19 vs 20 for Stage 2

[TTR]

I have a new one 2017 m3 ZCP,

stock wheels are 9x20 and 10x20 666m (black)


I will go to Stage2 with 600whp and will need to change wheels for sure

i decided to order HRE 101 LW model, but can't choose a right size wheel and tires

I have 2 option


1 - 19

9.5x19 front with 265-35-19 tires

11x19 rear with 315-30-19

There are 2 question

1)CCB - is it possible to 19 on Ceramic brakes
2)Am i will take some problems with 315 width? If i will go to 305 - the sizes of the back wheel will be less than original and the profil width no so high

2 - 20


9.5x20 with 265-30-20

11x20 with 305-30-20


What is the best option for max grip?

[AhsanU]

Which tyres are you thinking about?

315 tyres can fit, but only given the right offset and suspension.

Will the car be daily driven? Is aquaplaning a worry for you, or are you only worried about gripping?

To answer your question, the best grip will be had from R compound tyres. So Nitto NT-01, MT Street S/S, Michelin Pilot Sport Cup 2, Toyo R888R, etc. A stickier tyre will serve you better in terms of grip, but has obvious drawbacks that include accelerated wear, loss of aquaplane resistance, tyre noise, and so forth. So it depends on what you're willing to forego to obtain grip.

If you're thinking about pushing 600whp, you may want to consider stickier tyres rather than wider. An R888R/MPSC2 at 285 width is better than a PS4S at 305 width.

You won't run into issues with a 305 on most tyres out back, as long as you dial in some negative camber.

[TTR]

I want to use r888R or Cup2, actually i have Advan Neon Nova R on my old 330d e46 bmw with almost 400hp and a lot of torque - like that and there are no any problems on wet

For the fist - i have to make a choose 19 or 20 wheel


Car is for everyday use, not for the racing.

So you think is better to go 305 on stick tyres on the back?


If i will go to 305, there are following options

19x11 with 305-30-19 or 20x11 with 305-30-20

What is the best option?


Also i thought that 315 gonna fit without any probnlem, just with right negative camber

[TTR]

Also, i am worried about height of suspension changing when we put higher or smaller sizes of all wheel.

For example:
285-30-20 (stock) has a 679mm diameter of rear wheel
305-30-19 has 666mm
295-30-20 has 685mm
305-30-20 has 691mm


So what is the best solution in these case? Lower or higher?

[TTR]

Front wheels

Stock 265-30-20 - 667mm with profile width 80mm
265-35-19 - 668mm with profile with 93mm

93mm profile is seems to big on front? isnt it?

Cuz on rear the profile width will be 92mm (less than in front)

In stock the profile width on front is 80 and 86 on the rear

[TTR]

If we go further - i ordered an Eibach springs, so the car will be lowered

For ZCP we see 0.8 front and 0.5 rear

so the difference between front and rear 0.3 and we can use a smaller size of the rear wheel to compensate and use 0.3x2 - 0.6 lezz size of rear wheel to keep stock paramaters of suspension?