X5M/X6M Wheels and Tires Combo Myths - Q&A HERE

[LOW4LYF]

Originally Posted by willzpatron

Hey bud so you're saying if I run 275/35/21 & 315/30/21 on my x5m whose stock set up is 285/35/21 325/30/21, I will have 0 issues and the ride will be the same ? Better or worse in your opinion ?

It's won't be aby better as you using skinnier and smaller tires.

I would go with 275/40 & 315/35 21 to improve comfort.
This combo is used by some forum members.

[JNoSol]

Originally Posted by willzpatron

Hey bud so you're saying if I run 275/35/21 & 315/30/21 on my x5m whose stock set up is 285/35/21 325/30/21, I will have 0 issues and the ride will be the same ? Better or worse in your opinion ?

There's no issue and you cannot tell the difference of added 10mm front and rear.

[JNoSol]

Originally Posted by LOW4LYF

It's won't be aby better as you using skinnier and smaller tires.

I would go with 275/40 & 315/35 21 to improve comfort.
This combo is used by some forum members.

Will look odd. Don't use RFT and comfort will be gained.

[LOW4LYF]

Originally Posted by JNoSol

Will look odd. Don't use RFT and comfort will be gained.

You have no idea!

[JDE92M3]

Originally Posted by JNoSol

Will look odd. Don't use RFT and comfort will be gained.

I agree a NON RFT would be better haha. But options were limited at the time I purchased. I’m coming up on new tires needed again lol, go figure. This time I’m thinking about trying 285/40/21 and 315/35/21. I found great tire options here because Porsche has a lot of cars using this size. This does have a 1% difference where my current setup has a 0%. The car is lowered on Dinan now, and over 10K miles not a single issue or hiccup along the way. Ride comfort although lowered and on RFT is amazing, no exaggeration!



JD

[Blue By You]

Originally Posted by JDE92M3

I agree a NON RFT would be better haha. But options were limited at the time I purchased. I’m coming up on new tires needed again lol, go figure. This time I’m thinking about trying 285/35/21 and 315/40/21. I found great tire options here because Porsche has a lot of cars using this size. This does have a 1% difference where my current setup has a 0%. The car is lowered on Dinan now, and over 10K miles not a single issue or hiccup along the way. Ride comfort although lowered and on RFT is amazing, no exaggeration!



JD

If you're keeping the OEM front, which is most of your concern I would think? Why not keep the OEM rear size? Oh wait, are you on an 11" rear wheel?

By the way, unless there is a typo somewhere, the sizes you mentioned will be 6.9% difference in diameter according to tire size calculator.

[JDE92M3]

Originally Posted by Blue By You

If you're keeping the OEM front, which is most of your concern I would think? Why not keep the OEM rear size? Oh wait, are you on an 11" rear wheel?

By the way, unless there is a typo somewhere, the sizes you mentioned will be 6.9% difference in diameter according to tire size calculator.

Sorry completely did a typo lol. 285/40/21 and 315/35/21 are the sizes should be 1% on the dot. And yes my wheel is a 11” wheel in the rear.

JD

[Blue By You]

Originally Posted by JDE92M3

Sorry completely did a typo lol. 285/40/21 and 315/35/21 are the sizes should be 1% on the dot. And yes my wheel is a 11” wheel in the rear.

JD

Figured so!

Yeah, that's a lot of extra cushion for those wheels.

I never thought I'd say this. But I'm debating using OEM sizes for a new set of BC Forged wheels partially for that same reason. (The 22" setup I like is almost the same exact diameter as OEM, so it's simply sidewall loss.) And because I have two full sets of OEM tires, it just might make more sense as long as I can get aggressive enough with the offsets.

Yours look great so there is hope for me!

[JDE92M3]

Originally Posted by Blue By You

Figured so!

Yeah, that's a lot of extra cushion for those wheels.

I never thought I'd say this. But I'm debating using OEM sizes for a new set of BC Forged wheels partially for that same reason. (The 22" setup I like is almost the same exact diameter as OEM, so it's simply sidewall loss.) And because I have two full sets of OEM tires, it just might make more sense as long as I can get aggressive enough with the offsets.

Yours look great so there is hope for me!

Appreciate it brotha! I’m telling you the ride comfort is amazing! And if this 1% difference isn’t a big deal for the new tire sizes I want. Then I will have a load of all season tires for options which would be nice for my current use haha.

JD

[9vapors]

Any ways to get the new X5M wheels to fit safely? I know they make hub conversions etc, but don't know much about them. Lots of those wheels on EBay for decent prices, however the bolt pattern has been changed.

[JDE92M3]

Originally Posted by LOW4LYF

You have no idea!

And I feel like it looks better as the suspension settled over some decent miles now. Happy to report ride is still great!







*phone app sucks lol*

JD

[Herofmine]

Planing to run Front 275 35 21 and rear 325 30 21, do you guys thick it will be an issues?

[Blue By You]

Originally Posted by Herofmine

Planing to run Front 275 35 21 and rear 325 30 21, do you guys thick it will be an issues?

Should be fine, the tire size calculator I use shows .3% which is lower than the OEM/factory 21" Michelins which are at .7%.

[P1]

Thought I'd add some fun facts here regarding my latest set of 285/325 Michelin Pilot Super Sports...

Installed at 67,397 miles
Replaced at 96,290 miles
Total miles out of a set: 28,893

I really wanted to get to 30,000 miles but I didn't even make 29,000. I could have if it wasn't for the passenger front showing the steel belts on the outside of the tire.

Final stats at 28,893 miles:

Passenger front:
Inside: 3.5/32nds
Middle: 5/32nds
Outer: 5.25/32nds

Driver front:
Inside: 3.5/32nds
Middle: 5.5/32nds
Outer: 5.75/32nds

Passenger rear:
Inside: 3/32nds
Middle: 4.25/32nds
Outer: 4.25/32nds

Driver rear:
Inside: 3.5/32nds
Middle: 4.25/32nds
Outer: 4.5/32nds

[chrises08]

so ive read this entire thread and am still kind of confused on what i can and cant do. i understand that the front to back size ratio needs to be within 1-1.5 percent of each other. i am thinking of upgrading to 22" wheels and found some tires that i like which are the nitto nv420v in a 325/35R22 for the rear and 285/40R22 for the front.

i understand the larger tire size is 2" bigger than factory and that would change the speedometer/actual speed settings but other than that it should not be an issue right?

really would like to updgrade to a 22" wheel and still have a decent sidewall amount while filling in the wheel well gap.

[Blue By You]

Originally Posted by chrises08

so ive read this entire thread and am still kind of confused on what i can and cant do. i understand that the front to back size ratio needs to be within 1-1.5 percent of each other. i am thinking of upgrading to 22" wheels and found some tires that i like which are the nitto nv420v in a 325/35R22 for the rear and 285/40R22 for the front.

i understand the larger tire size is 2" bigger than factory and that would change the speedometer/actual speed settings but other than that it should not be an issue right?

really would like to updgrade to a 22" wheel and still have a decent sidewall amount while filling in the wheel well gap.

Rolling diameter on that setup would be perfect at 0% difference front/rear which is great for the transfer case.

But think about jacking up your M off of the ground by more than 1" due to the increase in overall diameter. You'll get the tire sizes and fender fill, but the height might look a little goofy.

[chrises08]

Originally Posted by Blue By You

Rolling diameter on that setup would be perfect at 0% difference front/rear which is great for the transfer case.

But think about jacking up your M off of the ground by more than 1" due to the increase in overall diameter. You'll get the tire sizes and fender fill, but the height might look a little goofy.

oh i was planning on lowering it too lol figured id go with dinan or something similar to bring it back down to stock height or slightly lower depending on what may fit.

[Blue By You]

Originally Posted by chrises08

oh i was planning on lowering it too lol figured id go with dinan or something similar to bring it back down to stock height or slightly lower depending on what may fit.

Makes sense. Up to you man. The diameter will push it up by 1" and the Dinan will lower it by less than 1". So as long as you're okay with the vehicle technically sitting higher, you should be good.

[chrises08]

Originally Posted by Blue By You

Makes sense. Up to you man. The diameter will push it up by 1" and the Dinan will lower it by less than 1". So as long as you're okay with the vehicle technically sitting higher, you should be good.

Originally Posted by Blue By You

Makes sense. Up to you man. The diameter will push it up by 1" and the Dinan will lower it by less than 1". So as long as you're okay with the vehicle technically sitting higher, you should be good.

I just looked under there and will it not rub the upper control arms/ball joints? Geussing I'd have to get spacers for them lol

[LOW4LYF]

You will run into issues in the front as the tire will most likely touch suspension parts depends on the offsets.

[chrises08]

Originally Posted by LOW4LYF

You will run into issues in the front as the tire will most likely touch suspension parts depends on the offsets.

that is what i thought. i think if i space the wheel out to with the right offset i should be okay. will have to get under there and measure to see what kind of clearance there is from back of wheel and top of wheel to the upper ball joint/control arm area.

[x5mMege]

Waiting for stock, going to try 275 40 r21 and 315 35 r21 on factory 21s.