I'm running  steel 16x7's with 215x55-16 tires in front. 225X55-16 in back.  Wheels have 4.25bs.  Brakes are 12.19 4 piston Wilwoods.  I have about  1/16" clearance between the rim and the edge of the caliper.  I barely made it.  Fender edges are bent up for final clearance.  But I also have 1" lowered GT springs.

With 17's you can go to 4.5bs.  1.25 spacers are a lot, maybe too much. 

I also have a set of 87 Lincoln Mk VII aluminum wheels that I have used on occasion.  16x7" w 5"bs.  I can get them to fit with a 1/2" + 1/16" spacer.

Last edited by lowercasesteve (8/19/2020 11:01 PM)

I would strongly consider going to 17", only because there is a much bigger tire availability and at better prices. Plus if you ever decided to make any brake changes you would be set.

6sally6 wrote:

I like the "old-skool look" of 15's or 16's............17's make the 65-66's look like Hot Wheel Cars of the 80's IMHO
Too much rim and not enough tarz. 16's are just about perfect look.
Do-it-stop-good?.........Do you need to stop-gooder?
I've seen how you drive .....you don't tailgate......you watch for the texting-idiots....you don't drive excessive speeds (you're a cop for godsake!!)
My opinion..........
6sally6

Sally,  I'm with you on that..15/16's look much better than 17's IMHO.  17's do not have enough sidewall.  the proportions are off.  I know that much of the hot rod world wants bigger and bigger wheels.  and those 45 aspect ratio tires are much rougher on the ride - not enough side wall for extra spring. 
 

I agree that the 65-66 (All classic Mustangs) look better with 15's, I love the look of Magnum 500's and BFG T/A's letters out. I just find it harder and harder to find decent tires that look good for a decent price in the 15's and 16's. The options are endless in the 17's. With all that said if 15's would fit over my brakes, I would still have them and just pay the insane price for the BFG's. 
We all love seeing new wheel set-ups, so let know what you pick with photos.
Good Luck

I'm running the torque thrust II 17x7 in the front 17x 8 in the back ( cant remember the back spacing) 225/45/17 front 245/45/17 in the back no rubbing but I do have me fender lips rolled.

And a nud-'in.........
black paint is yo friend butt it will look sorta like these shots!


photo uploader

WONDER WHAT 16 I COULD FIT UNDER THERE.

Yup.

First - You can run a 16x8 in the rear.  There is plenty of room, mostly in the inside.  I would go with 4.75 bs in the rear, but you have to try it out first.  Someone else here may be able to help you as I am running 7" rears.

As to the front - I have Wilwood 12.19" dual piston calipers in the front.  The wheels are steel.  4.25bs and absolutely no room for less.  I also have the Arning drop, rolled lips, and 1" lower GT springs from Mustangs Plus.

Assuming you have disk brakes, anything smaller than mine will fit just fine.

Last edited by lowercasesteve (9/02/2020 10:44 PM)

OK NOW I CANT FIND ANYBODY THAT SELLS ANY 16X7 WITH 4.25 BACK SPACING TORQUE THRUST WHEELS OR 16X8 WITH 4.50 BACK SPACING. ….I WOULD PROBALY SETTLE FOR SOME 16X7 WITH 4.25 ALL AROUND ….JUST KINDA WANTED THE 16X8 ON REARWITH FOR MY 225X55X16 TIRES.

YALL GIVE ME SOME SOURCES OF WHEELS WITH THESE SPECS....I MAY HAVE TO GO WITH A DIFFERNT STYLE BUT I WANNA STAY WITH THE 16'S

HAS ANYBODY SEEN A SUPPLIER FOR THE 16X7 WITH 4.25 BACK SPACE OR MAYBE A 16X7 WITH 4.50 BACK SPACE??....SEEMS LIKE ALL I SEE IS 4.00 BACK SPACE.

Legendary Wheels are available with 4.25 BS in a 7" wheel.
I need to find out if they clear Cobra calipers though.