Is there an official 928 wheel offset thread? Now Post your Wheel sizes and offsets!
#16
Supercharged
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Originally Posted by FlyingDog
Somebody who can prgram needs to make a Miata tire calculator like tool. Instead of just calculating diameter it would calculate distance from the hub inward and outward then compare that to measured wheel well sizes. It wouldn't be a guarantee of fitting, but it would be fairly close.
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Take known fitting combinations and calculate how much room you have. Jim page has 305s front and rear without flaring. Marc Thomas posted how it's done with wheel size and offset. That should be a good start to knowing what fits.
#20
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Okay... I'm now just looking at those pictures. I guess these are based on factory wheels. We need to come up with limits. I may need to do a little survey at SITM....
#21
Drifting
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id keep it to rim size only for simplicity as tyre diameter varies greatly with different manufacturers. i think the rears will be the same for all model years excepting the GTS and barring spacers... and the fronts the same before 86.5 and then again after??
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You would have to account for tire sizes. You could use generic calculations of their size like the Miata tire size calculator. For wheel well sizes you'd have unrolled front, rolled front, unrolled rear, rolled rear, GTS rear and any variation between pre-S, S, and S4+ suspension dimensions. I think stock ride height could be a safe assumption.
#23
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our Australian colleagues have done a lot of work on this topic
http://www.landsharkoz.com/tt/ttwheels.htm
Marton
http://www.landsharkoz.com/tt/ttwheels.htm
Marton
#24
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Originally Posted by Andrew Olson
Here, I think I found it. Thanks to 928org.uk ![jumper](https://rennlist.com/forums/graemlins/jumper.gif)
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#25
Burning Brakes
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Originally Posted by Andrew Olson
Okay... I'm now just looking at those pictures. I guess these are based on factory wheels. We need to come up with limits. I may need to do a little survey at SITM....
![bowdown](https://rennlist.com/forums/graemlins/bowdown.gif)
I promise I'll donate to the shrine if you do!
![evilgrin](https://rennlist.com/forums/graemlins/evilgrin.gif)
I'd like to know what will work and what won't in an aftermarket wheel when the time comes. Trying to figure offsets out has made my brain hurt thusfar...
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#26
Racer
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Andrew, I'm thinking the same thing. 5-spoke, no twist, 18".
I just want someone to tell me what to use!
The aussie info is good from what I've read. They talk about not going less than 55mm ET on the fronts or there may be handling problems. So it's not just what will fit under the fender.
I just want someone to tell me what to use!
The aussie info is good from what I've read. They talk about not going less than 55mm ET on the fronts or there may be handling problems. So it's not just what will fit under the fender.
#27
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In the morning I am going to try to draw something that is clear. I will just have to find some dimentions for the suspension components so that I can determine the arc that the wheel travels on in reference to the fender lip.This will give us an absolute dimension without spacers or offsets.
#28
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Originally Posted by greg928s4
Andrew, I'm thinking the same thing. 5-spoke, no twist, 18".
I just want someone to tell me what to use!
The aussie info is good from what I've read. They talk about not going less than 55mm ET on the fronts or there may be handling problems. So it's not just what will fit under the fender.
I just want someone to tell me what to use!
The aussie info is good from what I've read. They talk about not going less than 55mm ET on the fronts or there may be handling problems. So it's not just what will fit under the fender.
#30
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After re-reading the OZ pdf, I am thinking my 8x17 et70 front wheels could use a 5mm spacer to get back to 65mm offset. I thought I had an ideal front wheel, but now not so. Hmmmmmph.......