when do you usually replace your oem stock tires?
 

so the tires on my 09 30i are at 63,000kms. i wonder if they are junk. lol

I am in the same boat right now. Trying to decide whether to go with Bridgestone RunFlats again, or non-RFts. I have been reading as many threads as possible regarding members impressions about which tires are best for the E70, but the variety of opinions about certain brands, winter vs all-season, etc. makes it tough to choose. I will likely go with a dedicated winter tire (Pirelli Ice & Snow) non-rft this winter, and the Michelin Latitude Touring ZP Run Flats when spring rolls around. I only have about 24,000 mile on my oem Bridgestones, but slipping on ice last Spring scared me into going with dedicated new tires as soon as the temperatures drop.

"when do you usually replace your oem stock tires?
so the tires on my 09 30i are at 63,000kms. i wonder if they are junk. lol"

I replace my tires when they get worn to near the 'wear bars'.
I replace my m'cycle tires sooner.

I would suspect many of the readers/posters get varied mileage, but yours at ~36k miles may, or may not be ready for replacement.

hmmm. what do wear bars look like? LOL

I replace tires when they wear out. generally.

If you don't know what wear bars are...and you cannot figure out the whole "google" thing, take the car to a BMW dealer and ask them.

I was back visiting my parents in DC a couple weeks ago and rode in the X5 with the stock Bridgestone Dueler RFTs. Man, those things are now LOUD at 24.500km! I thought it was a pavement issue but even on fresh pavement at 80-100km/h (thank you VDOT) the white noise from the tires is awful. Totally ruins whatever I'm playing on the CD audio. Probably about 60-70% life, judging by a quick glance at them.

If I had to live with that truck......oh wait no I don't.

A wear bar is the thin, black rubber ridge on your tires between the tread blocks. When the tread wears down to these ridges, it's definitely time to replace.
http://www.justtires.com/assets/cms/...-TreadWear.jpg

I can't speak for the Bridgestone's but my Dunlop 20" RTFs are pretty quiet and I have about 50-60% left on them.

Look for the wear indicators on the tire. That will give you an idea. For me personally, if I am down to the wear indicators in the middle of summer (does not rain here in summer) I don't sweat it and may use the tires a bit longer. But in the winter rainy months I am more conservative and may even replace the tires a little bit before I hit the wear indicators as to avoid any hydroplaning. In the winter it's just not worth risking an accident and running on the tires when they are worn.