17's or 18's on a 66 - Page 2 - Vintage Mustang Forums

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post #16 of 32 (permalink) Old 04-20-2017, 08:54 AM
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Just for reference I'm currently running 17x8" (4.5"BS) with 235/35/17s and a 1" spacer in the front with very little balljoint clearance and very little clearance with the rolled fenders. 17x8" (4.5"BS) with 255/30/17s in the back. Before I did the 8.8 swap I had to run a 1" spacer in the back. With the 8.8 I have about 1 1/2" of clearance on the inside of the wheel and almost no clearance on the outside with rolled fenders. I've read that with the stock 8" rear and the poor mans mini tub you can run up to a 17x8" (4.5"BS) with 275s, but I can't confirm that for myself.

1966 Mustang Coupe - GTS Blue
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post #17 of 32 (permalink) Old 04-20-2017, 10:18 AM
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17x8 Hurst Dazzlers with 5.67 backspace with 235/45's on all 4 corners. My car runs a wider 9" from a '67, with Street or Track coilover suspension and willwood brakes that widen the track width so no spacers on this car, no rolled fenders and no tire rub so far.
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post #18 of 32 (permalink) Old 04-20-2017, 10:56 AM
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17x8 Hurst Dazzlers with 5.67 backspace with 235/45's on all 4 corners. My car runs a wider 9" from a '67, with Street or Track coilover suspension and willwood brakes that widen the track width so no spacers on this car, no rolled fenders and no tire rub so far.
Not to hijack the thread, but how do you like the street and track setup? I'm trying to figure out which system I want to go with. As of now I'm almost certain I'll got with a MII setup since I can buy the whole front clip including the welded subframe (my front subframe really needs to be replaced), but I'm open to a coilover setup like you have.

1966 Mustang Coupe - GTS Blue
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GETTING TORN DOWN FOR FULL BUILD

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post #19 of 32 (permalink) Old 04-20-2017, 01:48 PM
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Originally Posted by ModStang View Post
Just for reference I'm currently running 17x8" (4.5"BS) with 235/35/17s and a 1" spacer in the front with very little balljoint clearance and very little clearance with the rolled fenders. 17x8" (4.5"BS) with 255/30/17s in the back. Before I did the 8.8 swap I had to run a 1" spacer in the back. With the 8.8 I have about 1 1/2" of clearance on the inside of the wheel and almost no clearance on the outside with rolled fenders. I've read that with the stock 8" rear and the poor mans mini tub you can run up to a 17x8" (4.5"BS) with 275s, but I can't confirm that for myself.
Not to sound mean....but go check your wheels again. You are not running a 17x8 wheel with 4.5bs AND a 1 inch spacer on the front because a 17x8 wheel with 3.5 inch backspacing would stick out significantly. Most likely you are running a late model offset wheel WITH a one inch spacer which adjusts the BS TO 4.5 and on edit....it appears in your sig pic to be late model wheels.....which would have been 5.5 or so backspacing which is why you have the spacer in the front. AND why you were able to lose the spacer when you added the wider 8.8 rear setup



Here is my POS with 245 40 17 front and 255 40 17 rear


Here it is again with 235 45 17 (they stopped making the 245s I had before and this was the only size I could get, plus the smaller footprint helped with the manual steering and I wasn't really in need of that much tire up front) and 255 40 17 rear


Here is again with 235 40 17 (they were sold out of 45s when I needed new tires ) front and 255 40 17 rear


Here is again with 235 45 17 front and 275 40 17 rear


All using 17x8 4.75BS wheels and I run -1.5 camber in the front in all photos. Fender lips in the front are not rolled. Lips in the rear are. The 275 40 tires didn't work too well for me in anything other than a straight line with my 5 leaf mid eye springs but after I upgrade and put in a watts and a 3 link I could run them anywhere/anytime if i wanted to. AKA the 275s are a tight fit on a lowered mustang and a rear centering device helps to have them not rub on bouncey turns

Nick
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Last edited by dodgestang; 04-20-2017 at 01:58 PM.
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post #20 of 32 (permalink) Old 04-20-2017, 01:51 PM
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Originally Posted by carguytroy View Post
The brake set up I decided to go with says that I may have to run 18's on my 66. Says some 17's may fit but may have to go 18. I have pretty well decided on Coy's C-67's machined wheels, but I'm wondering if they will even fit. They show 18x8 with 4 3/4 backspace and 18x9 with 5.5 backspace. Any insight?
18x8 4.75 BS should be ok for you front and back. Tire profiles will need to be something around 235 40 18 which will keep you close to the 26 inch tall magic number without going over.

Nick
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post #21 of 32 (permalink) Old 04-20-2017, 04:36 PM
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Not to sound mean....but go check your wheels again. You are not running a 17x8 wheel with 4.5bs AND a 1 inch spacer on the front because a 17x8 wheel with 3.5 inch backspacing would stick out significantly. Most likely you are running a late model offset wheel WITH a one inch spacer which adjusts the BS TO 4.5 and on edit....it appears in your sig pic to be late model wheels.....which would have been 5.5 or so backspacing which is why you have the spacer in the front. AND why you were able to lose the spacer when you added the wider 8.8 rear setup
Lol yup, you're right. I forgot I switched the wheels over. New wheels are 5.5" BS. Good catch.

And the new rear end is about 1 1/4" (from what I can remember) wider on each side. So my wheels now site 1/4" closer to the quarter panel than they did with the 8" and 1" spacer.

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post #22 of 32 (permalink) Old 04-20-2017, 06:56 PM
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I wouldn't go that far- I had 17x8 on the front of my stock '65 and they rubbed pretty hard- 235/45r17 tires (if I recall correctly) on the wheels Coy's said were a direct fit. I dropped back to a 17-7 with the same tire and they work perfect.
It's a wonder they rubbed that bad. 17x8 with 4.75 backspacing fit well on mine. And if you add some camber you can lower the car a bit. My guards aren't rolled either. I have a few friends with 8's in 4.75 and they fit also.
Were they rubbing on hard turns?
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post #23 of 32 (permalink) Old 04-20-2017, 07:00 PM
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He's right. 4.5" backspacing will need a 1" spacer in the front to clear the ball joints with a 17x8" wheel. .
I don't understand this. If a 17x8 with a 4.75bp clears the ball joint, wouldn't a 4.5bp clear no dramas as it sits a 1/4" further out?
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post #24 of 32 (permalink) Old 04-20-2017, 09:57 PM
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I don't understand this. If a 17x8 with a 4.75bp clears the ball joint, wouldn't a 4.5bp clear no dramas as it sits a 1/4" further out?
Yes but it puts the wheel/tire closer to the fender

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post #25 of 32 (permalink) Old 04-20-2017, 10:19 PM
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I don't understand this. If a 17x8 with a 4.75bp clears the ball joint, wouldn't a 4.5bp clear no dramas as it sits a 1/4" further out?
Yes. The error was pointed out elsewhere in this thread. He was running a 17x8 5.5 wheel which would hit the ball joint and used a 1 inch spacer to push it out to 4.5 inch BS

Nick
1965 Fastback 410c AOD - DT
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post #26 of 32 (permalink) Old 04-20-2017, 10:57 PM
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the 8" on my fronts are with full TCP coilovers-

the rear 9" are running 275's.. rolled lips- mini tub- 8.8" narrowed- with 9" ends and a 4 link and coilovers--

my car is SUPER low- doesnt rub- i do have room to possibly run 295's with custom wheels

most 65-66 ive seen can not take larger than 255 - leaf spring interference-- or the car has to sit so high the tire can sit out past the wheel lip- that doesnt count ..

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post #27 of 32 (permalink) Old 04-20-2017, 11:55 PM
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Yes. The error was pointed out elsewhere in this thread. He was running a 17x8 5.5 wheel which would hit the ball joint and used a 1 inch spacer to push it out to 4.5 inch BS
Yeah no dramas missed that part
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post #28 of 32 (permalink) Old 04-21-2017, 07:48 AM
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Originally Posted by fonebooth View Post
the 8" on my fronts are with full TCP coilovers-

the rear 9" are running 275's.. rolled lips- mini tub- 8.8" narrowed- with 9" ends and a 4 link and coilovers--

my car is SUPER low- doesnt rub- i do have room to possibly run 295's with custom wheels

most 65-66 ive seen can not take larger than 255 - leaf spring interference-- or the car has to sit so high the tire can sit out past the wheel lip- that doesnt count ..
Yeah I have 255s in the back and I might be able to run a 265 but it'd be wicked tight. I'm pretty much outta room on both sides of the tire as it is.

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post #29 of 32 (permalink) Old 04-21-2017, 01:46 PM
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I have 275's on a 18X9.5" in the rear and 235/40 on a 18X8 in the front

1965 Mustang Fastback- 349 clutch killer, 70MM turbo,FiTech Go EFI 8, TMI Sport XR interior,Centerforce DIYAD,18" TSW, Master Power big brakes
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post #30 of 32 (permalink) Old 04-23-2017, 11:31 PM Thread Starter
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18x8 4.75 BS should be ok for you front and back. Tire profiles will need to be something around 235 40 18 which will keep you close to the 26 inch tall magic number without going over.
Cool! I'm using a 9" rear out of a 57-58 Ford. Will that affect anything?

Troy Arave
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