Ordering Tires: Please Double-Check My Math

[Roadway 5.0]

Good Morning,

I am ordering tires for my MRR FS02 20"x10" and 20"x11" wheels and am seeking a second-check on my math. I'm ordering:

Michelin PS4S 275/30/20 Fronts (26.5" Diameter)
Michelin PS4S 305/30/20 Rears (27.2" Diameter)

My original wheels/tires were the performance pack bits measuring at:

Pirelli Pzero 255/40/19 Fronts (27.0" Diameter)
Pirelli Pzero 275/40/19 Rears (27.7" Diameter)

Here is where I need the double-check on math. With the diameters listed above, my going with 30 series tires on 20" wheels will reduce the overall wheel/tire diameter by 0.5" for both the front and rear. This means that I will increase tire to fender gap by 0.25" respectively...correct? I'm fairly certain I'm spot on, but would love to hear your opinions before I pull the trigger on such a large purchase. Thanks,

- Mike

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[Nagare]

Math looks spot on to me, wheel gap would probably be closer to mine then.

 

[Roadway 5.0]

Math looks spot on to me, wheel gap would probably be closer to mine then.

Thanks for the feedback bud; your garage photo of your car is awesome. The wheels and tires you picked are perfect

 

[BlownGP]

Yup, you will have a little more fender gap with those sizes, but looks like your math is right

 

[aleccesarenriquez]

You might consider a 285/30 for the front, depending on the offset of your wheels. I'm running 6gr 20s w/ that size in the front (1.2" drop) and I think it looks pretty good. I think a 275/35 would look better, but I'm running a 305/35 in the rear and the gap is exactly the same in the front and back for me (0.5" drop in the rear). The best "look" would probably be 275/35r20 and 315/35r20 rear with coilovers to set the height perfectly.

 

[Roadway 5.0]

You might consider a 285/30 for the front, depending on the offset of your wheels. I'm running 6gr 20s w/ that size in the front (1.2" drop) and I think it looks pretty good. I think a 275/35 would look better, but I'm running a 305/35 in the rear and the gap is exactly the same in the front and back for me (0.5" drop in the rear). The best "look" would probably be 275/35r20 and 315/35r20 rear with coilovers to set the height perfectly.

You must have read my mind. I'm stuck in between ordering 275/30/20s or 285/30/20s for the front. Not a huge difference between the two, and I'm sure both will fit fine on a 20x10 +35, but nevertheless I am in debate. Any rubbing issues at all with your 285s? Even at full lock? Thanks,

- Mike

 

[aleccesarenriquez]

No rubbing issues whatsoever. It is my daily as well so I go over large speedbumps and steep inclines all the time and don't think I'm even close to rubbing. At full turn both directions, I still have plenty of space, and about a 1 finger fender-tire gap when centered. They are still shorter than stock at 26.7, but at least you'll be closer to stock tire height.

 

[BlownGP]

You must have read my mind. I'm stuck in between ordering 275/30/20s or 285/30/20s for the front. Not a huge difference between the two, and I'm sure both will fit fine on a 20x10 +35, but nevertheless I am in debate. Any rubbing issues at all with your 285s? Even at full lock? Thanks,

- Mike

Either one will work fine. going from 275 or 285 is a toss up.

Me personally. I would like a 285 because 275 with that wide of wheel is leaning towards the stretched look. Which to me only looks good if you are tucking fenders.

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