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      05-04-2015, 12:02 AM   #1
iparout
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Cracked 19 inch 313 BMW Performance rear rim for the 2nd time. New tire options ?

Hi.

Happy owner of an sDrive 2.3i for 5.5 years now, however my rear 313 BMW Performance rim cracked for the 2nd time and destroyed the Bridgestone RE050 RFT that came with the car.

Having already put 45000 km on the stock tires, I believe it's time to replace them with new ones.

Having read around, I figured that the non-RFT is the way to go in order to protect those rims. It was also recommended to me to go from 225/35/19 front and 255/30/19 rear to 235/25/19 and 265/30/19 respectively (roads are shit here in Greece). Question is, how much pressure should I be using with the new tires ?

Also, I will choose one of the top 5 options here. I know most people vouch for the Michelin PSS, but will it be such a big compromise to go for one of the other 4 options, if the price is much better ?

Last but not least, will the tyre pressure monitor indicator still work with the non RFTs if they start to lose pressure ?

Thanks a lot for any help.
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      05-04-2015, 02:46 PM   #2
nicknaz
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what were your tire pressures?

Yes, TMPS will still work with non RFT and PSS is a top choice on these forums
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      05-04-2015, 02:49 PM   #3
iparout
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Tire pressures as indicated by the manufacturer for 19 inch wheels (silver label on the drivers door) are 2.3 front and 2.8 rear.

That's what I've been using since day one.
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      05-05-2015, 12:55 AM   #4
HerrK
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Quote:
Originally Posted by iparout View Post
It was also recommended to me to go from 225/35/19 front and 255/30/19 rear to 235/25/19 and 265/30/19 respectively (roads are shit here in Greece). Question is, how much pressure should I be using with the new tires?
I assume that you meant your Frt tire aspect ratio of 25 to be 35. Going up 10 mm in width will only gain you a very small height increase (3 mm). That will not substancially change the rim protection. If you want to increase your chances of rim survival on crappy roads.

1. Go with any non RFT.
2. Increase your "Aspect Ratio" from 30 to 35 in rear and 35 to 40 in frt.
I run 235/40-19 in Frt & 265/35-19 in rear. However I will drop the Frt size down to 225/40-19 in Frt.

This fills the wheel well gap so it doesnt look like your driving an SUV. I only had one very minor fender liner scuffing when at full lock with new 235/40 frt. Now that they are half worn no more scuffing at full lock. Rears have never scuffed or rubbed. There are photos posted, but I'm not in the mood to look for them now.

Regarding tire pressure there are a lot of good posts and info on the interweb (search "Chaulk Test") on how to determine your correct tire pressure with different sizes. It involes a good tire pressure gauge, a portable air compressor, chaulk, an empty parking lot, and some patience. A infared temp probe is also helpful. I set my noted sized PSS at 38 rear and 34 frt based on the chaulk test & temp method.
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      05-08-2015, 12:14 PM   #5
Squddie
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This is why I am dumping the RTFs before they crack the VERY EXPENSIVE oem wheels on my lease.

As I said in the other thread, I am probably going with the Hankook Ventus V12 this time around. I can't see myself spending PSS money after having been disappointed by Michelin with past A/S tires.
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