Rotor Connection

iTrader: (1)

How are you guys actually measuring those super aggressive fitments?.. i got some wide fenders for my vert, 30mm back and 20mm in the front, a gp kit now, and ready to drop major cash for a set of Weds Kranze Borphes and i need to be SUPER SURE that they are going to fit and what kind of tire. don't want to drop $ and wait for nothing, i want the most lip possible 18x10 in the front 18x10-11.5 in the back. do i have to buy one of those wheel fitment tools?? or i can do the work with an old fashion ruler.

DK

iTrader: (5)

A ruler, a pencil & some paper will work.

I know... imagine that.

You could scope out another FC's specs with the fitment that you like on the outside and calculate how wide that wheel is from the hub. Add in your fenders and calculate backwards. Maybe that FC's fitment is pushed by low offset and isn't as wide as you could go inside, so find another FC with really wide wheels (but maybe not hella flush) and calculate how far the wheel is sticking inside. Add it all up... boom... that's how wide you can go. Figure out your offset with a little math and party.

25.4 mm / inch. Get busy.

Decent wheel choice, by the way.

purerx7

iTrader: (61)

Well said, a lot of the guys with extremely low offsets run a very skinny tire BTW. It is a combination of a low offset/ wide wheel/ negative camber and skinny tire. I wish there was a way to block out words like "hella" :/

Rotor Connection

iTrader: (1)

jaja "Hella" wasn't my first choice.. but its seems to be the standardize word that people associate with aggressive fitment and stretch tires.

this is how I'm planning on calculating my offset, if i were to use an 11.5" wide rim

11.5in to mm is 11.5 x 25.4 = 292mm, so no i'll tape my ruler to mark and replicate the rim wight. Now i get a second ruler to mark the relation from the hub to my rim ruler, lets say that i have my rim flush, and the hub is for example at 141mm, a 0 offset will be 146mm so i subtract 141mm - 146mm = -5mm offset...

I'm on the right track here???

aznpoopy

doing it on paper is good to get a general idea.

but you should wait till the fenders are fitted and do some test fitting with actual wheels before you finalize your wheel size.

just grab some widish wheels and play around with spacing them out to figure out what external fitment you want.

then convert, keeping external fitment the same.

Miata_mx5

You need a nut, string, ruler, some tape, and some spacers can help too.

You also need all body and fender work done.

You need suspension and brakes done as well.

Having a good idea what alignment, (suspension parts) you need to accomodate that is a good idea too.

PM me if you want to know how to do it. At SSR we have some specific tools to help us measure and figure out certain clearances, but these are not required for "gangster fitment" on street cars.

Just bear in mind, running aggressive fitment involves a few tradeoffs. If you are ready to make the commitment to do it modification, and finance wise (and it is such), then it's easier to get this done.

Josh18_2k

iTrader: (3)

you also need to know that your fenders are not 20/30mm
aftermarket body parts are pretty much never exactly as advirtized. like they all said, you gotta measure and test fit to get the best fitment.

eyecandy

iTrader: (19)

Best thing to do is find some friends in your area with wheels you can try, then take measurements based off the fitment.

ARD T2

iTrader: (22)

Your calculation here is not correct.

You have to remember that the Rim width is not the actual total width of the wheel.

8.5" wide wheel is actually about 9.5" from outer edge to outer edge. So your tire stretch is going to depend on the total width of the rim.

Rishie

PS: MY RECOMMENDATION IS TO TAKE A MUCH SIMPLER APPROACH AND IN THIS ORDER.


1. DETERMINE WHAT WIDTH TIRE YOU WANT TO RUN
2. DETERMINE HOW "HARDCORE" OF A STRETCH YOU WANT
3. DETERMINE WHAT ALIGNMENT SPECS YOU WANT TO RUN
4. NOW THAT YOU HAVE THOSE 3 CRITERIA YOU CAN ACTUALLY MAKE HARD CALCULATIONS FOR OFFSET.

OR

LOOK AT WHAT OTHER FC GUYS HAVE DONE, TIRES, RIM, AND ALIGNMENT, JUST REPLICATE THE ONE YOU LIKE OR USE IT AS A BASELINE TO CALCULATE WHAT OFFSET YOU NEED TO BE AT.

ARD T2

iTrader: (22)

look for common tire stretches and list them.

i.e.
17x9.5 with 235/40/17
18x10 with 225/40/18
18x10.5 with 235/40/18
18x10.5 with 245/40/18

Those are pretty common for a nice looking stretch.

Rishie