Wild E. Coyote said:You are forgetting that we are talking 6,5" wheels here. ET (EinpressTiefe, press-in value would be a rough translation from german) or offset of 34 mm means that your pickup point if the wheel in question is translated by 34 mm to the outside leaving you with 42,2 mm of wheel on the outside. As the width of your wheel is 6" (152,4 mm) inside you have 110,2 mm.
Now, if you use 6,5" wheel (165,1 mm) with ET40, you would get almost identical 42,55 mm on outside and 122,55 mm on inside.
To sum it up: it would look almost identical and shouldn't affect driving quality at all. As Ian G pointed out, you want to maintain the same scrub radius, and as the outside width value of your wheel is different for 0,35 mm it is practically the same.
If this is confusing, I can add some drawing to clarify it
cj2013 said:Wild E. Coyote said:It isn't confusing at all, as I am degree qualified in an area which includes this subject - I haven't used the vehicle dynamics (suspension & steering geometry) side for a couple of years so I double guess myself.
My confusing is that the mathematics of it makes sense, but there are conflicting posts.
To an extent, you have contradicted yourself here with what is posted in http://www.projectpuma.com/viewtopic.php?f=20&t=20988&hilit=et40, saying that you should stick to the same offset?
Also Dal here:
http://www.projectpuma.com/viewtopic.php?f=20&t=18055&hilit=et40
a topic here:
http://www.projectpuma.com/viewtopic.php?f=20&t=17312&p=219461&hilit=et40#p219461
I know that it shouldn't make much difference on paper, but people are saying that it ruins the car's handing. I'm just wondering why, if that's true, Ford offered the option?
cj2013 said:I know that it shouldn't make much difference on paper, but people are saying that it ruins the car's handing. I'm just wondering why, if that's true, Ford offered the option?
cj2013 said:Perhaps.
As I've told you already, I fancy some of the Cosworth alloys.. found quite a few of the 16's, less of the 15's, all obviously in the common ET40 x 6.5J...
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