I use Metzeler or Pirelli touring tires on all my bikes. I'e gotten great mileage in the past (8 to 10k on a set) and they have great straight line & cornering grip.
The set I just put on the GZ was a Pirelli Route on the rear ($107.65) and the Pirelli Sport Demon ($90.57) on the front. (the Route model was not available in the correct front size) The tubes were $8 each.
I have a couple of pals with the Cheng Shins that have had sidewall problems, so I stick two the above mentioned brands.
