Conti Challenge Z34 Wheel sizes

BGTV8

Remember, I have a sequential box with 1:1 6th gear, with choice of 3.9 or 4.08 FD, so rolling radius is slightly less of an issue, and yes, I am expecting ~480-500hp at the crank (14:1 on E85 with C12/RZ1 profile cams).

I have a set of 18 x 9.5 PF01 at ET35 and run 0.5" spacer in front (effectively ET22), with 1.0" spacer at the rear (effectively ET10) and with 275/35R18 R-Specs, I have 2-3mm of poke at current ride height on -3.0 degrees. This is about all I can get away with at tech, any more poke and I get defected.

If there is sufficient room to extend the inner rim half the full 25mm, then the equivalent in 10.5 wide should be ET35, which is why I'm confused that a 18 x 10.5 ET15 will fit on the front (I'm less concerned at rear fitment).

Here are photo's of trial fitment of 18 x 10.5 ET15 on the front at ride-height (is fitted with 295/30R18 Dunlop DZ03G which is "about" the same size OD as my planned slicks).

To clear tech, I am going to need bodywork changes based on these photo's which is going to bump me out of my planned class and into GT3 territory and I'd like to avoid that because F458GT3, Gallardo GT3 and 997 GT3 are just too bloody fast !!!

I cannot imagine there is any LHD/RHD differences in play, nor the fact that our cars down-under are manufactured in Japan and the US cars in Tennessee, so I am a little confused at present.

Clearly, some more research is required.

I'll get there but is chewing up some time.

Attached Images

	18 x 10_5 ET15 Front 1.jpg (115.4 KB, 33 views)
	18 x 10_5 ET15 Front 2.jpg (73.6 KB, 29 views)
	18 x 10_5 ET15 Front 3.jpg (115.4 KB, 24 views)