So I came out to get in my CMS and I walked up behind it and notice that there was a light stripe on the right rear. I looked closer to see what it was and realized that the center of the tire was bald and that the belting was showing through. I checked the rest. They all show wear but nothing like the right rear/ former right front. 19.5k miles. One rotation front to back. Do I have a bad tire, bad alignment or am I not consistent enough on the tire pressure?

 

Wow. I'm at 17,000 miles and my Pirelli runflats (oem summer 18's) came off when my snows went on at 12,300. I noted then that my two fronts were wearing twice as fast as the rears (mine hadn't been rotated) and probably only had about 2k left in them. I'm not putting them back on come spring (going with Michelin super sports most likely). Which tires were these?

 

Assuming a properly manufactured tire, excessive wear around the center of the tread is usually an indication of over-inflation over a period of time. If you've been keeping all tires at correct tire pressures, that raises the question of why the right rear has corded while the other side hasn't (maybe the left rear is close to cording).

A poor alignment (improper camber or toe settings) usually produces excessive wear at the edges of the tire tread rather than around the center.

 

I've found 5K to be a good rotation mileage, when I let it go to 12K on one set of tires I had huge wear and lots of noise, now I do them every 5K, FWIW. Also, check those inflation pressures - while the onboard system will report a low tire, I doubt it will report one that's overfilled. 20K is about all I get on a set of tires on my Clubby.....

 

The left is pretty close to showing too. I think it's time to replace them all, I just don't want to spend the money right now. I thought I'd get to 25k before i needed new. DO non-RF's last longer?

 

Non-RFTs are certainly lighter and cheaper than RFTs. Most will provide a more compliant (less harsh) ride as well. Whether you'd get more miles out of them would depend partly on what kind of tires you choose (their wear index, or UTOQ), and how you treat them (maintaining air pressure, rotating, and driving). In general, All Season and Grand Touring tires provide longer wear than high performance summer tires, whether RF or non-RF.

For example, the Countryman S RF tires (205/55/17) that came from the factory include the High Performance Summer Pirelli P7 with a UTOQ of only 260, and the Pirelli P7 All Season with a UTOQ of 500. You should get significantly more miles out of the latter than the former, although you'd be giving up some handling grip in dry conditions.

What tires came on your CMS?