Okay but what brand do you recommend because if I'm wrong you mentioned two brands. And can they come in the stock size (240/40R18)?Actually, the M109R is the first bike I've owned where I've had to replace both at the same time. I was getting such good wear out of the Dunlop rear tires, that they lasted almost as longas the fronts. Close enough to justify replacing both. Typically, I've always had to replace the rear tire twice to the fronts' once. My B-King has been that way. And also, the Metzeler tires on my M109R now are the same. Rear tire (280 on 10 inch rim) is close to needing replaced, front still has plenty of tread left.
The stock tires the M109R comes with suck. My stock front tire has some strange off center tread wear going on that has not been replicated by any of the after market tires. So, if you're still on stock tires, look the front over and see if it looks good, or not. But I'd just ditch both stock tires ASAP. That being said, I did get near 11,000 miles out of my stock tires. If you're anal about keeping the pressure at 42 psi, they will go a long way.
Until 2018, when I put on all new Coastal Moto rims so I could run a 280 on the back, I ran three sets of Dunlop Elite III tires, front and rear. They did well for me. But I do believe they are now called Elite IV. I can't speak toe the IV version.