Forced Induction tire / rim selection

On my 2015 Base, I'm running a Nitto 555 G2 315/35R17 on an American Muscle 10th Anniversary Cobra Style 17 x 10.5 wheel. That's the narrowest wheel Nitto recommends for a 315 tire. 11 is best. The drawback is the 28 mm offset causes the tire to center over 1" to the left. I haven't noticed any handling problems. I'm considering getting a stock rear wheel widened by 1-1.5" and mounting a 305/30R18.
Somebody else is running a 295/45R?18? tire. Don't remember what size wheel, but he claims the extra sidewall gives more flex for better traction. He had his ECU reflashed to the SL wheel info so his speedo/odometer work properly.

Quote from Casey_SS

I've be scouring around looking for what people consider great combinations of tire / rim to hook that extra power up to the pavement.

The consensus for tire seems to be the NITTO 555 as listed in this poll

What size rims fit well and perform well for the people that have added the extra horsepower that doesn't throw codes?

I've seen some people go with a smaller rim in the rear with a higher sidewall on the tire. Some shoehorn a wider tire on a stock rim that may not be safe.

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I would say your best bet is adding an extra wheel back there, but that's a major mod.

I think both @MACAWS and @Slingrazor have figured out that they like it best with the smaller wheel/larger sidewall combo. Not sure about their specifics, but the theory makes sense to me. Kind of like watching the funnycars on the dragstrip...when those rear tires wrinkle on the sidewalls, you know they're digging in for max traction with the power going into the wheel.

I am running a Michelin Pilot Super Sport 345/35/20 and a Alpha Supercharger. Had these wheels and a couple rear tires on 3 different SS's and no problem with rubbing. The taller sidewall makes for a smoother ride. Running the same brand and sidewall size tires on the fronts 255/35/20. With adjustable shocks you can get a very nice comfortable ride on the highway and no problems playing in the curves when you tighten down the shocks.

Quote from Tim0341

I am running a Michelin Pilot Super Sport 345/35/20 and a Alpha Supercharger. Had these wheels and a couple rear tires on 3 different SS's and no problem with rubbing. The taller sidewall makes for a smoother ride. Running the same brand and sidewall size tires on the fronts 255/35/20. With adjustable shocks you can get a very nice comfortable ride on the highway and no problems playing in the curves when you tighten down the shocks.

Nice setup, man. Looks good.

No issues with the nanny systems with the slightly taller tire?

I have rubbed a little (not bad) on my Welter exhaust. If your not running duals out the back you should be able to go with a taller wheel/tire.

I got mine from roaring toys. 19” all around with a 12” wide rear. I went with the Hankook ventus v12 evo2 325/30/19. I know I saved a lot of weight going with forged wheels.

As I mentioned earlier, I currently run a Nitto 555 G2 315/35R17 tire. I think it looks good and with some throttle control, I can start from a stop w/o excessive wheel spin, yet it is way too easy to spin my rear tire in 2nd or 3rd gear. Generally speaking, wider tires bring with them a lighter loading per sq inch of tire footprint. There's a relatively low amount of weight on the rear tire and increasing the tire's width will also bring with it the risk of increasing wheel spin simply because of lighter tire loading per sq inch of contact surface.
That's probably a contributing factor for those who keep a standard tire width and go to a taller tire feeling it helps their traction.

15 psi tire pressure on a tall sidewall.
Soften up the shock by reducing the rebound.
This will let the weight transfer to the back a little more and help the sidewall flex.
I WOULD NOT run 15 psi if you have a narrow sidewall.

The Slingshot's low CoG makes it hard to have much weight transfer to the rear tire compared to conventional vehicles with higher CoGs, or so I have read.

You are probably right.
I am done.

Quote from Slingrazor

You are probably right.
I am done.

Wasn't trying to be critical regarding the CoG. Softening the rear shock will definitely help some with weight transfer, but there isn't a whole lot of weight to be transferred.

At a track like the runway or a drag strip I use a Mickey Thompson drag slick. And on the highway I run nitto fusion fronts and something like an all season Michelin or nitto on the rear

Quote from Casey_SS

@TimC Where exactly did you rub with the WP duel?I have the duel exhaust myself

Rubbed the pipe behind the tire. Not bad but you could see a black mark on the pipe. I had the shocks set real loose, I tightened them up a few clicks.

Anyone ever get the price of the 4 wheel conversion?

Quote from BKL

As I mentioned earlier, I currently run a Nitto 555 G2 315/35R17 tire. I think it looks good and with some throttle control, I can start from a stop w/o excessive wheel spin, yet it is way too easy to spin my rear tire in 2nd or 3rd gear. Generally speaking, wider tires bring with them a lighter loading per sq inch of tire footprint. There's a relatively low amount of weight on the rear tire and increasing the tire's width will also bring with it the risk of increasing wheel spin simply because of lighter tire loading per sq inch of contact surface.
That's probably a contributing factor for those who keep a standard tire width and go to a taller tire feeling it helps their traction.

interesting, I had never even considered that the lighter loading per sq inch could be enough of a factor to out weigh the benefit of having a larger footprint.

perhaps someone should invent a system with a cylinder of highly compressed gas like a scuba tank mounted in the passenger storage area with a high pressure line running to a nozzle pointing straight up mounted on the swing arm. Then use an electronically controlled valve tied to the throttle to fully open the tank creating a jet that would put a huge amount of down force on the rear tire until the tank is empty.

Silly idea, but if it could be done you might be able to greatly increase the rear tire traction for the time it takes to get to a speed without adding weight or creating drag

I know - probably could never be done or wouldn't work, but it was just a weird idea I got after watching videos on you tube of people knocking the valve off of a scuba tanks and seeing how much force there is and I thought it might be neat if that force could actually be used for something

scuba tank valve cut off

As you can tell, when my wife is at work at night I have way too much time on my hands - watching scuba tank videos