Okay so I'm trying to find rims that i can throw on my car with little to no additional mods. I would like my rears to be 15×10 and the fronts to be maybe just 15×7. I actually cant believe that im typing this but i seriously can't find anywhere that says the offset of the OEM 20 spoke spider rims let alone in metric measurements. That being said, I've been unable to find rims that fit the specs that i would prefer and I'm super paranoid about the hubs cause, as im sure everyone here knows, stick out what feels like a mile. Anyone here have any suggestions for rims that have usable hubcaps or at least any info on what offsets I need?

 

Almost all, if not all thirdgens use 0mm on all four corners, or (2)wheels with 0mm up front and (2) wheels with +16mm offset out back. It's very common to find offerings of 4 matching wheels, all with 0mm offset. All the plus sized IROC and GTA wheels, Firehawk replicas, and many of the old rally style wheels are offered 0mm on all 4.

 

I definitely appreciate the help! Gunna measure up the space between the rim's mounting point and the back lip of the rim. The fact that the offset is zero makes the rest of the math as easy as cutting cake.

 

When you're shopping for wheels in a catalog, keep in mind the relationship between backspace and offset is a bit quirky because wheels are actually 1" wider than advertised.

For example, most people would think a wheel advertised at 10" wide with 0" offset has 5" of backspacing. Nope. The wheel is actually 11" wide overall (1/2 inch extra each side), so the backspace is (5 + 1/2) = 5.5". This is really important to understand if you're trying to convert offset values from a catalog into backspace values. Get it wrong and your wheels won't sit where you intended.

I don't know why so many wheels are spec'd out in terms of offset. It's a goofy system. You can't even measure it on a real wheel. You have to measure backspace and overall width, and then calculate offset from that. Backspace is the better way to think when you're measuring out for clearance on a real car. And you can directly measure backspace on any wheel, no tricks or calculations.

 

Okay wow. Yea ive been trying to find 15×10 5×4.7(120) with 5.5 backspace for some 285/50R15 tires that i want for the appearance alone and had been having exactly no luck. Its a good thing im easily distracted/very picky when it comes to rims. Thats the most useful thing ive ever read and will probably never be told again

 

Only time you need to do the funny math is going from catalog specs of offset to the real world where you're interested in backspacing (for purposes to evaluate actual clearances on car).

If you're measuring a real wheel then measurements are what they are, no funny math needed.

 

I probably spent an hour one night, trying to figure out what the "F" I was missing, when it came to backspacing!!!!

 

Ha! Well, that's a lot quicker than me. First time I ran into this it took me days to figure out why the frick backspacing and offset didn't add up. And it took me weeks, if not months to verify that an extra 1/2" was pretty standard number for most wheels.

 

Well I know my Iroc wheels are 0 offset and 4.5 backspacing. 8" wide. That's pretty solid info soooo I knew I was obviously missing something....just had to figure out WHAT.

 

I have 17x9 with 5" backspace, so basically 10" overall width with 0 offset. I can tell you that wheel sticks out too far to tuck inside the wheel well. You would never be able to put a fat/tall tire on it, would get cut on the fender lip. I'm guessing a 15x10 needs to be tucked a lot more than that. I wouldn't be surprised if it needed 6.5" backspace (if it will clear to the inside).

Usually people with 15" rims are running tall tires with a lot of sidewall. Seems the smarter thing to do with a tire like that is to run a more narrow wheel, or else the tire may not fit in the wheel well. Don't want to be jacked up in the air just trying to keep the tires from hitting the fenders. Tall tires need to tuck nice with free suspension movement.

 

So ive decided on rims and tires: vision 57 rally chrome rims at 15×10 with a total BSM of 4.75" including the weird half inch crap (i know they have questionable quality control but they do every possoble size i could ever want) and the tires are going to be a set of 26×10.5R15 ET Street R Bias-Ply from 'ol reliable Micky T's. The tread is 8.5" across and tire bulge width at 10.5". This SHOULD make it so the "tread" dodges the fender when the suspension is compressed. The fronts will be a different story all together but it shorld be just as easy assuming it needs as much BSM as the rear. Wish my broke a- i mean 'butt' luck.

 

What is BSM? I usually try not to talk with acronyms for the sake of clarity.

Do you have a narrowed axle? if not, then those wheels are going to stick out beyond the car.

 

And I've never looked into it myself but I'm not even sure a 15x10 can fit on the car without removing bump stops and deforming inner fenders. Anybody going that big really needs to take the time to measure everything out on their car because there's just no room for error.

 

You're gonna Joe Dirt your car with 4.75 BS on a 15x10 wheel

 

I have 6.5 BS and had to remove the bump stops, If I remember right you can get away with it with 5.5 BS, the wheel will sit even with the fender lip with no modification

 

I didnt think removing the bump stops was a problem. I mean like i already lost them lol.