stock rims (14x5 1/2) and tires. I want to put 15x7's all around. Assuming my suspension is "okay", not new, but not bad, will I have any issues with larger wheels of this size?

 

There maybe fender well rubbing issues, the speedometer will no longer be accurate, the larger wheel size will make it read slower i think.

On the flip side you can run larger disk breaks if you plan to upgrade.

Gun

 

Thanks, I figured fender well rubbing might happen. sucks...

 

In the FAQ at the top of the classics page:

Tire and wheel fitment charts:

http://dodgestang.com/mustang.htm
http://www.allfordmustangs.com/Detailed/658.shtml

 

how can u make your speedometer accurate after changing the size fo your tires

 

I don’t know for sure but I would bet it would have to do with changing the gear ratio for the speedometer drive. This is a common problem so I bet there are lots of kits of some sort to recalibrate the speedometer.

Gun

P.S as for wheel rub your going to just have to test and find out if it is a problem, my guess is that at worse case you will have to fold the inner "lip" of the fender arc up so it does not touch the tire or it could cut the side wall.

 

Not to point out the overly obvious here....speed-o-meter is controlled by the outer diameter of the TIRE on an old mustang. Not the rim size. So if the stock mustang runs on tires that are roughly 25.5 inch in diameter a smart person puts a tire that is relatively close to this size on their new rims.

Like for example....my 255 40 17 tires are roughly 25.6 inches in diamter

 

Right, you could use a larger wheel with a thinner tire and still have the same outside diameter and no change to speed reading.
But then you risk loosing handling ability because the there is less sidewall to "soak" up sway and such. If the suspension is on the soft side (anti sway included) there maybe no issue.

The series of tire you plan to use should be something to consider as well

Gun

 

Huh?

Thicker sideways 'soften' your ride and offer significantly less 'handling' than a stiffer/shorter sidewall tire. The only thing the thicker sidewall gets you is the ability to 'disguise' worn out suspension compenents. IMO fF you want a 'cruising' car 60-70 series tires work just fine, if you like the occasional spirited drive 50-60 series, but if you like to take on ramps at 65 like I do 40-50 series offers some very strong selling points, the larger rim/shorter sidewall coupled with at least back to factory specs suspension with a few tweaks is needed.

 

I have heard that with tight suspension stiff sidewalls will cause a decrease in handling.
It makes sense too, with more flexible sidewalls the wheel is able to shift without distorting the griping surface because the sidewall flex will allow it, thus adsorbing some sway energy.

With ridged sidewalls much less sway can be adsorbed and therefore the energy is transferred directly to the griping surface.

This was what I was told and it seems logical.

Gun