xviper

I've PMd you.

AP12001

i was talking to a 5ZIGEN representative. Aaron said that for an 8.5" width rim in the front, it can fit as long as the offset is +52 or more with no rubbing whatsoever...

i just thought id comment since it mentions above that "8.5" wheel needs a +61 offset (215, 225, or 235 tires) minimum to fit.

xviper

A 225 tire on a 7.5" rim with +50 offset (front) will rub on extreme suspension compression (known fact). It slowly, over time, will grind away the top splashshield fastener.
An 8.5" rim will push the outer edge of the rim 1/2" (12.7mm) further out. The extra 2mm offset will not make up for this. You would have to use a tire that is 1" narrower to compensate (maybe a 205 tire or less) and it may still rub on extreme compression.

Methinks a "salesman" is just trying to make another sale.

Ubetit

He's wrong. I know from experience

xviper

Thanks for the "real world" confirmation.
Calculations don't usually lie. SALESMEN, on the other hand .............................

abv

Just a thought....

What may be helpful is to have a chart with a minimum and maximum offset that will work so that no one will need to ask the dreaded fitment question.
(I can build a chart all i need is the information to do it) I assume tire size would also be a concern as well.

I could build into an excel chart based on wheel size and tire size.

Or perhaps in the existing excel calculator a flag that would indicate that the rim would not work. Not just how much further out it pushes the wheel.

As I mentioned I would be glad to do it if I can get the info from someone.

spa-zz

Not sure if anyone knows the maximum offsets that can be used. There are so few wheels with offsets high enough, much less too high.

The chart already lists the minimum offsets. The problem is that people don't read the Guide, even though it's there.

Not everyone has Excel, so that's not the best way to do it.

I'm in the process of re-writing the Guide, to be easier to read and use. I'll be posting it soon. It will be based on offset and tire width, because that's what really matters. Wheel width is secondary, and just needs to be chosen to fit a given tire. Also it's written in a FAQ format, with a Table of Contents, so people can quickly find their answers.

Cheers,
Spa-zz

xviper

The problem will always be that we have too many possibilities. We'll have rim widths, offsets and tire widths and aspect ratios. Imagine the combinations of minimum this and maximum that.
Minimum offset with maximum width with minimum tire width and maximum aspect ratio.
Maximum offset with minimum width with max tire width and min apsect ratio.

See where I'm getting at here? The specs have been stated in this thread. It's sort of up to the reader to use his own visualization and mental skills to put all this together. Lacking those, I guess we'll always continue to get "Will these fit?"

lazykiwi

i'm trying to decide whether to get some wheels that would be the following sizes:

18x7.5 +43 (front)
18x8.5 +55 (rear)

a the top of this thread it says, "it's said that an offset of 48 with a 7.5" wheel is about the maximum before you start having problems with rubbing".

then there's a chart of the "minimum recommended offsets":
7.5" wheel: +48 offset
8.5" wheel: +46 offset

i'm confused about the minimum versus maximum. so will these fit without rubbing?

spa-zz

You're copying and pasting offsets from front and rear next to each other. The requirements for front and rear are different.

The Guide only shows minimum recommended offsets because there are virtually zero wheels out there that have too high of an offset. You want to use the highest offset you can find in virtually 100% of cases.

Your scenario will work only with very narrow tires on the front, perhaps 205s.

Cheers.