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Old 08-25-2018, 08:36 AM
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Wheel / Tire question

Currently on my old truck I am running a set of Cragar wheels and 98T P225/70R14 tires all around. ( I know, but I am old school and I like small diameter wheels and big sidewalls. )


Since I am pulling the bed to re-do the rear suspension to parabolic leaf springs I would like to increase the tire width by 2", if I can add it inboard only.


I am looking for the correct terminology to convey what I am looking for to both tire and wheel guys.


Thanks in advance,

"it is always better to ask a dumb question and get an intelligent answer than to assume an answer based on dumbness."
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Old 08-25-2018, 08:53 AM
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If you want the outside tire sidewall to stay in the same place, and just add the width inboard, then you need to add that 2" to the backspace measurement of your current wheel when you buy the new 2" wider wheels.

Backspace is the measurement from the inboard lip of the wheel to the backside of wheel mounting face where it contacts the brake drum.
Best way to measure the wheel is to lay is face down, place a straight edge across the wheel rim (tire removed) and measure down to the mounting face.

I would suggest going to a 15" rim when you buy, the selection of 14" tires is decreasing every day, it is a size that is dying out.

You may find that there isn't a wheel available that is 2" wider than what you have...if you have a 7" wide wheel now the next common wider size is typically either 8" or 8.5"....not a whole lot of 9" wide wheels offered in traditional hotrod styles.

If you have a 7" wheel now, and find this situation to be true, you could go to a 8.5" wheel and then just add 1.5" to the backspace measurement.

Tire sizing on the 8.5" rim will be in the 265-295mm width category.
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Old 08-25-2018, 09:16 AM
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Quote:
Originally Posted by ericnova72 View Post
If you have a 7" wheel now, and find this situation to be true, you could go to a 8.5" wheel and then just add 1.5" to the backspace measurement.

Tire sizing on the 8.5" rim will be in the 265-295mm width category.
Exactly the kind of advice I was hoping for, thanks.

I have had people tell me that not centering the mounting surface of the wheel will cause excessive load on bearings. While I can see this in a "theoretical" viewpoint the difference in loads caused by a 1-1/2" shift and with all other factors considered I am guessing the difference in bearing wear will be insignifant. Your thoughts?
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Old 08-25-2018, 09:42 AM
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All that BS about bearing wear is just that, BS....might be an issue with a 15" wide wheel with only 4" backspace acting like a lever on the bearings, but for the wheel width you're looking at it is nothing to even worry about.

The bearing wear issue is more of issue to think about on the front suspension and a wide wheel with either a very deep or very shallow backspace.....but on the rear it is nothing.

I run a 15" x 8.5" wheel on my Nova, with 4-7/8" backspace in order to get the tire in under the outer fender lip....been 30,000 miles and probably 6 set's of rear tires, and the axle bearing are still the factory originals as far as I know. Rear axle has had new axle seals, gears, posi, and fluid but no new axle bearings yet.
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Old 08-25-2018, 09:54 AM
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Eric,
Pretty much what I thought.

Now to more specifics... can anyone out there recommend a source for a wheel of that description that looks something like this?
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Old 08-25-2018, 10:35 AM
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I can't help you there, I'm a muscle car guy with no info to offer on traditional wire spoked wheels.

I can guess you may have a hard time finding a wheel like that in any kind of not centered backspacing, due to spoke layout.
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Old 08-25-2018, 10:46 AM
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Depending on your current wheels backspace....this might be what you are looking for. it was the only company I found making one with a deeper backspace than on-center.

https://www.wheelvintiques.com/stree...wder-coat.html
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Old 08-26-2018, 07:08 AM
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First off, thanks for the URL's

Armed with all of your helpful information here is what I have found… first, I have (as you suspected) 7” wide wheels with a 4” backspace. What I wasn’t aware of because of the slotted lug nut holes on the wheels is that the front lug pattern (from a TCI Mustang II unit) is 5x5.5 the rear pattern (from an older 10 bolt posi.) is 5x5.

If I change wheels I feel that something will need to be done here. What is involved in changing the rear axels to 5x5.5? I know adapter plates exist and I can then just add the thickness to the backspace but is that the smart way to go? What are my other (better) options? I would like to run with just one spare.
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Old 08-26-2018, 07:52 AM
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Leave it like it is and find a multi-fit rim as a spare.

Are you measuring right?
Odd thefront is mustang 2 in 5.5. Likely 4.5.
Rear, Maybe 4.75.

Last edited by RWENUTS; 08-26-2018 at 07:57 AM.
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Old 08-26-2018, 08:41 AM
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Will re-measure with the wheels off the truck and get back with you on that one. Don't think the wheel I want comes in a multi-fit style, but I guess the spare could be. Since the new wheels will be different widths I guess it really will not matter. Just the OCD kicking in.
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