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I purchased the bike with Avons front and rear. Had the rear tyre cut through by I dont know what. But it left me with the steel cords cut and protruding. I purchased a Metlzler as a replacement, I like the feel of the Metzler perhaps better than the Avon. The jury is still out on lifespan.
I've had two sets of Metzeler Z6s hoping they were better than the old Bridgestone 21s but no difference in overall average km at about 10,000 for the rear (12000 for front) for mainly two up riding and 50 percent trailer usage. Even the BT 23's failed in their claimed 30 percent better mileage over the 21s.
I fitted Z6's to my CBR1000F. Mostly towing my Classic Ultralite trailer with camping gear and two up riding, a rear Z6 lasted about 8,000km, including the BDR to Alice Springs in 2011. I replaced them with Z8's for the BDR to Alice Springs in 2012, but the rear didn't seem to last any longer and the front went out of shape.

I am now running the BT023's on the CBR and it has about 5,000kms without much sign of wear.

The heavy duty, single compound Exedra radials on the ST13 grip well enough and two up, towing the trailer, the rear will easily make 10,000km, as we rode from Perth to Townsville on the return leg of the BDRAA this year, on the one rear tyre. The front had done 15,000km without any major signs of wear, so may well have made the fabled 30,000km.
