20x8.5 40mm pic

lincolnboy

lincolnboy

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Post pic of mk's with 20x8.5 with a 40mm offset, and any problem with having a 40mm offset
 
A 40mm offset on a 8.5" rim won't look odd on our car as it will stick out further outwards than the stock wheel anyways.
With a 50mm offset, you will need to worry about it hitting stuff on the inside of the front wheels mainly (I'm pretty sure it won't clear.)
 
i'm running 19x8.5 with a 46 offset and i had to use 8mm spacers on the front to clear the upper control arm.. the spacers are only 20 bucks on ebay.
 
will see how it does once i get tires

IMG00003-20100221-1646[1].jpg
 
look at my cardomain page they are a 38 mm offset but thats close enough no issues with rubbing. It is close in the rear.
 
What size tires are people going with the 40mm offset
 
you will probly need your fenders rolled if you go higher than 38, depending on the tire.
 
THANATOS said:
you will probly need your fenders rolled if you go higher than 38, depending on the tire.
Click to expand...

Sorry to correct ya bud, but you're thinking backwards.. positive 40 compared to positive 38 for example, means the wheel will sit further inside the wheel well. A zero offset means the hub mounts in the center of the wheel. As long as I understand correctly.. anyways. A negative 30 means the hub mounts towards the inside of the wheel. Etc..

And width comes into effect here. On a 9.5" or 10" wheel that offset has to be about perfect for these cars. Narrower means offset is more flexible.
 
I thought for example a +50mm off set would push the wheel further out then the original offset letting you put wider tires on. is this right or wrong?
 
245/35-20 is a common 20" tire used on our cars, it is almost the exact same diameter as stock. A 235/35-20 is a hair smaller diameter...
 
A 285/30-20 would be real close to the same diameter, but getting one on a 8.5" rim would be fun (alot of shops probably wouldn't try, as it's not with in the manufacters limits.) Same with a 275/30, but its a lil bit smaller diameter.

I'm running 255/35-20 on my car, but they are almost 1/2" bigger diameter then stock. It is close in a few spots also because I'm running a 42mm offset on a 8.5" rim. I have a speedcal to compensate for the tire size and gear change, but I don't know what would be needed on a 2nd gen to compensate...
 
lincolnboy said:
Could a 55 to 75 be to wide
Click to expand...

55 too wide? 75 too wide? a 75mm tire would be like what you have on your wheel barrow? Maybe narrower? Ha

The only thing in a tire today that is relative in 2-digit is the sidewall..

They call it the aspect ratio,

aspect: •a distinct feature or element in a problem

If you have a 215/55, sitting next to a 315/55, for example, the sidewall is way taller on the 315 than the 215. 55 is referring to tire height in relation to width (or aspect ratio) (the easiest way to understand though probably not politically correct: 55 is 55% of the width, so depending on width, depends on what "55" means.)

If you're thinking about like a ''60 series tire'', that is referring to tire thickness, or height, or whatever, .. the distance from wheel to ground.

You know, if you guys would read through the links I posted, there's tire size/ rim size calculators for pretty much every country, every explanation on them, wheel offset calculators, etc. There's alot of info there, and it explains all this stuff rather well..

According to the calculator, Icarus is right about the 285/30., Your speedo would only be .27 mph off at 70 mph.;
But, according to the calculator.. that size is recommended for a minimum rim width of 9.5", max of 11". You have an 8.5" wheel, so, you want a narrower tire.
Width is the first number "285".
So, go back to the tire size to rim width calculator, decrease your width, hit calculate, see what it says.
It says a 275 is recommended for a minimum of a 9" wheel.
So, decrease to 265, which says is still recommended for a min. of a 9" wheel.

(Granted at this point, you can get it on with a bit of bulge if you like tire bulge)

(Keep in mind different tire manufacturers seem to do things different, some run ''wide'' and some run ''narrow'', BFG for ex. has a history of running ''wide'')

Anyways, decrease to a 255, voila! Minimum rim width: 8.5". Max: 10".

So now go to the calculator, put in your factory tire size on the left, 225/60/16, and put in "255" for the first number, skip the second number, and put "20" for the third number, and play around with the middle number until the calculator says you pretty much match.

A 255/30/20 is short, when your speedo reads 70 you're really only going 68.4 mph. So, bump ''30'' up to ''35", and you get ~71.04 actual speed at 70. So it's taller. If you don't like this, you can dip down to a 245 or up to a 265 until you find something appealing.

It's a good idea to write down all that are close, because prices can be drastically different depending on production volume of certain sizes.

So look at prices, and decide where you want to sacrifice. Once in awhile, you'll get lucky, and find one exact. for me I believe it was a 275/40. But that is on a 9" wheel.

Good luck.

Use the calculators, and read through the info. Knowledge is nice to have.
 
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