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225/50 18" Tire Size

 
Old 03-11-2019, 10:05 AM
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Question 225/50 18" Tire Size

Good morning all! Lost my second front 18" wheel to our local potholes (stock tire size 235/40 18")
I was contemplating going to 225/50 18" which is the stock size on the current TLX. I know this will be
about 1" larger in diameter and will affect the speedo, but give lots more sidewall for wheel protection.
Has anybody gone with this combo without big issues? I'm currently on new stock suspension 2006 TL.
Only other choice would be to go back to 17" but I much prefer my current wheelset.
Thanks for any input you may have!

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Old 03-11-2019, 10:22 AM
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Originally Posted by jazz6554 View Post
Good morning all! Lost my second front 18" wheel to our local potholes (stock tire size 235/45 18")
I was contemplating going to 225/50 18" which is the stock size on the current TLX. I know this will be
about 1" larger in diameter and will affect the speedo, but give lots more sidewall for wheel protection.
Has anybody gone with this combo without big issues? I'm currently on new stock suspension 2006 TL.
Only other choice would be to go back to 17" but I much prefer my current wheelset.
Thanks for any input you may have!
A couple of comments:
  • The correct size for your car with 18" wheels is 235/40 R18 (diameter of 25.40").
  • Your 235/45 R18 (diameter of 26.33"); nearly an inch larger in diameter than stock.
  • If you opt for 225/50 R18 tires (diameter of 26.86") you'll be even further beyond OEM spec.
I'd avoid the 225s for a couple of reasons, they are an inch or so narrower than the OEM spec tire and will not provide as much traction (linear or lateral), and they are nearly an inch and a half larger in diameter than OEM spec which will make for significant speedometer and odometer error.
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Old 03-11-2019, 10:33 AM
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Thanks horseshoez I had a typo when I posted which I corrected - have been using 235/40 R18. It is stock size for the 18" wheel.
Looks like the only option will be back to 17" I guess........so tired of these crap roads........
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Old 03-11-2019, 10:54 AM
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Originally Posted by jazz6554 View Post
Thanks horseshoez I had a typo when I posted which I corrected - have been using 235/40 R18. It is stock size for the 18" wheel.
Looks like the only option will be back to 17" I guess........so tired of these crap roads........
Agreed. Unfortunately, even dropping back to 17s for the winter is no guarantee of immunity to pothole damage; I just had the opportunity of buying two new tires for my TL running stock 17s due to a pot hole. One other option, if you have a non-Type-S model with an automatic transmission is to drop down to 16" wheels and run 215/55 R16 tires.
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Old 03-11-2019, 01:42 PM
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Yes mine's a base with AT. Continental DWS06 tires......weird thing is the tires are fine even after the wheels were substantially bent.
I'm still mulling the 235/45/18 as it would be the same sidewall as stock 17s. I'll talk to the service manager tomorrow and see if I can
get away with it. None of this would of course be necessary if our insane tax dollars actually paid for infrastructure........
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Old 03-11-2019, 03:57 PM
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Originally Posted by jazz6554 View Post
Yes mine's a base with AT. Continental DWS06 tires......weird thing is the tires are fine even after the wheels were substantially bent.
I'm still mulling the 235/45/18 as it would be the same sidewall as stock 17s. I'll talk to the service manager tomorrow and see if I can
get away with it. None of this would of course be necessary if our insane tax dollars actually paid for infrastructure........
But that will impact both your speedometer and odometer.
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