So this is the 285/35 18 on a 9.5 +45. Will need a trim or roll as its way over size at 25mm bigger than the 275!+


This is the 275/35 on the same rim. Fits great, 5mm+ clear of the control arm, and at full locks L&R. Stock height btw.


I wont be messing with bodywork, going with Toyo R888Rs in 275/35 in the rear.

This is a 275 next to a 285. Same tyre type on the same wheel! Even if it was 15mm bigger that would have worked. Be careful people...

 

Which Michelin tire is that?

 

Pilot Super Sports. I recognize those beefy shoulder blocks. :-)

 

I'm looking to get 265/40/18 square set up sometime in the future for a nice balance of smoother ride with good grip. 265/40/18's seem to have the most sidewall you can get, which I really want considering how bad NYC area roads are. What would be the optimal rim width and offset for that?

 

I run that on my fronts in a 9.5 wide rim, and it fits well with wider Michelin tires. It’s also very smooth on OEM 13 suspension.

 

What's the offset?

 

Correct, PSS is my tyre, which begs the question, what 285/35 are you running? I found your pics(nice cols btw) and your rears look much narrower.

 

45

Thanks, my rears are 285 Nitto NT555R drag radials. They are the perfect drag radial for our car, as they have plenty of grip, but also last a long time and handle relatively well in the wet. That said, it’s narrow for a 285 drag radial. After I burn them up, I’ll buy 265/40 for my rear to match my front for road coursing. Drag radials are a no go for a road course.

 

You keeping saying that. Hurry up and get on the road course man! Just kidding
All of the fitment questions is why I went with the tried and true setup of 18x9.5 +45 with 275/35-18 RE-71Rs.
I'm lowered about 1.5-2 inches on coils with no rubbing on the street. There is one spot at Mid Ohio track where I very briefly rub but not a big deal.

 

Need some feed back guys. Some of you are aware that I had an accident at work that caused some pretty severe cervical and Lumbar damge requiring Fusion surgies. In order to continue to drive my ISF I had to revamp suspension. To make it more complaint on these bad NY roads. To that end. I removed KWv3 coilovers installed Airlift 3H suspension, removed RR Racing LCA and went with Figs LCA. I want to run 275/40/18 square set on 9.5 concave rims. By going with taller side wall combined with Airlift suspension this should give me what I need. Could use some advice on what would be best offset. I want have tires as close to inner fenders as possible but still be able to air the car out when its parked. So No poke zone lol. Chime in based on offset that were posted up pick your fav and why.

 

Hear some diagrams of different all sets let's start with the front tires

 

Sorry to hear about your injuries. Back injuries are never easy to deal with.

Regarding your question about offset, i would stick around +38 (max). Obviously in the low to mid 40’s for the safest offset.

Im running 275/35/18 squared at +35 and im pretty flush if not kinda poking.

What tire were you planning to run? I believe that also has a factor in how much clearance you have regarding the shoulder of the tire

 

My concern with 275/40s is rubbing on the inside and outside. I don’t know what the inner suspension piece is called that runs parallel to the wheel / tire (directly up and down), but it curves toward the tire the further up that you go. My 265/40s run pretty wide, and there isn’t a ton of inner clearance on a 45 mm offset. To run a 275, a 40 mm would be safer. However, at that tire height, you may get into the fender liner, and maybe even on the outside lip if you go to low on offset. For that reason I wouldn’t go lower than 40.

If your set on a 275, I think a 40 mm offset would be safer than a 45. You may need to do some trimming based on ride height.

the 265/40s do ride nice, and some of them come pretty wide (similar to narrower 275s at 10 inch tread width).

 

Wait dude, aren't you USB_IS500 on insta? I've liked a **** ton of your posts and you're on my discover tab on the reg

 

Thanks for input JC, really appreciate feed back. My concerns is more outer sidewalls being to close to fenders. 45mm is actually closer on inner side wall. The tire height isn't problem, I'm on air so I can ajust height at touch of button I'm on 255/35/19 F & 275/35/19R at rear I'm 26.6 no rubbing anywhere in rear. I was looking at 40mm as well. Tire selection is going to be important, we all know how tires are never same especially when it comes to width. Look at Michelin they are know for being much wider than what there spec indicate. I'm not married to 275, Theoretically 275/40/18 and 265/40/18 should be roughly 0.31 or 1.2% different in diameter 26.35 to 26.66 and 0.39 or 3.8% different in width 10.43 vs10.83 in and sidewall difference of 0.16 or 3.8% 265 sidewall of roughly 4.17 on 275 sidewall of 4.33. I'm looking for over 4in side wall so 265 should technically give me what I want which is 4in sidewall or better. I need to decide on tires and get the actually measurements not theoretical measurements.