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Abyssinian of AX
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Discussion Starter #1 (Edited)
Hello, my pepes :)

The Mods have decided that a separate section within The Classifieds should be dedicated just for tires and wheels. Due to the many differences and a few similarities between model years, I thought it a good idea to write up a fitment guide. This will answer most, but certainly not all, of those questions arrising from the shopping of wheels/tires found in this section. My hope is to first and foremost avoid buying tires and wheels that will NOT fit your ride, but also might bring you un-intended consequences from a less than ideal fitment. My focus here is to stick with clearance and proper fitment ONLY, but other issues of tires and wheels will come into pay, as we move forward.

MANY things are in play with fitment of wheels/tires that are not OEM dimensions:
Off-set/ back-space ~ This is the relative position of the mounting face of the wheel and the location of the hub or axle on your car. A POSITIVE off-set, means that most of the wheels width, is going toward the underside of the car.
Bolt pattern
Wheel width
Wheel diameter
Center bore diameter
Lug-nut seat style
Caliper clearance
Tire diameter
Center caps and their diameter/fitment
Thickness of wheel flange or pad
many others not mentioned...



1 BC ~ 1963:

1962 Ford Mustang concept car

This was a down period in the development of the Mustang, so very little information is available. Suffice to say, you don't likely have a model produced in one of these years, as they are VERY rare. Most members of MM's are quite cheap and would probably not invest in one of the pre-development year Mustangs, so we will skip past them and right to the more prevalent years.

1964~1973:
Bolt pattern ~ 4x4.25" or 5x4.5"
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~ 25"
Widest wheel with little/no modifications needed (front) ~ unsure
Widest wheel with little/no modifications needed (rear) ~ unsure

1974~1978:
Bolt pattern ~ 4x4.25"
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~
Widest wheel with little/no modifications needed (front) ~ unsure
Widest wheel with little/no modifications needed (rear) ~ unsure


1979~1993:
Bolt pattern ~ 4x4.25" (except '93 Cobra)
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~
Widest wheel with little/no modifications needed (front) ~ 9"
Widest wheel with little/no modifications needed (rear) ~ 10"


1994~1998:
Bolt pattern ~ 5x4.5" (5x114mm or 5x114.3mm is also correct terminology)
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~ 25.6"
Widest wheel with little/no modifications needed (front) ~ 9"
Widest wheel with little/no modifications needed (rear) ~ 10"

1999~2004:
Bolt pattern ~ 5x4.5" (5x114mm or 5x114.3mm is also correct terminology)
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~ 25.6"
Widest wheel with little/no modifications needed (front) ~ 9"
Widest wheel with little/no modifications needed (rear) ~ 10"


2005~2009:
Bolt pattern ~ 5x4.5" (5x114mm or 5x114.3mm is also correct terminology)
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~ 27.2"
Widest wheel with little/no modifications needed (front) ~ 9.5"
Widest wheel with little/no modifications needed (rear) ~ 11"

2010+:
Bolt pattern ~ 5x4.5" (5x114mm or 5x114.3mm is also correct terminology)
Stud threads ~ 1/2"x20 RH threads
OEM tire diameter ~ 27.2"
Widest wheel with little/no modifications needed (front)~ 9.5"
Widest wheel with little/no modifications needed (rear) ~ 11"


There are ways to address several of the issues mentioned above, but sometimes you just need to keep shopping :(

Off-set/back-space ~ This is the relative center of the wheel and the outside face of it. Over the years, the off-set has increased by over 1". Example: The off-set of an 8" wheel in a Fox Body Mustang ('79~'93) is just under 1", in most cases. On an S197 ('05+), this off-set is nearly twice that amount, yet fits under in a similar visual way. Due to the nearly 1" additional off-set in a positive direction on the S197 wheel, it would be this distance closer to the back of the fender on the Fox Body car.
--> See RS Racing off-set/back-space measurements

Using spacers to address incorrect off-set/back-space ~ There are two common scenarios in which a Mustang owner considers this option. The first, is to move his/her existing OEM wheels outward for a better "stance". This is subjective, of course, but many like the look of a wheel closer to even with the sides of the car. The second reason many consider spacers/adapters, is to install a later model wheel on his/her ride. Example: A few OEM 8" wheels from an S197 Mustang, are approx. 5/8" greater in positive off-set.

Maximum tire diameter ~ As a rule, I think it is best to stay OEM diameter tires, regardless of the wheel width/diameter one uses. It is not out of the question to run up to a 2" or larger diameter tire, but creates a few issues of which one should be aware. First, speedometer and odometer accuracy. Example: one runs a 1" larger diameter tire, so he/she loses 1/2" of clearance all around and GAINS 1/2" of ride height of the car. The earlier Mustangs, pre-'99, have mechanical speedometer gears and requires replacement of them, to restore accuracy to speedo/ODO with larger or smaller tires. The '99+ Mustangs speedo/ODO accuracy is addressed via a tuner and fairly easy to do. Second, is issues of clearance and rubbing and the wider the tire, the more diameter becomes an issue. There are many, many things in play with this one and cannot possibly give all the possible scenarios. Suffice to say, if one sticks OEM diameter tires, many of the potential issues are just not a problem.

Bolt pattern ~ The Mustang has had two different bolt patterns over the years and are 4x4.25" and 5x4.5". They have ALL been 5.4.5" since the introduction of the '94+ models. Needless to say, it is very important to purchase wheels with the proper bolt pattern. There are companies who make adapters to "convert" different patters to one another, but create some possible safety, as well as clearance/rubbing issues. If you are looking to purchase a wheel with a bolt pattern that differs from that which is on your car, do yourself a favor and keep shopping :yes
--> See RS Racing bolt pattern measurements

A fantastic resource for determining most of this stuff, is RS Racing

I will get back to this later today and drop a bit of info on ya :yes
 
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