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235/45/18 vs. 245/40/18

 
Old 12-03-2018, 11:44 AM
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235/45/18 vs. 245/40/18

Well, time has come to replace the current, incorrect size, tires on my BBS CHs. I am leaning towards Michelin Pilot Sport A/S 3+ in the 245/40/18 configuration but I would love to hear what others may suggest. I attached several photos of the current tires which are 225/40/18 for reference. Wheels are 18x8 ET 38 all around. I will consider rear spacers after tires are installed.









Last edited by Sheefo2k; 12-03-2018 at 11:49 AM.
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Old 12-03-2018, 12:04 PM
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I'm on 18's as well but with a 30 offset. I prefer 245 40's.
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Old 12-03-2018, 03:57 PM
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Could you post a picture of your setup for comparison?
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Old 12-04-2018, 03:16 AM
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Sup man, I would go with 245 instead of 225 to almost match factory Circumference and it will look good with your wheels, I have 245 on my 18x8.5 and handles pretty good

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Old 12-04-2018, 09:17 AM
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Originally Posted by jobata23 View Post
Sup man, I would go with 245 instead of 225 to almost match factory Circumference and it will look good with your wheels, I have 245 on my 18x8.5 and handles pretty good
The original 225 were from the previous owner who stretched them for his car (non TSX). I think I am going to order the 245/40/18. For some reason, I like the peace of mind knowing I have 45 series tires but I know 45 series on 245 will be too much.
It's like you give up sidewall for width or vice versa.
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Old 12-04-2018, 09:36 AM
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18 by 8 with a 30 offset and Tein S-Techs with 245 40 18's
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Old 12-06-2018, 06:29 AM
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245/40 might look a little pinched off on a 18x8. But that's the correct diameter for the car. I am using them on 18x8.5 +35.
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Old 01-04-2019, 09:14 AM
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Originally Posted by BROlando View Post
245/40 might look a little pinched off on a 18x8. But that's the correct diameter for the car. I am using them on 18x8.5 +35.
Of course the guy at discount tire suggests 245/45/18 which I think will be too large and my speedo will be of.
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Old 01-04-2019, 09:30 AM
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Originally Posted by Sheefo2k View Post
Of course the guy at discount tire suggests 245/45/18 which I think will be too large and my speedo will be of.
Per TireRack, the correct size for your car is 225/45 R18, if you want to move up to a 245mm section width on 18" wheels then your best option would be 245/40 R18 (which will induce a small speedo error where the speedometer and odometer indicate 0.5%-1.0% greater than actual); if you instead opt for the 245/45 R18 tires, you will induce a speedometer and odometer error of more than 2.0% below actual. Regarding your comment about 45 series tires, unless you stay with the same section width, your argument is invalid. Why? The series numbers are expressed as a percentage of the section width; said another way, the 225/45 R18 tires have on the car now, have the same size sidewall height as a 245/40 R18 tire.
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Old 04-29-2019, 09:34 AM
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I like to update my threads in case someone else is in my shoes and is looking for answers. I ended up going with 235/45/18, simply because the 245 would have been slightly pinched on a 8" and bubblier sidewall like Brolando mentioned. I am extremely happy with my decision.



235/45/18 18x8 ET 38 BBS CHs 012
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