Now, a dumb question... I understand offset to be the distance of the hub from the centerline of the wheel in any direction. Positive offset, as I get means that the hub itself is pushed closer to the out facing edge of the wheel, and negative offset being where the hub itself is actually offset from the centerline of the wheel towards the inside of the fenderwell. Running a lower positive offset will push the wheel itself further out, forcing it closer to the fender lip.... I think. Spacers are starting to make me confused, and I want to make sure I have it right before I start trying to do things to my car that are going to render it inoperable, and piss off the wife. Let's say, I'm running a 40mm positive offset. That means, from centerline my hub is 40mm closer to the outside face of the rim than a wheel with a 0 offset. Now by adding a 10mm spacer, would that effectively make the wheel a +30mm offset? Seems to me by adding 10mm to the hub face of the wheel (which I understand is effectively what a 10mm spacer would do) that's exactly what would be happening. By this logic, would I be better off running a lower positive offset, say a 35mm? Or is there something I'm missing here?
Yeah, I'm already pretty set on wanting 245/40/17 Direzza Star specs.... phenomenal tire the one time I did get a chance to drive it. I'd love to go to a 255, but I fear that it might be too extreme, even on a 17.... but this definitely has me going in the right direction. Thank you gentlemen.
Wheel diameter won't make a difference, that's why there are different aspect ratios. There are a lot more tire options in 17" than 18" though. 255 is doable but it will require some work. You will need all the adjustability that you can afford.
PS: Did you come from a DSM?
ture, but they dont' really show anything if you want to go with an aggressive or even semi agressive setup... they wouldn't consider selling me something in less than a 48 offset when i was looking for something
There's a good reason for that... Going away from the stock offset by too much will make a high power FWD car into a torque steering monster due to the scrub radius change. To me... anything farther than 5mm different in offset from factory makes the car torque steer during sweepers and traction limited situations to the point it's dangerous. Wider tires also make this more pronounced. The wheels I'm running right now (17x7 +45) make the car scary to accelerate hard out of a turn, the car starts steering itself to the inside of the turn more and more the more throttle you add. Also, if one tire starts to spin in 3rd on wet roads... the car freaks out and lurches off to one side, then weight transfer makes the other side spin, and the car ends up lurching side to side. Very scary. Every high power FWD I've ever driven with non-stock offset was the same way. I had the same problem on my FWD dsm using +40 (stock was +46). It also affects the car similarly during braking. I'm planning on going to a 17x8 +50 offset wheel on my car to minimize the problem. I don't really care if they are perfectly flush as long as the car handles properly (like it did with the stock wheels).
I understand flush wheels look great (...to a point. I'm not one for the dune buggy look), but I don't see a point to it if you're ruining the handling of the car by messing with the offset to accomplish it instead of just the wheel width like you should.
Just thought that all the people checking this thread to pick out wheel sizes and offsets should have this info.
Can I fit Rota G-force, 18x8.5 with Dunlop Direzzas 225/40/18 without rubbing on stock suspension?
What suspension springs or coil-overs will keep me close to stock height if I upgrade next year?
its defiantly gonna rub on stock suspension
Not true. I rocked my 18x8.5 +48 Rota SVN's with 225/45 tires. I didnt rub one bit on stock suspension. Now if your offset is +42 or lower, you will rub. Offset is key to the fitment game.
Thanks,
I was hoping they wouldn't rub. Is it because it is 8.5 wide? I am in Hawaii and the roads are horrible. Rubbing is not acceptable for me. Do they make the G-force in 7.5 or 8. I might have to look at a different wheel.
Offset is key to the fitment game.
dude i have 17x7.5 with 225/50 tire and it rub so bad i had to roll my fenders