HELP - 228i Gran Coupe Xi Tire Side Adjusment Inquiry

mdjhnsn06 · 10-28-2023, 10:43 PM

Hello Everyone!

I'm new to the forum and look forward to a lot of the threads that I will get to see. I need some assistance on tires.

My 2021 BMW 228i Gran Coupe XI came with 225/40R-18 wheels on it. Living in rural Northwest Tennessee, we are in pothole/crater country. I cringe every time I go down the road out of fear, I will have to dodge them. My question is will a 255/40R-18 fit without any modification? Just to have a slightly taller tire? Or what does the group recommend? I would truly appreciate it.

Thanks!

MJ

John in VA · 10-29-2023, 09:49 AM

Your car came with 225/40R-18 tires on it, not wheels. If you're worried about potholes damaging your wheels or tire sidewalls you need a taller tire, not a wider one. 255/40R-18 is 30 mm wider, but has the same sidewall aspect ratio as your stock tires. You could consider something like 205/45-18 for more protection.

The size of your wheels also needs to be taken into consideration - obviously you'd need an 18" tire diameter, but the wheel width also dictates what width of tire can be safely mounted. And you need to determine if the taller tire will clear the wheel well & body work.

https://tire-calc.com/comparison/225...nd-205-45-r18/

Look through/search previous threads on the wheel/tire section of the forum, or ask there. Good luck! https://www.2addicts.com/forums/forumdisplay.php?f=521

mdjhnsn06 · 10-30-2023, 12:22 AM

Hello John,

Thank you so much for your response. I also should have stated "tires" and not "wheels"....lol. I will check out those other threads you recommended as well as check into the 205/45/18 you mentioned.

MJ

Shovelman · 10-31-2023, 06:12 AM

18" wheels are what all the cool kids get, and they cost more so they must be better, right?

17" wheels and tires ride better and are more durable. And I think they are lighter so better handling on bumps.

leftoverture · 11-01-2023, 01:14 PM

Quote:

Originally Posted by Shovelman

18" wheels are what all the cool kids get, and they cost more so they must be better, right?

17" wheels and tires ride better and are more durable. And I think they are lighter so better handling on bumps.

Your best option is to drop down a size and move to the 17" wheels.

iberro2 · 11-03-2023, 10:50 AM

I had the same problem with my 228 xdrive coupe came with cool looking 225/40/18. Living in Michigan also potholes are everywhere literally. I changed to 205/50/17 they fit perfectly without any modifications I did it by comparing the tire height on tire calculator or comparison. But yeah 205/50/17 is ur choice

morphomeman · 11-03-2023, 11:10 AM

Similar story. I bought 17" wheels for winter tires. After the warranty expired on my original tires and wheels (I paid extra for it when purchasing the car new) and I got tired of flats, I simply put summer tires on the 17" wheels and sold the original OEM 18"wheels on Craigslist for a few hundred bucks. Knock wood, no flats since.

10-28-2023, 10:43 PM	#1
mdjhnsn06 Registered 2 Rep 2 Posts Drives: BMW 228i Gran Coupe XI Join Date: Oct 2023 Location: South Fulton, TN iTrader: (0)	HELP - 228i Gran Coupe Xi Tire Side Adjusment Inquiry Hello Everyone! I'm new to the forum and look forward to a lot of the threads that I will get to see. I need some assistance on tires. My 2021 BMW 228i Gran Coupe XI came with 225/40R-18 wheels on it. Living in rural Northwest Tennessee, we are in pothole/crater country. I cringe every time I go down the road out of fear, I will have to dodge them. My question is will a 255/40R-18 fit without any modification? Just to have a slightly taller tire? Or what does the group recommend? I would truly appreciate it. Thanks! MJ
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10-29-2023, 09:49 AM	#2
John in VA Colonel 989 Rep 2,200 Posts Drives: 2015 228i M Sport Join Date: Jul 2007 Location: Leesburg, VA iTrader: (6)	Your car came with 225/40R-18 tires on it, not wheels. If you're worried about potholes damaging your wheels or tire sidewalls you need a taller tire, not a wider one. 255/40R-18 is 30 mm wider, but has the same sidewall aspect ratio as your stock tires. You could consider something like 205/45-18 for more protection. The size of your wheels also needs to be taken into consideration - obviously you'd need an 18" tire diameter, but the wheel width also dictates what width of tire can be safely mounted. And you need to determine if the taller tire will clear the wheel well & body work. https://tire-calc.com/comparison/225...nd-205-45-r18/ Look through/search previous threads on the wheel/tire section of the forum, or ask there. Good luck! https://www.2addicts.com/forums/forumdisplay.php?f=521 __________________ ____________________________________________ 2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining Last edited by John in VA; 10-30-2023 at 07:38 AM..
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10-30-2023, 12:22 AM	#3
mdjhnsn06 Registered 2 Rep 2 Posts Drives: BMW 228i Gran Coupe XI Join Date: Oct 2023 Location: South Fulton, TN iTrader: (0)	HELP - 228i Gran Coupe Xi Tire Side Adjusment Inquiry Hello John, Thank you so much for your response. I also should have stated "tires" and not "wheels"....lol. I will check out those other threads you recommended as well as check into the 205/45/18 you mentioned. MJ
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10-31-2023, 06:12 AM	#4
Shovelman Lieutenant 244 Rep 527 Posts Drives: 2017 230i Join Date: Jan 2017 Location: Michigan iTrader: (0)	18" wheels are what all the cool kids get, and they cost more so they must be better, right? 17" wheels and tires ride better and are more durable. And I think they are lighter so better handling on bumps.
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11-03-2023, 10:50 AM	#6
iberro2 New Member 2 Rep 11 Posts Drives: 2016 Bmw 228i xDrive Join Date: Jan 2023 Location: Michigan iTrader: (0) Garage List 2016 Bmw 228i xDrive [0.00]	I had the same problem with my 228 xdrive coupe came with cool looking 225/40/18. Living in Michigan also potholes are everywhere literally. I changed to 205/50/17 they fit perfectly without any modifications I did it by comparing the tire height on tire calculator or comparison. But yeah 205/50/17 is ur choice
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11-03-2023, 11:10 AM	#7
morphomeman Major 593 Rep 1,219 Posts Drives: 2015 M235ix Join Date: May 2015 Location: United States iTrader: (1) Garage List 2016 BMW X3 [0.00] 2015 BMW M235ix [0.00]	Similar story. I bought 17" wheels for winter tires. After the warranty expired on my original tires and wheels (I paid extra for it when purchasing the car new) and I got tired of flats, I simply put summer tires on the 17" wheels and sold the original OEM 18"wheels on Craigslist for a few hundred bucks. Knock wood, no flats since.
	Appreciate 0 Quote