Check out the Darkside forum in the sub-boards. My experience with the BT 45 was it was a great road tire, but that is about it. It is a dual compound tire that has very soft sides. Mine cupped really bad right away and by 17k it was so loud in turns I tossed it, with 4/32 left on the thread. Others have had good luck with them. I have had better luck with the Metz lazertec bias rear tire on the front. They cup also but not as bad as the BT 45.