[Wires]

My RFT's are fine until they start to wear after a couple years. The cabin noise right now (4 years on the tires) is starting to get quite high. When they were new, it was very manageable.

[Wires]

Originally Posted by OC_F32

Had the car looked at. The issue turned out to be the rear driver side wheel bearing. It's been replaced and the dB registers at around 66 in the cabin now. Thought I'd give an update for those interested.

I had the same bearing needing swap in the first year of owning the car as well. They called it "rail bearing" being caused when the vehicle is shipped by train, and a needle in the bearing sits against the bearing race with no grease. You get a "arc" from the induced static, destroying the needle.

[JimKden]

Bearings damaged during railroad shipment were first discovered during world war II. Heavy materials like tanks had the problem and it was determined that the jarring without bearing rotation squeezed the grease from the contact line between the roller and the race. The failure mode was fretting erosion on that spot on the race and roller.

[Ryno]

Thanks for info everyone. I've had my F30 for a few months now and have always thought the road nose was excessive. Almost as loud as my wife's E46 convertible..... well kinda. I'm putting some 403s on with Pilot Sports and guess I'll get the bearings looked at at the same time now.

Originally Posted by JimKden

Bearings damaged during railroad shipment were first discovered during world war II. Heavy materials like tanks had the problem and it was determined that the jarring without bearing rotation squeezed the grease from the contact line between the roller and the race. The failure mode was fretting erosion on that spot on the race and roller.

That's pretty interesting. Cool little tid bit of knowledge!

[jcordier]

Originally Posted by OC_F32

Hey guys,

So I've been experiencing what I would describe as excessive road noise from my car. The sound reminds me of my 2009 VW Jetta, tires out of balance and super worn. I've noticed it for a while now and feel like it started happening (or I started hearing it) a thousand miles before I changed my tires out. At that time, I assumed it was the tires but when I replaced them the problem persisted. The annoying droning sound starts around 25 mph and progressively gets louder until cruising speed of about 80mph. No change when coasting w/ transmission on neutral or turning left or right.

2015 F32
19" Staggered OEM 403s
Bridgestone S001 run flats
Front 32 PSI, Rear 35 PSI

Any experience with this or insight would be appreciated.

Change the run flats and it'll help a bit. Run flats tend run loud. No pun intended lol

[TodmordenLad]

Run flats and inadequate sound insulation, I'm afraid.
Some RFTs are better than others. Goodyear Eagle F1 Asymmetric tyres are regarded by many as the quietest.
Not much you can do about the sound deadening unless you're prepared to spend a lot of cash/put in a lot of effort.

[Techno 9000]

Originally Posted by OC_F32
"The issue turned out to be the rear driver side wheel bearing. It's been replaced and the dB registers at around 66 in the cabin now.
Thought I'd give an update for those interested."

Ahem,
The OP sorted his problem.

[340i_f30]

Sounds like wheels may not be balanced or are slightly bent, or could be wheel bearings.

[Techno 9000]

My money is on wheel bearings....

[BMWM5NYC]

Originally Posted by Techno 9000

My money is on wheel bearings....