275/35/20 Front and 305/35/20 Rear, is it possible?
 

Need help with wondering if I should use 305/35/20 or 305/30/20 in the rear and same with the fronts, 35 or 30. (Just thinking of using 35 ratio all around that's why.) Would like to hear if possible, thx.

If I was to do it & had 1" staggered wheels; I would choose 285/30,305/30/20
26.8/27.2" diameter. Less likely a chance of Christmas tree effect & speedometer will be close to perfect.
35's are tall & unsure turning abilities...+ speedometer will read slower than actual speed.
Usually can get by with 2 width size's & same series wheels...also unsure the look of a tire almost 3/4" taller (3/8" more sidewall showing in back).
Just my thoughts...as mine are 26.8"F,27.2"R on 19's with no issues.

Thanks for the response, guess I'm just gonna do the 305/30/20 rear then instead of 305/35, I just figured like to even out the ratios and just have a width difference but I dunno.

there's no need to "even out the ratios". This isn't baking

Tire diameter is what needs evening out.

275/35/20 is 27.6 inches. OEM front is 245/40/19 which is 26.7 inches. You are nearly
one inch taller than stock

I suggest either:
275/30/20 F, 315/25/20 R
or
285/30/20 F, 325/25/20

This is given your desire to run a good amount of tire in front.

Most folks run 265/35 F, 305/30 R in 19 inch sizing

I have 275/35/20 and 315/35/20 but i have the niko wide body kit which is pretty damn wide. I also have 20mm spacers in the rear to make it herra frush..

I have a better question: What size and offsets are the wheels you have or plan on getting? Everyone is throwing sizes out without knowing how wide they actually are and whether you want a stretched or meaty looking setup, much less how much room you have to work with.