Tire size question

RoWoX3M · 09-25-2020, 02:08 PM

Has anyone done 255/45/20 and 275/40/20? I'm looking to go this route with aftermarket wheels. Instead of the rears being 1% taller than the fronts they would be 1% shorter. So 29/29.3 vs 29/28.7. I don't think there's any problem but wanted to check with the wise and all knowing. Thanks.

suby01 · 09-25-2020, 05:39 PM

With those sizes youre exactly at 1% difference so you are OK to go with that setup. As long as you are 1% + or - with the F and R sizing specs you are fine to use it with the BMW X drive.

Link for reference I was just shown earlier this week for anyone interested for other sizes.

https://tiresize.com/comparison/

ltym5 · 09-25-2020, 09:10 PM

Quote:

Originally Posted by suby01

Link for reference I was just shown earlier this week for anyone interested for other sizes.

https://tiresize.com/comparison/

How about 255/45/20 f and 295/40/20 r?

suby01 · 09-25-2020, 09:14 PM

Quote:

Originally Posted by ltym5

Quote:

Originally Posted by suby01

Link for reference I was just shown earlier this week for anyone interested for other sizes.

https://tiresize.com/comparison/

How about 255/45/20 f and 295/40/20 r?

Same thing. Thats +1%. First choice was -1%. Here is how to use this super simple chart below.

Will Pwr · 09-25-2020, 10:21 PM

Quote:

Originally Posted by ltym5

How about 255/45/20 f and 295/40/20 r?

Im currently running 265/45R20 and 295/40R20 and there are no issues as well. Technically 255/45R20 fronts would have kept that 100% status quo, but I wanted a meatier tire up front.

Edit- quick pic attached

AlexFL · 09-25-2020, 10:36 PM

Quote:

Originally Posted by Will Pwr

Im currently running 265/45R20 and 295/40R20 and there are no issues as well. Technically 255/45R20 fronts would have kept that 100% status quo, but I wanted a meatier tire up front.

Edit- quick pic attached

how do you like the ride quality with the new wheels?

Will Pwr · 09-25-2020, 10:45 PM

Quote:

Originally Posted by AlexFL

how do you like the ride quality with the new wheels?

It's good, but at the same time I never really had issues with the stock 21" wheels either. The added sidewall and width of the tires I'm sure made it more compliant of a ride, but the biggest difference is probably the weight reduction. I haven't been able to personally weigh both sets, but based on calculations it's about a 12lb reduction per front and 13.5lb per rear.

suby01 · 09-26-2020, 12:03 AM

Quote:

Originally Posted by Will Pwr

Quote:

Originally Posted by ltym5

How about 255/45/20 f and 295/40/20 r?

Im currently running 265/45R20 and 295/40R20 and there are no issues as well. Technically 255/45R20 fronts would have kept that 100% status quo, but I wanted a meatier tire up front.

Edit- quick pic attached

How wide are the wheels F and R sir?

Will Pwr · 09-26-2020, 12:06 AM

Quote:

Originally Posted by suby01

How wide are the wheels F and R sir?

Sorry about that, I should have mentioned that in the other reply

20x9.5 +20
20x10.5 +30

Will Pwr · 09-26-2020, 12:11 AM

Here are some 3/4 shots for visual points of reference of the sizes

Admiral · 09-26-2020, 04:20 AM

I'm on 245 45 20 and 275 40 20, RFT's works well, very pleased with grip etc.

suby01 · 09-26-2020, 08:11 AM

Quote:

Originally Posted by Admiral

I'm on 245 45 20 and 275 40 20, RFT's works well, very pleased with grip etc.

Thosw are complete OEM tire specs yes they definitely will work. But also depends on grip and style for anyone else going bigger.

ltym5 · 09-26-2020, 08:59 AM

Quote:

Originally Posted by Will Pwr

Im currently running 265/45R20 and 295/40R20 and there are no issues as well. Technically 255/45R20 fronts would have kept that 100% status quo, but I wanted a meatier tire up front.

Edit- quick pic attached

Nice pic! Just curious, have you done launch control with this setup and did you have any issues with tire spinning or wheel hop?

I need a wider tire and thinking about going with Toyo R888r for the rear. My front wheel is 20x9 and rear wheel is 20x10.

Will Pwr · 09-26-2020, 09:56 AM

Quote:

Originally Posted by ltym5

Quote:

Originally Posted by Will Pwr

Im currently running 265/45R20 and 295/40R20 and there are no issues as well. Technically 255/45R20 fronts would have kept that 100% status quo, but I wanted a meatier tire up front.

Edit- quick pic attached

Nice pic! Just curious, have you done launch control with this setup and did you have any issues with tire spinning or wheel hop?

I need a wider tire and thinking about going with Toyo R888r for the rear. My front wheel is 20x9 and rear wheel is 20x10.

I haven't done LC yet as I just recently got the RIS done. But in regards to off the line romps, I haven't had issues with wheel hop and traction feels good. Part of my change in the feel is due to the reduction in unsprung weight though (feels more responsive)

Did Toyo release some more 20" sizes for the R888r? Last I checked, all the sizes were too short. The widths are good but the aspect ratios where too thin.

RoWoX3M · 09-26-2020, 06:04 PM

Might be a silly question but visually think it will be noticeable that rears are a .5" shorter in height than stock rears?

suby01 · 09-27-2020, 05:00 PM

Quote:

Originally Posted by Will Pwr

Quote:

Originally Posted by suby01

How wide are the wheels F and R sir?

Sorry about that, I should have mentioned that in the other reply

20x9.5 +20
20x10.5 +30

Okay thats a badass size chart. Silly that BMW doesnt offer anything mildly as aggressive as this.

BMWX3JACK · 04-23-2023, 09:19 AM

Can X3 30I use tires with front wheels 255 45 20 and rear wheels 265 45 20?

09-25-2020, 02:08 PM	#1
RoWoX3M Lieutenant 401 Rep 568 Posts Drives: 2020 X3M Join Date: Aug 2013 Location: Maryland iTrader: (1)	Tire size question Has anyone done 255/45/20 and 275/40/20? I'm looking to go this route with aftermarket wheels. Instead of the rears being 1% taller than the fronts they would be 1% shorter. So 29/29.3 vs 29/28.7. I don't think there's any problem but wanted to check with the wise and all knowing. Thanks.
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09-25-2020, 05:39 PM	#2
suby01 Cowboy Astronaut Millionaire 2314 Rep 2,885 Posts Drives: 2020 X3 M40i Join Date: Aug 2019 Location: CT, USA iTrader: (0)	With those sizes youre exactly at 1% difference so you are OK to go with that setup. As long as you are 1% + or - with the F and R sizing specs you are fine to use it with the BMW X drive. Link for reference I was just shown earlier this week for anyone interested for other sizes. https://tiresize.com/comparison/ __________________ The Youtubes https://youtu.be/gzinBJjxIUY Insta https://www.instagram.com/gatosandturbos/
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09-26-2020, 12:11 AM	#10
Will Pwr eM Power Me 749 Rep 698 Posts Drives: '23 AW i4 eDrive40 M Sport Join Date: Apr 2006 Location: So Cali iTrader: (2) Garage List 2023 BMW G26 i4 eDr ... [10.00] 2023 BMW G20 LCI 33 ... [0.00]	Here are some 3/4 shots for visual points of reference of the sizes Attached Images __________________ Will - '23 Alpine White G26 ///i4 eDrive40 M Sport '23 Brooklyn Grey G20 ///330e M Sport '20 Alpine White F97 ///X3MC '20 Alpine White F39 ///X2 M Sport X
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09-26-2020, 04:20 AM	#11
Admiral Lieutenant 776 Rep 593 Posts Drives: 2019 BMW X3 2.0D X Line G01 Join Date: Nov 2019 Location: Cymru UK iTrader: (0)	I'm on 245 45 20 and 275 40 20, RFT's works well, very pleased with grip etc.
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09-26-2020, 06:04 PM	#15
RoWoX3M Lieutenant 401 Rep 568 Posts Drives: 2020 X3M Join Date: Aug 2013 Location: Maryland iTrader: (1)	Might be a silly question but visually think it will be noticeable that rears are a .5" shorter in height than stock rears?
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04-23-2023, 09:19 AM	#17
BMWX3JACK Registered 0 Rep 1 Posts Drives: BMWX3 Join Date: Apr 2023 Location: CHINA iTrader: (0)	Can X3 30I use tires with front wheels 255 45 20 and rear wheels 265 45 20? Can X3 30I use tires with front wheels 255 45 20 and rear wheels 265 45 20?
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