Buying new Wheels need help with offset - Ford Powerstroke Diesel Forum
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post #1 of 16 Old 06-03-2013, 05:18 PM Thread Starter
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Buying new Wheels need help with offset

i have 35s on m truck now and they rub a bit at full lock so I wanted to get rims to push them away from my leafsprings a bit.

Now that im shopping im seeing backspacing and offset + or - and im lost
what will push my tires more towards the outside of the truck?

Thanks guys

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Originally Posted by dentexpowerstroke View Post
I've already explained that to him multiple times tho and he doesn't understand... Im about to bust out some crayons and draw it for him.

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post #2 of 16 Old 06-03-2013, 05:28 PM
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Negative offset will push the wheels toward the outside of the truck

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post #3 of 16 Old 06-03-2013, 05:44 PM Thread Starter
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Mickey Thompson MT-28 Wheel

So the 4-1/4 backspace and -6 offset should be good enough?

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I've already explained that to him multiple times tho and he doesn't understand... Im about to bust out some crayons and draw it for him.

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post #4 of 16 Old 06-03-2013, 10:29 PM
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Quote:
Originally Posted by mcyrana View Post
Mickey Thompson MT-28 Wheel

So the 4-1/4 backspace and -6 offset should be good enough?
Stock you have a 0 offset, so -6 is only moving centerline of the wheel out 6mm from stock.

I would be looking for at least -12 offset (1/2"). Maybe even a -18 or -24 depending on how bad they rub the leafs. And if you like a wide stance.

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post #5 of 16 Old 06-04-2013, 09:19 AM
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Keep in mind that the necessary amount of backspacing depends on the width of the wheel. I have 16X8 wheels with -6mm offset and 315/75R16 (35s), and I have a little bit of rub with the leafs when at full steering lock. My friend has the same backspacing with the same size tires, and he doesn't have any rub. We both have only leveling kits installed. I think the knobby sidewalls on my tires (Goodyear Duratracs) make the difference.

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post #6 of 16 Old 06-04-2013, 10:48 AM
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I run a 17x9 with 4.5" backspace with no problems. Worry about backspace more so than offset, the worry about having too much negative offset is sticking out too far and rubbing

That MT you picked out should be fine 4 1/4 would give you a 1/4" more clearance than I have and I don't rub.

I run these http://www.summitracing.com/parts/pcw-98-7887/overview/
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post #7 of 16 Old 06-04-2013, 04:37 PM
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Backspacing and offset are two different ways to define the same thing... the location of the hub mounting face on the wheel. Backspacing is based on the distance from the inside wheel edge to the mounting face, while offset is based on the centerline of the wheel to the mounting face.

So, you need to worry about backspacing and offset equally.

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post #8 of 16 Old 06-04-2013, 07:49 PM Thread Starter
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Quote:
Originally Posted by Devil Car View Post
Keep in mind that the necessary amount of backspacing depends on the width of the wheel. I have 16X8 wheels with -6mm offset and 315/75R16 (35s), and I have a little bit of rub with the leafs when at full steering lock. My friend has the same backspacing with the same size tires, and he doesn't have any rub. We both have only leveling kits installed. I think the knobby sidewalls on my tires (Goodyear Duratracs) make the difference.
Ok so you have the same exact tires as me.
what im going for is a nice wide stance without going insane and to gain my full steering back.

so basically do I want a lower or higher backspacing along with the - or + offset

Sorry i know alot about everything else EXCEPT this

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Originally Posted by dentexpowerstroke View Post
I've already explained that to him multiple times tho and he doesn't understand... Im about to bust out some crayons and draw it for him.

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post #9 of 16 Old 06-04-2013, 08:11 PM
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Quote:
Originally Posted by Devil Car View Post
Backspacing and offset are two different ways to define the same thing... the location of the hub mounting face on the wheel. Backspacing is based on the distance from the inside wheel edge to the mounting face, while offset is based on the centerline of the wheel to the mounting face.

So, you need to worry about backspacing and offset equally.
I like to use offset, as it is exact (1mm or .039"), while backspacing is approx (within 1/4")

To the OP, hope this helps.

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post #10 of 16 Old 06-04-2013, 08:58 PM
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Negative offset will move the mounting face closer to the vehicle, resulting in the wheel's centerline moving away from the vehicle (tire is moved outwards) giving you more clearance between the tire and the leaf spring.

Less backspacing will also move the mounting face closer to the vehicle (like negative offset), also moving the tire outwards from the vehicle and giving more clearance between the tire and the leaf spring.

Here's a helpful tire and backspacing calculator: Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

Good luck! Let us know what you end up with!

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