Quote:
Originally Posted by SEAT TIME RULES
I don't have a choice unless I buy 4 more rims. I have the SM-10's now and the only size they have in 10.5 or 11" is the 19x11 ET44.
I did the math:
Front setup is the 18x10 ET33 with 12MM spacers and 265/35 A052's.
Tire Diameter=25.4" /Sec Width=10.6
Going to 275/35 NT-01 = 25.55 & SW 10.91" so almost identical diameter and .31" overall ....0.155" more inside and outside.
Rear setup now 18x10" E33 with 295/35's
Tire Diameter=26.2 with SW=11.8
Going to 19x11" ET44 with NT-01 305/30/19's
Diameter=26.26 (same) and SW=12.32 (0.48" more) or 0.24" inside and outside.
With the 44 vs 33ET's 33mm=1.30" 44mm=1.73" , So 0.43" more inboard.
So 0.07" further out with the rims and the tires would be 1/4" more.
I've got the camber shim kit and can take the tabs out and roll them also.
I don't want to add anymore Neg camber than needed in the rear. I'm at 2.0 right now...
Sounds really tight...
|
Yeah, did all the same math, along with measuring off my 19x10.5" ET45 305/30/19 setup before deciding to go with the 18x10.5 ET40 vs 18x11 ET44. Plus, I wanted the EC-7R, so that ruled out the 18x11 Apex options.
Either is going to be such a tight fit for a 305/35/18 on a lowered car running -2.0-2.1 rear camber that I didn't want to risk the 18x11. A 305 is a 305, but the 10.5" rim will pull in the sidewall a little, giving a couple more mm clearance and I think that couple mm will be necessary to not have to do fender work other than trimming the tabs.
Essentially I'm estimating that the 18x10.5" ET40 will provide 3-4mm more fender clearance than the 18x11" ET44 with a 305/35/18, which is a lot considering how tight we're talking about. If this had been a normal track year, I already would have tried the 18x10.5" and 305/35/18 so we'd all have an answer.
All this said, I hope the 18x11 ET44 works, as that would be a great fitment. I'll follow up with a link to some pics for visuals on my previous setup that I've been measuring from.