OK so I'm a newbie and no expert but for what its worth I had an 05 660R and always used OE Michelin Siracs. I never had any problems with them so never tried anything else. I now have a 09 660R which runs metzler tourance. I find the Tourance way better for road use good in wet and dry. Can't comment on off road ability cos I ve no experience. Anyway I'm sure others will have their own views so wait and see what else people say but this is my experience.