Upgrading 458 wheels & lowering - any issues w E-DIFF or getting camber adjusted?

As long as you don't change the front to rear diameter bias, there's no electrical issues. The issues that can be, are not with the E-Diff, but with the ABS sensor, as it senses the front and rear wheels speed compared to each other. The car don't know how wide the tyres or rims are, nor does it know what the overall diameter of either is. It only knows if there's a difference in wheels speed between the front and rear axle.

This means that 325/30R21 rears will work with 255/35R20 fronts. The really neat thing about this tyre size compared to 355/25R21 in the rear is that not only can you run Michelin PSS tyres instead of Pirelli PZero, which you will find most on the board think is the best tyre by far(me included), but the bias between front and rear tyre grip will be much closer to stock, i.e, much less understeer compared to putting massively wide rears with close to stock width fronts. Let me explain in detail.

The 458 comes with MPSS tyres from the factory with tyres that has a front tread width of 9" and a rear tread width of 10.6". That's a difference of 17.8% front to rear.
If you use the 255/35R20 K2 MPSS for the F12 which has a tread width of 9.2" and the 325/30R20 which has a tread width of 11.3", the difference will be 22.85%. This will of course add a bit of understeer as the wider rears will make the car push more - but it will not be much.
If you use the 255/35R20-355R21 Pirelli combo some use, you will have fronts that has a tread width of 10" and rears with a 13.5" tread width. That 35% front to rear difference is double that of the stock bias and will change the handling characteristics significantly.

If you're only cruising, it won't matter much. But if you like to run your car through its paces, let the rear hang out a bit etc. I'd go for the 325/30R21 setup over the 355/25R21. Both have the same diameter btw.

As for fitment, not sure how it's done. Some say they rub, some say they don't. I guess it's all about hitting that right offset and maybe slight modifications to the fenders and fender wells.

Good luck.

 

Wow, I was just looking for similar information.

I am curious about camber adjustments too. It seems the car does have the ability to remove any negative camber associated with lowering as I can swear I've seen 458's lowered with normal looking camber settings. I just can't confirm for sure...

 

Not sure what backspacing has to with anything. The offset will determine how far in or out the wheel sits. Offset is measured from the center of the rim to the mounting flange of the rim. Are you thinking that the backspacing of the 12.5"x22" wheel will push the wheel further out in the wheel arch compared to a 12"x21" wheel? This all depends on the offset. The outer lip of the two wheels can be places in exactly the same locations as long as the wheels have custom specified offsets - which is usually the case with HRE. I've added a pic below to show how offset is measured.

Forget the calculators. They don't tell anything about actual tread width or tyre size for that matter. They put a tyre in a class of sizes, but section width, tread width and diameter can vary from brand to brand, model to model, OEM model and depending on rim width etc.
If you want the data of a tyre, look up the manufactures specs.

The tread width, the part of the tyre that actually hits the pavement is specced as I posted, as per Michelin and Pirelli specs.

The tyre size you have been suggested and is the common size used for the 21/22 setup on 458's, has the same diameter as the ones I mentioned as a 20/21 suggestion. 27.1" for fronts and 28.7" for rears and they only come as Pirelli Pzero tyres. The tread width for the 255/30R21 fronts are 9.5" and the tread for the 335/25R22 is 12.1". This means a tread width front to rear bias of 27.4%. Apart from the added weight and the larger diameter acting as a longer final drive diminishing performance, it's not something I'd use for serious driving or track days on a car that already pushes. But it seems fine for cruising just avoid pot holes. Also, the combination of increased tyre width and lower profile will create a harsher ride.

Personally I'm not a fan of the huge wheels look and I'd never put them on our spider, but it can be done. I've seen reports on rubbing, but others have no issues. Getting someone who knows what they are doing to make sure correct offset is used is key I guess. Ask the shop that you've been in contact with if they have actually done the install before with ZERO issues. Nothing worse than a high end luxury car that has annoying rubbing issues comparable to a souped up Honda.
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All good information.

As a side note, the 22" rear sizes would only be 1/2" taller than the OEM size, that wouldn't hurt straight line performance at all. That is the difference between a worn and new tire.

Also, as for weight differences, it depends on wheel choice. If you get a very high quality, forged wheel, even in a 22x12ish size, it has the potential to weigh less than the factory wheels. The ADV.1 Track Spec SL series for example, are super strong, and light weight. Pretty sure my friend who has these said when he weighed them that they were about a pound lighter when compared to his OEM wheels.

 

My car has 255/30/21 fronts and 355/25/21 in the rear. The car will not run cause the sizing is Off. any ideas on how to run these tires??

 

I lowered a 2010 458 Italia, usin H&R springs...and put spacers on all 4 corners. It looked amazing. Ended up lowering it just over an inch, along with the spacers (I think they were 15mm) it looked perfect. No need for wheels. I would do that first then make the call on wheels. Side note: the springs made the ride a little stiff...had to use bumpy road mode more often with the wife in the car.

 

If you PM me your email, I can send you pics.

 

According to Tire rack the 325 30 21 michelin tire is 28.7" (11.3"width)diameter and the PZero 355 25 21 is 28.1"(13.5 " width). The stock Michelin tire 295 35 20 Ferrari spec is 28.1 and 12" width! So the Michelin tire 325 is .6 bigger in diameter and .7" narrower then the stock rear tire. So only the stock front tire and the Pzero 355 21" would maintain exact diameters as stock wheels and tires. So should I go this route? Stock tire up front and 21" Pzero 355 25 21 rears! Huge width difference!

 

OEM wheels always look better.
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Let's just agree to disagree haha

But in all seriousness, both look good. With the aftermarket HRE's though you get a more lightweight wheel and the ability to have a wider setup which allows for the monster 355 rear Pirelli's seen here.
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Woow these high (w)heels look good !

 

Hahah, I see what you did there

 

Both are Great looking set ups ;-)