Assumming the width of the wheel remains constant, is there a maximum positive/negative offset? If so, is there some mathematical formula for this calculation?

Thanks in advance!

 

With width of wheel remain constant? You mean against stock?
Well, if you looking to remain constant with stock, good luck finding an alternative.
Stock wheels are 16x6.5 +55 and 16x7.5 +65 (that's positive 55 and 65!)
You want to stay in the same general area, if you have less offset, the wheel will go out more. Meaning, the lower the offset number, the more the wheel will sit toward the outside fender. Too less, the wheel/tires will hit the fender on bumps and turns. It also depends on what tires you use too.
What is your goal?

 

It's just a generalized question. I'm not looking to find proper offsets for wheels that will fit the S2000, as I know you can find that out in the FAQ. Just was wondering if anyone knows of an equation for computing offsets in general? I do know that offsets are determined from the center of the wheel going inward/outward for negative/positive respectively.

For example: on a 7 in wide wheel there's 3.5 in left/right from the center. With 3.5 in available, what's the max. positive/negative offsets does that equate to??? With this kind of knowledge, I'm sure it will help in determining proper offsets for whatever size wheel for any particular car.

I'm sure there's some kind of mathematical equation for this. Anyone???

 

just for your library of information I run 16 inch Volks Te37's with an offset of + 42 MM each. I do not race but plan on putting it on the track at some point. My car tracks better, handles better and is faster with these wheels on it and unless I hit a huge pot hole at high speed I just can not see my wheel hitting my fender. Tell me if you think I am wrong. I guess if you either lower your ride and/or put on larger wheels you might have to worry about it rubbing.

 

i don't think there is an equation for computing maximum/minimum offsets...any change you make will affect the geometry of the suspension, and therefore affect handling. the more you change, the bigger the effect. if you are only concerned about rubbing issues...then it just depends on how much space is in the wheel wells, and whether your car is lowered.

if you care about handling, you may consider the change in track width as well:

for example:

going from stock: 16X7.5 w/ 65mm offset
to: 17X8.0 w/ 45mm offset

the change in width (on one side of the car) is:

(65mm-45mm) + [(8.0" - 7.5")/2] = 20mm + ~6mm = 26mm

so the total change in track is 26mmX2 = 52mm.

the more you decrease offset, the more chance you will run of rubbing the fenders. the more you increase offset (not likely considering the extremely high stock offset), the more chance you will run of not clearing the brake assembly or rubbing the suspension.

if you are worried about handling: the more you decrease your offset, the wider your track width is going to be, and the larger your positive scrub radius is going to be. both affect handling. i posted a discussion about both if you are interested. you can find it by searching for scrub radius.

hope this helps.

 

I don't see how 18" wheel and tires would be a benefit since, stock tires can be increased to 245/45 rear and 225/50 front. I read this some where on this site, I am trying to find it now.


SSR-GT3: 18x9.5 rear plat form still suggest or require at least a minimal of stock offset +65mm, increasing to 255 or 265(can figure that out on the site) can it handle a 265 max rear? and 18x8 +53mm 225 max front.

The cost factor of going to 18" wheel and tire doesn't make sense.

Is there something that I am missing?

Can the stock rim handle an OEM S02 bump to 245 rear am I getting a little off path??

I'm new at this also, just trying to find the benefits.

sportscompactcar: just did a review on this and lowered the car and the car's handling performance on the slalom lost time, there point was don't lower the car. The main part of the performance package was the s/c.

http://www.sportcompactcarweb.com/archives...re01_0801.shtml

 

[QUOTE]Originally posted by ayrton22
[B]i don't think there is an equation for computing maximum/minimum offsets...any change you make will affect the geometry of the suspension, and therefore affect handling.

 

hey chris:

here's the link to the scrub radius/track width discussion that pertains to change in offset

https://www.s2ki.com/forums/showthread.php?...ht=scrub+radius

sorry i didn't post this earlier..was too lazy...hehe

here's the definition of scrub radius (missing from the discussion):

basically scrub radius is the distance from the centerline of the wheel where it touches the ground to where the steering axis meets the ground. when the steering axis line is on the inner side of the wheel centerline, the scrub radius is positive. when the steering axis line is on the outside of the wheel centerline, scrub radius is negative.

basically the steering axis is the axis of rotation when turning the wheel. the ideal would be 0 scrub radius as this means zero resistance to turning. however, this also means zero feedback through the steering wheel and no "feel" as to how much grip you have. most FWD cars have negative scrub radius and most RWD cars have positive. when you have positive scrub radius, the wheel will want to toe out when the vehicle is moving forward, because the centerline of the tire is outside of the axis of rotation. thus some toe in is required to compensate. by decreasing the offset, you are in effect increasing the positive scrub radius. the result should be more steering "kick-back", and more tendency for toeing out. not sure how this translates to handling however.

also note that if your overall rolling diameter increases (ie going to 18" wheels), your scrub radius will decrease if the offset stays the same.

 

i am totally lost on this. i have 18X8 all the way around. they are axis spiders. the offset is 45 all the way around. the problem is that the front wheels stick out from the fender about a half an inch. is it the offset or what. I don't know what to do??????