I've got up to 8500km now and have 5mm tread remaining which means 4mm wear. at this rate they will be 16,000km (10,000mi) rear changeouts.
The front, should it ever decide to start showing any wear, may wear out one day. Still looks like new. Still grips like sh!t on a shovel.
I have been running the front at 2.5 bar when loaded on a recent big trip (3,500km) and rear at 2.9 Bar (both max BMW recommendations) and found some shimmy on the front when riding around unladen. so I dropped them both to the recommended 2.2 and 2.5 and it does not shimmy at all, and I feel the front working well again. Rear feels a little soft on the asphalt so I've gone back to 2.3 and 2.7, perfect unladen. I'll probably go down to 2.2 and 2.5 for dirt.
Still very happy, will buy another set unless I start doing more dirt than asphalt or have a big dirt trip planned.
more Trail attack stuff HERE.