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Old 06-27-2019, 09:12 AM
dwmmlm dwmmlm is offline
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Upsizing F06 R19's from 245/40 to 245/45

I would imagine this has been discussed before, but I can't find any specific to the 640i GC. I am dumping the RFT's and want to go from 245/40 to 245/45 (about 1 inch larger sidewall) on my 19 inch rims. I found one guy who said he thought there may be an issue with the front suspension rubbing, but no other advice or opinions. Has anyone moved up to this tire size?
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Old 06-27-2019, 09:20 AM
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QSilver7 QSilver7 is offline
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I have seen this question asked many times...and I believe it is doable.

But you can also double check yourself by running it through a wheel/tire calculator. Click the following link to one of my fav wheel/tire calculators...and input the data for your existing wheel/tire...then compare it to your new setup (wheel/tire). If you have a staggered set-up (front & rear wheels & tires are different sizes)...then compare the old/new front setup...then the old/new rear setup. The site will compare and show you the specs for each one and reveal if there will be additional "poke" (outward toward the fender) and "inset" (inward toward the suspension)...as well as any increase/decrease in height and width: www.willtheyfit.com
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https://www.bimmerforums.com/forum/attachment.php?attachmentid=637911&d=1538398374&thumb=1&stc=1
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Old 06-27-2019, 09:38 AM
dwmmlm dwmmlm is offline
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This is a great site. I think it will work too, just thought I'd see if there was any experiences out there with that specific combination just to give me the warm and fussy before heading to the shop.
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Old 06-27-2019, 10:17 AM
dwmmlm dwmmlm is offline
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I spoke with Tire Rack and they were non-committal on the fit.
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Old 07-01-2019, 08:53 PM
thebmw thebmw is offline
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I've done it. It works and IMO, looks a little better as the wheel gap is smaller and provides a much more comfortable ride.
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Old 07-02-2019, 07:34 AM
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QSilver7 QSilver7 is offline
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Thanks for the update.

Glad it worked out for you....but you gotta know that a few pics (showing the look) would have been like a cherry on top of the sundae.
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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 2013 F06 650ix Gran Coupe` (Black Sapphire) 1/13 mfg date
(SOLD)
97 740iL (Arctic Silver) <<~>> 99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

https://www.bimmerforums.com/forum/attachment.php?attachmentid=637911&d=1538398374&thumb=1&stc=1

Last edited by QSilver7; 07-02-2019 at 07:36 AM.
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Old 07-03-2019, 01:37 PM
dwmmlm dwmmlm is offline
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Thanks. Do you think there's an issue with the transmission changing wheel diameter? I have AWD - Not sure if that matters.
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Old 07-03-2019, 03:36 PM
thebmw thebmw is offline
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Quote:
Originally Posted by QSilver7 View Post
Thanks for the update.

Glad it worked out for you....but you gotta know that a few pics (showing the look) would have been like a cherry on top of the sundae.
Will try to get one
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Old 07-03-2019, 03:36 PM
thebmw thebmw is offline
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Quote:
Originally Posted by dwmmlm View Post
Thanks. Do you think there's an issue with the transmission changing wheel diameter? I have AWD - Not sure if that matters.
No. I don't think so as they are all the same ratios.
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Old 07-05-2019, 06:50 AM
dwmmlm dwmmlm is offline
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Originally Posted by thebmw View Post
No. I don't think so as they are all the same ratios.
I would expect the ride to be a bit better too. Especially if you're (which I am) dropping the RFTs.
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Old 07-05-2019, 08:45 AM
luigi524td luigi524td is offline
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Since you're (also) changing from RunFlat to GoFlat are you also carrying the spare tire for break-down situations? IF you are, the rolling radius of the slightly larger size you're intending to fit may make the use of that "spare" less than ideal -- maybe even be incompatible with BMW's AWD system.
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Old 07-05-2019, 12:25 PM
dwmmlm dwmmlm is offline
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Quote:
Originally Posted by luigi524td View Post
Since you're (also) changing from RunFlat to GoFlat are you also carrying the spare tire for break-down situations? IF you are, the rolling radius of the slightly larger size you're intending to fit may make the use of that "spare" less than ideal -- maybe even be incompatible with BMW's AWD system.
That's a good point. I was planning on carrying a flat kit to limp to the nearest aid station in the event of a flat.
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