The Center bore size on my stock 73 -5 lug 14 inch wheels looks to be around 2-3/4 inches. Anyone know what it the factory Center bore is officially? I understand they got larger in 74 to accommodate disc brakes. What Center bore would that be? Also what might be the hub diameter on the dic brake conversion kits? Thanks. I searched Center Bore but couldn’t find what I needed. I want to make sure the bore of any rims I buy can accommodate a future disc brake conversion set-up. Thanks for your patience. MD
The center bore on the stock 14-inch wheel is aprox 2.24 inches. When I installed disk brakes, I had to replace all five wheels with 15-inch wheels because my kit would not fit 14-inch wheels. The CSRP website where I got my kit two years ago now says they have a kit that fits 14-inch wheels. Check with your vendor to assure fit. http://www.discbrakeswap.com/Mustang Disc Brake Conversion Kits SWAP3.html
This is the only thing I can really add: The early cars (1970-1973) had the small hub. The later cars (1974-1977) had the larger hub. I have never ran across an aftermarket wheel that would ONLY fit the early size hubs. Seems all the manufacturers made them to fit the lager hub, which in effect, would fit both.
I can't comment on '73 up(but I will). Hub size increased across all lines in 1970. The '69 Boss 302 & 429, used 1970 sizes. Does not include '69½ Maverick. Those are four lug, so really does't make a difference. The original drum hubs on my Comet were larger than than disc brake hubs on my '69 428 Cobra. Same for '69 Torino discs(same as Cobra) now on Comet, those hubs are also smaller than '72. AFAIK bearings and spindle size are same '70-up, really no reason later '70s models should be larger.
I can say that the 14” wheels off of my 72 Cougar XR7 with discs would not fit on a 75 Maverick rear end. So at least for the Mustang and Cougar, 72 we’re still the smaller hole size too. - Matt
Correct me if I am wrong but did 6 cylinder Mavericks have four lug hubs and 8 cylinder Mavericks got five lug hubs? Was there a difference in the centre bore dimension of their wheels?
The 1981 Hollanders Interchange lists std five lug wheel used on '71/'77 Maverick/Comet as either 899A or 899B, use dependant on tire option. States interchangeable(I'd think if they'd screwed up, would have long been corrected). Difference is A rim width is 4½", while B width is 6"... The B wheel was also used on '71/'72/'73 Mustang/Cougar, plus all years Granada/Monarch.
Regarding the axles, all where 28 splined, regardless of 6 or 8 cylinders and all the Fords I have owned, axles that had 3 "holes" in the hub where smaller 2.42" and ones that had "rectangular" hole where 2.78" David
Just got a reply from the rep at Baer. The outer diameter of the rotor snout is 2.425 to 2.435 for the Baer 11” disc “classic” disc brake conversion. Therefore, the centre bore will not be an issue when doing the conversion. The photo of their system shows five lugs. Basically, the conversion mimics the original small hubs. Therefore, if you bought some nice 5 lug rims for your car, you could still use the same rims after the conversion. Also, the rep confirmed they are still selling the system. Www.Baer.com
And, speaking from experience, make sure your spare fits the new hubs, too. Never thought about it until I was on my way to Roundup one year and got a flat tire. Tow truck took me to "garage hell" where I spent 6 hours trying to get my tire fixed.
I put a '75 Maverick rear end in my '61 Falcon as it was only Maverick rear end I could find at the time and didn't realize they had changed the hub when disc brakes on the front became available. I wanted to use the set of Ford Styled Steel (14x6) wheels I already had, so I took 2 of the wheels to a machine shop and had the machined to the larger size hub. Maybe not the best option, but was at the time. Have not had any issues... I have since found an earlier Maverick rear end. I assume the axles are interchangeable with the only exception being the hub bore size as being discussed. Is that correct?
