I rubbed a +50 in the front at STOCK height. What do you think is going to happen in the rear where even more offset is needed? All I can say is good luck.

 

Then why are some people running 7.5"@50mm and rubbing while others run 8.0"@40mm and are fine?

Because there are other variables. Camber; tolerances on the car, the wheels, the tires; tire widths and diameter differences, etc.

If it's an exact science, why don't you write a nice Excel spreadsheet for us that will calculate exactly what will and will not fit?

 

What tire? How much camber?

 

Maybe they drive on perfectly level streets, take corners at 1 mph, have 205 tires, don't have a lip in their driveway, never drive over speed bumps and have over -2 camber settings all around which looks positively stupid on a street car.

I'd love to drive a car with 8" +40 rims but none of those people would let me... I guarantee it.

 

Camber ......... OEM settings. (why would we be talking about some weird setting that few people would use?)
Tolerances on the car ............ WTF? (Your average S2000 will be same as any other S2000. We're not talking about one that has been modified in terms of suspension. We can only deal in "averages".)
Wheels ............. That's what we're talking about here. We're answering a question related to a very specific wheel spec.
Tire width ............ Close to OEM (Again, we're talking "average", not anything off the wall.)
Diameter differences ................. WTF again? We have to keep within an acceptable limit for speedo and odo calibration.

We're talking about very specific rim specs in this thread as asked in the original question. We're not talking some goofy shit that somebody just happened to buy and spends his life driving around slowing down for toothpicks. We're talking about daily driving over all sorts of average "daily" roads.

 

Hmmm, you seem to be taking a different viewpoint here:
https://www.s2ki.com/forums/index.php?showt...dpost&p=6067807
And for the fronts in that threads, it's only 1/2" difference in rim width and 2 mm more offset, that's only 5mm "stick out" difference and yet you said NO WAY.
I'm baffled.

 

[QUOTE=xviper,Aug 19 2005, 07:29 AM] Camber ......... OEM settings. (why would we be talking about some weird setting that few people would use?)
Tolerances on the car ............ WTF?

 

[QUOTE=xviper,Aug 19 2005, 07:53 AM] Hmmm, you seem to be taking a different viewpoint here:
https://www.s2ki.com/forums/index.php?showt...dpost&p=6067807
And for the fronts in that threads, it's only 1/2" difference in rim width and 2 mm more offset, that's only 5mm "stick out" difference and yet you said NO WAY.
I'm baffled.

 

These variations are not significant enough as applied to the current discussion to make that kind of difference, so my answer would be no.

Based on OEM specs of 17" X 7.5", with 53mm offset (maybe 55 - don't know the exact number off the top of my head) and a 215 width tire with an aspect ratio of 50, one should be able to metally calculate what acceptable combinations there can be. I'm not even going to attempt to give a "blow by blow" of rims and tires that will "work" as this would be like writing a book.
Those OEM specs can be taken as Honda's way of saying "This is safe and has lots of leeway for maximum suspension travel and maximum steering wheel travel and still not rub anywhere or adversely affect handling". To deviate from this is to eat up that margin of safety. How much deviation will, of course depend upon the type of road conditions the owner encounters and how that owners drives the car in those conditions, as well as the alterations made to said car.
For every mm of extra tire and/or rim width from OEM and still stay within the design parameters, one should divide this by 2 and increase the offset by that amount. This allows the rim/tire outer edge to be placed more or less at the same location (of course, this will cause a deviation in the midline of the tread toward the inside). (This is not to say that a certain amount of deviation to the outside cannot be incorporated - beyond Honda's design). However, increasing offset will arrive at a point where the inside will protrude too far and begin to interfere with moving parts. All this assumes that effort is taken to ensure that the overall tire diameter is kept more or less the same.
As I've indicated before, it is common knowledge that people putting 225/45/17 tires (even on OEM 17" rims) on the front of an otherwise stock suspension S2000 have been known to grind into the upper plastic retaining plug for the wheel well splash shield during hard suspension compression (perhaps not done often for a street driven car). I view this as the upper limit of tire size, rim size and offset for this car. Certainly if wider tires or rims are chosen, offsets not properly chosen and/or if the car is lowered, all bets are off.

 

You're nuts. Some of the differences from tire to tire of the same labaled width are significant, especially on carcass and tread width. Case in point: OEM 16" rears are wider than most, OEM 17" fronts are narrower than most.

Thanks for the other info.