16x8 on a G-body

[puppet]

Found some nice wheels in an 8" width with a backspacing that I think is workable. Would like to run 225/50-16's on them.

Seen a bunch of posts that recommend using the same offset as the stock rims but I don't see how that's even possible with rims wider than the 6" stock pumpers.

If I'm thinking right ... using this offset calculator:
http://www.1010tires.com/WheelOffsetCalculator.asp
I'd need a 19mm offset (5.25" backspacing) up front (front rims) and still lose 6mm of inner space at the strut. That would move those tires out to the fender lip. The rear wheels could have a 12mm offset (5" backspacing) and that would move those tires out to the fender lip.

Have I got this right or am I missing something?

[BadAssPerformance]

I always get offset and backspacing confused... from your link, wider rims will need more offset. For a 8" wide rim, and my foggy memory 5" sounds like the max backspacing...

[puppet]

They offer a 5.25" backspacing max on the rims I'd like to get ... if that's what you meant. Or are you saying that 5" backspacing is the max for front of car with 8" wide wheels?

[BadAssPerformance]

Yeah, I meant 5" max or less... my 15x8 Bogarts are less than 5"

[puppet]

Where does the outside edge of the wheel? Even with the fender top lip or out past that?

[BadAssPerformance]

pretty even look at the front wheel... I'll try to look at my notes to find eth backspacing, thought it was 4.5" or 5"

[puppet]

https://www.rsracing.com/images/tech-wheeloffset.gif
That's what I used to convert backspacing to offset. Thanks for posting the picture. The 8's look pretty flush. If you find your notes please post what backspacing you used so I have a reference point.

These are the wheels I'd like to go with.
http://www.wheelsforless.com/SearchR...ords=VN4706800

[Aries_Turbo]

i think frank the gazer has 16x8 or maybe 17x8 on his daytona with 225 width tires.

the tires will rot before he gets that thing on the road

Brian

[puppet]

LOL ... would of asked if he liked how they handled but since it doesn't move :P

[cordes]

LOL ... would of asked if he liked how they handled but since it doesn't move :P

What are you talking about, it's like the car is glued to the driveway. Just imagine it on the street!

[Aries_Turbo]

LOL ... would of asked if he liked how they handled but since it doesn't move :P

tell him to put them on his CSX and go for a spin. that car runs and drives! hehe

Brian

[Turbo3Iroc]

That chart above is wrong. Offset is measured from the center of the width of the wheel. That chart listed 4.5" on an 8" wheel as 0 and then calculated from there.

5" Backspacing is +25 mm, 5.25" bs comes out to +32 and 5.35" bs is +35.

I have some 15x8s for my drag slicks and they have 4.75 backspacing making them ~+15 offset. They stick out a bit. They 17x8s I run on the street have a +35 and fit nice. Up to a 235 width tire, I have 245 and they rub a bit.

[Vigo]

might wanna dig up that post i made about backspacing/offset cuz im too lazy to do it myself.

anyway same deal here i got 17x8s at +35mm offset they fit but with a 245 tire you will need to roll your inner fender lips up or they will rub/cut over bumps.

[puppet]

That chart above is wrong. Offset is measured from the center of the width of the wheel. That chart listed 4.5" on an 8" wheel as 0 and then calculated from there.

5" Backspacing is +25 mm, 5.25" bs comes out to +32 and 5.35" bs is +35.

I have some 15x8s for my drag slicks and they have 4.75 backspacing making them ~+15 offset. They stick out a bit. They 17x8s I run on the street have a +35 and fit nice. Up to a 235 width tire, I have 245 and they rub a bit.

I think the confusion is that backspacing is measured from the inboard flange to the mounting pad. Charts offset is the difference between the wheel C/L and the wheel backspace. The chart is constructed using that formula. (4" backspacing doesn't put the mounting pad in the center of an 8" wheel ... 4.5" does.) This chart tells you what the offset is for a given backspace only.

[Frank]

Your the gazer.


No, I did drive on them and they felt and handled great... for the two dozen miles I have put on them. 17x8

[puppet]

LOL ... thanks for the info Frank.

[Reaper1]

I'm running 16x7 +35 Enkies with 225/50/16 Kumho MX tires and even with the rear axle centered I still have slight rubbing on one tire if I hit a particularly nasty bump. I don't know that I'd run 225's on an 8" wheel...235 or 245, but then you WILL have to roll the fender lips and you won't be able to get as much negative camber up front becuase of wheel/strut clearance without having camber plates.

Just some things to think about...

[Vigo]

its possible your rubbing could be due to the camber angle changing so much (like severe body roll but caused by a bump) that the inside top of the tire touches the shock. with that wheel/tire combo you shouldnt be hitting the fender lip no matter what.

where does it touch?

[Reaper1]

I rub in the rear and only under harsh bump conditions, not body roll. There is very little if any camber change on the rear axle(at least in theory). I am bnot hitting the shock body, only the wheel well lip and only in one place. It seems that the lip is just a tad wider at that point than everywhere else. I have a CS Racer andjustable Panhard bar on the car and it is about as dead nuts centered as one can make it.

I just need to roll the lip a tad, which I will do propperly one day. I used a soft blow mallet the other day when I rotated my tires to try and help it a little, but I didn't want to get too extreme since the paint it old, it was cold outside, and I had nothing to support the outside of the lip. I don't know if it worked yet, but so far I haven't rubbed(easy to tell since the tire that is now in that position has never been there before).

I've never had the issue during hard cornering, only harsh bumps....

[Frank]

I would imagine there is some dynamic camber change if you do not have a solid swaybar axle in.