Am I understanding how offsets work correctly?

[Lgarretto]

Hi guys. I've been trying to do research on wheels and offsets and learn about it as I've found some wheels I like. The ones I have found are 19x9.5 with either a 22 or 35 offset. I am lowered about an inch on steeda sport springs.
From my understanding my stock rear pp wheels are 9.5 with a 52 offset. Dropping to a 22 offset should move the wheel out about 1-3/16 of an inch if I'm doing the math right. Alternatively the 35 offset would move the edge out about 11/16. And with a tape I have about 1-5/8 inch from the outside of my tire to the inside of my fender in back and about 2-1/8 inches in front.
So this would mean the 22 offset should fitand move both front and back to about 7/16 from the inside of the fender. Which should fit just fine. Is this correct?
Thanks

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[NightmareMoon]

Hi guys. I've been trying to do research on wheels and offsets and learn about it as I've found some wheels I like. The ones I have found are 19x9.5 with either a 22 or 35 offset. I am lowered about an inch on steeda sport springs.
From my understanding my stock rear pp wheels are 9.5 with a 52 offset. Dropping to a 22 offset should move the wheel out about 1-3/16 of an inch if I'm doing the math right. Alternatively the 35 offset would move the edge out about 11/16. And with a tape I have about 1-5/8 inch from the outside of my tire to the inside of my fender in back and about 2-1/8 inches in front.
So this would mean the 22 offset should fitand move both front and back to about 7/16 from the inside of the fender. Which should fit just fine. Is this correct?
Thanks

Smaller offsets are more outboard. Larger offsets are inboard. Also, imperial units with fractions suck. Just use decimals.. Converting fractions is a pain.

Factory PP1 rear wheel is a 9.5 ET52.5 Offsets are in mm, and 25.4mm = 1"

52.5-22 = 30.5mm = 1.2", so going to a 9.5 ET 22 from your stock PP1 rear wheel will move it outboard by 1.2" (approx 1-3/16")

The ET35 would move the rear out by 0.69" (approx 11/16).


The stock the front is a 9 ET45. Widen that by 0.5" (0.25" on each side), and the outside edge moves outboard by 0.25". Shifting from an ET45 to an ET22 is 23mm more outboard, or 0.91" for a total of 1.16" on the front. If you're starting with 2.125 to the fender edge, then 2.125-1.16 = .97" to the fender edge.

 

[Lgarretto]

Sorry about that. I am a machinist by trade. Common fractions are interchangeable with the decimal number in my head so I tend to think and speak that way.
But that is pretty much how I was thinking of it. Thanks.

 

[ChitownStang]

Anyone know the stock offsets for the 19x9.5 front and 19x10" rear on the Mach 1 non-HP?
I need to shop for winter tire setup in a few months

 

[MidwayJ]

Hi guys. I've been trying to do research on wheels and offsets and learn about it as I've found some wheels I like. The ones I have found are 19x9.5 with either a 22 or 35 offset. I am lowered about an inch on steeda sport springs.
From my understanding my stock rear pp wheels are 9.5 with a 52 offset. Dropping to a 22 offset should move the wheel out about 1-3/16 of an inch if I'm doing the math right. Alternatively the 35 offset would move the edge out about 11/16. And with a tape I have about 1-5/8 inch from the outside of my tire to the inside of my fender in back and about 2-1/8 inches in front.
So this would mean the 22 offset should fitand move both front and back to about 7/16 from the inside of the fender. Which should fit just fine. Is this correct?
Thanks

Are you sure you have that much room in back? Reason I ask is my 19x9.5 wheels are pretty much flush with the fender with +33 offset. Also, the pics of PP1 wheels I see with 1 inch spacers (effectively +27 offset) look very flush (maybe even a slight poke) in the rear.

 

[Lgarretto]

Really more like 1.5" actually.

 

[Lgarretto]

Regarding that i think it's really just because of the amount of camber I have. You can kinda see the front in that Pic and there seems to be a lot. I don't have camber plates, I was told I shouldn't need them, but it's just steeda sport progressive springs and steeda dampers. The thought the car would lower by about an inch but according to my before and after tape measure its closer to 2 inches. I haven't had a chance to get camber plates yet. Just an alignment. But it's more than an inch for sure

 

[MidwayJ]

Regarding that i think it's really just because of the amount of camber I have. You can kinda see the front in that Pic and there seems to be a lot. I don't have camber plates, I was told I shouldn't need them, but it's just steeda sport progressive springs and steeda dampers. The thought the car would lower by about an inch but according to my before and after tape measure its closer to 2 inches. I haven't had a chance to get camber plates yet. Just an alignment. But it's more than an inch for sure

Having some negative camber is probably needed for +22 offset in back. That's pretty aggressive.

 

[Lgarretto]

Mainly I asked the question because most of the wheels I end up liking (esr sr07, cs15, etc) have an option of +22 or +35 offset and I wasn't for sure which I should go with. I was leaning toward the 22 but I wasn't sure.

 

[MidwayJ]

Mainly I asked the question because most of the wheels I end up liking (esr sr07, cs15, etc) have an option of +22 or +35 offset and I wasn't for sure which I should go with. I was leaning toward the 22 but I wasn't sure.

+35 is a more common offset for wheels designed for S550s. You could always use a 5 mm slip on spacer in front to push them out a little more. I've been eyeing the ESR RF15s myself.

 

[Lgarretto]

Those aren't bad. I am leaning toward the sr07 myself. But I like the contrasting lip color from the cs15. But I think 35 offsets will be best. That is true that u can just add a small spacer if need be

 

[NightmareMoon]

+35 is a more common offset for wheels designed for S550s. You could always use a 5 mm slip on spacer in front to push them out a little more. I've been eyeing the ESR RF15s myself.

ET35 is common with a 10" wheel, but we're talking about a 9.5" wheel, and you can run a ET30 for a similar fit. 22 is probably aggressive on the rear, yes, and a ET35 with a +5mm spacer (ET30) would be a good solve for the front.

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