Need stock Wheel offset help.
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Senior User
Joined: Jan 2004
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From: Mobile, AL
Need stock Wheel offset help.
I need to get stock wheel offset for a 64 F100. I have late model bronco wheels now and I don't know if they are the same as stock. I'm buying a set of 15" wheels and wanted to use the stock offset as a guide.
Thanks,
MIke
Thanks,
MIke
Elder User
Joined: Feb 2004
Posts: 909
Likes: 9
From: San Luis Obispo, CA
OK; From direct measurement: With the bare wheel on the floor, the mounting plane is 3-3/4 inches up. This 15" wheel measures 6" across the outside of the rim and 5" between the tire bead mounting surfaces. (my sheels came from both my '61 F-100 and a '63 F-100 that I parted out and they were all the same.)
I'll let you calculate the number that is called "offset". I think it is the 3-3/4" distance with half the rim width subtracted.
tbm3fan,
What measurements are you using to get your offset? I assume you are measuring your '65. Does your wheel I have a wider rim width than mine?
I'll let you calculate the number that is called "offset". I think it is the 3-3/4" distance with half the rim width subtracted.
tbm3fan,
What measurements are you using to get your offset? I assume you are measuring your '65. Does your wheel I have a wider rim width than mine?
Last edited by acheda; Mar 24, 2007 at 06:10 AM. Reason: add info
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
There are two 15 inch wheels listed for tubeless tires (95% of the trucks had them) on 1963/66 F100's.....but...the only difference is how the hubcaps mount...otherwise they are identical.
Cargo Master
Joined: Jul 2006
Posts: 3,014
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From: Concord, CA
A 15" ruler across the backside of the rim and then another ruler perpendicular to it and touching the rim of the mounting flange gave me 5 1/2". Actually let's subtract maybe 1/8" due to the thickness of the ruler across the rim. Doubled checked this since cars are around 3.5 - 3.75" deep, but the trucks wheels are deep just by sight. The rims have the mounting tabs to the outside for 10+" dog dish hubcaps.
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Elder User
Joined: Feb 2004
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From: San Luis Obispo, CA
tbm3fan,
Your 5-1/2" dimension is measured the same way as the 3-3/4" I got from my wheels. I believe this dimension is sometimes referred to as the "back-space" of the wheel.
(The offset is measured from the center of the rim to the mounting plane of the wheel, but so many people use the word offset for other things, I thought it would be best to share the raw dimensions, without worrying about the terminology.)
All I can think of is that your rims are either a different option for '65 or were replaced somewhere along the way with wheels from a later Ford truck. I have some '80 Ford F-150 rims that are wider rims with similar dimensions to yours.
It looks like we need someone else to be a "tie-breaker".
Your 5-1/2" dimension is measured the same way as the 3-3/4" I got from my wheels. I believe this dimension is sometimes referred to as the "back-space" of the wheel.
(The offset is measured from the center of the rim to the mounting plane of the wheel, but so many people use the word offset for other things, I thought it would be best to share the raw dimensions, without worrying about the terminology.)
All I can think of is that your rims are either a different option for '65 or were replaced somewhere along the way with wheels from a later Ford truck. I have some '80 Ford F-150 rims that are wider rims with similar dimensions to yours.
It looks like we need someone else to be a "tie-breaker".
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Cargo Master
Joined: Jul 2006
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From: Concord, CA
Maybe so as I first thought that in the original post that offset and backspace were one and the same in this instance. If someone asked me the offset for the stock wheel on a Cougar I would automatically think backspace since he was probably thinking of going to aftermarket wheels where backspace is critical. The truck happens to have 5 identical rims on it as the spare was pulled from a junkyard '66 awhile back.
Elder User
Joined: Feb 2004
Posts: 909
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From: San Luis Obispo, CA
tbm3fan,
I took a look at your gallery and I think the hubcaps, and hence the wheels, on your '65 are later models. Nothing wrong with the late wheels: they are wider, have safety beads, and they are what I will be using on my '61, although I will be running '56 Ford sedan chrome hubcaps.
P.S.: I like your Parklane. I inherited and drove the '65 Merc Montclair Breezeway that my Dad picked up at the factory until I rolled it I twelve years later. The only thing to do was replace it with a Ford truck. First it was a '65 F-100, which I sold last year, in favor of my current projects. (Sometimes I think I should have kept the '65 and sold the other two.)
I took a look at your gallery and I think the hubcaps, and hence the wheels, on your '65 are later models. Nothing wrong with the late wheels: they are wider, have safety beads, and they are what I will be using on my '61, although I will be running '56 Ford sedan chrome hubcaps.
P.S.: I like your Parklane. I inherited and drove the '65 Merc Montclair Breezeway that my Dad picked up at the factory until I rolled it I twelve years later. The only thing to do was replace it with a Ford truck. First it was a '65 F-100, which I sold last year, in favor of my current projects. (Sometimes I think I should have kept the '65 and sold the other two.)
Last edited by acheda; Mar 24, 2007 at 07:11 PM. Reason: add info
Thread Starter
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Senior User
Joined: Jan 2004
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From: Mobile, AL
Thanks for the info guys.
Since this turned into somewhat of a technical discussion, I think this link might be useful to any one wanting to know how to get wheel measurments. www.rsracing.com/tech-wheel.html#backspace
Thanks,
Mike
Since this turned into somewhat of a technical discussion, I think this link might be useful to any one wanting to know how to get wheel measurments. www.rsracing.com/tech-wheel.html#backspace
Thanks,
Mike
