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-   -   Upsizing F06 R19's from 245/40 to 245/45 (https://www.bimmerfest.com/forums/showthread.php?t=1336277)

dwmmlm 06-27-2019 10:12 AM

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?

QSilver7 06-27-2019 10:20 AM

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

dwmmlm 06-27-2019 10:38 AM

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.

dwmmlm 06-27-2019 11:17 AM

I spoke with Tire Rack and they were non-committal on the fit.

thebmw 07-01-2019 09:53 PM

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.

QSilver7 07-02-2019 08:34 AM

Thanks for the update. :thumbup:

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. :D

dwmmlm 07-03-2019 02:37 PM

Thanks. Do you think there's an issue with the transmission changing wheel diameter? I have AWD - Not sure if that matters.

thebmw 07-03-2019 04:36 PM

Quote:

Originally Posted by QSilver7 (Post 13043073)
Thanks for the update. :thumbup:

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. :D

Will try to get one:thumbup:

thebmw 07-03-2019 04:36 PM

Quote:

Originally Posted by dwmmlm (Post 13044365)
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.

dwmmlm 07-05-2019 07:50 AM

Quote:

Originally Posted by thebmw (Post 13044441)
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.

luigi524td 07-05-2019 09:45 AM

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.

dwmmlm 07-05-2019 01:25 PM

Quote:

Originally Posted by luigi524td (Post 13045659)
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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