20" Staggered Tire Sizes?

[22MAVXLT]

I am finally going to switch it up on the S550. Swapping the D5's for some new 20's. I won't divulge the new wheels yet, as they are in the works and a new wheel for 2025. I won't even have them until December of this year. But they will be 10" on the front and 11" on the rear, and fully forged. I am new to 20's on any car, the biggest I have ever ran was 19's. So I am looking for tires already and need/want some recommendations. Mostly on sizes. I don't want the "stretched" look.

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[WD Pro]

I’m also looking at 20’s, the below are pretty close to standard PP1 sizes :

F = 255/40 ZR 19” 688.34mm
F = 285/30 ZR 20” 680mm

R = 275/40 ZR 19” 703.58mm
R = 315/30 ZR 20” 703mm

WD

 

[skinnyb]

I ran 275 35 20 and 305 30 20 on mine when I had 10 and 11 wide wheels. Came as a combo from LMR and it fit real nice and looked good...

 

[MAGS1]

285/35 front
305/35 rear

Can also do 315 in the rear. 275/35 in front is fine but your sidewall does start to get a bit short.

I run 285/35 on 20x10 all the way around as an FYI

 

[Ballistica]

I run 20x10’s with a squared setup with 285/35/20. I’m on Eibach lowering springs.

 

[22MAVXLT]

285/35 front
305/35 rear

Can also do 315 in the rear. 275/35 in front is fine but your sidewall does start to get a bit short.

I run 285/35 on 20x10 all the way around as an FYI

305/35 on the rear? Aren't those too tall?

 

[MAGS1]

305/35 on the rear? Aren't those too tall?

It’s a bit tall yes but it’s doable, there are quite a few folks here that run that size. If you go to 315’s I would do a 30 profile and not 35.

This is a good site to compare sizes. Size 1 is your original size from factory, Size 2 is your new size. General rule of thumb is within 3%. Anything outside of that starts to have an effect on gearing, speedo, etc.

https://tiresize.com/comparison/

 

[gsxr1300]

315/35-20 fit great in the rear.

 

[MAGS1]

315/35-20 fit great in the rear.

It’s more the size relative to stock. It’s a pretty tall tire.

 

[gsxr1300]

Yes but it's easy to fix the speedo.

 

[22MAVXLT]

My stock 19's had 255/40 on them I believe. My D5's are 255/45/18 up front and 295/45/18 on the rear which is super tall. It gave me the look I was wanting. Now, I'm getting away from the drag look. But I'm pretty sure the stock tires were 27.05" tall.

 

[Weeee]

My D5's are 255/45/18 up front and 295/45/18 on the rear which is super tall.

Would you post some photos of your setup, especially around the rear? I got a pair of 18x10 Welds for drag radials to pair with my 20x9/20x10.5 Weld set-up. I'm running Falken FK510s 255/35 and 295/35. , and I recommend these tires.

 

[S550_GTCS]

This is a 275/35 and a 305/35 on stock hide height.

The below is 275/35 and 305/30 lowered on Steeda progressives.

 

[22MAVXLT]

 

[coyote550]

Forgestar F14's deep concave.

Front: 20x9.5 +29 - 265/35/R20
Rear: 20x11 +56 - 315/30/R20

The front wheels did tuck in a little more than I like but some 10mm spacers fixed that. I would like to go wider in the front but also want the sidewall and diameter nearly identical so that's the size I settled with. Only 0.4% difference in diameter and exact same sidewall.

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