I own both the 2018 MT-09 and 2018 MT-07 because I couldn't decide which one I wanted. I know...I'm spoiled. Anyhow, I noticed that every time I take the 09 out for a spin and get aggressive with the throttle to experience the acceleration and torque I come home and my lower back is strained and will be for a few days. If I take the 07 out and do the same kind of ride and I am fine. What the heck is going on? I'm a very athletic 60 years old guy who does 50 to 100 miles bicycle rides a road bike and I mountain bike frequently. I'm just shy of 6' and weigh 160 lbs. I have a 36" inseam and short torso but long arms. Anyhow, I took my 09 for a quick spin around the block today and bingo...I can feel my lower back start to stress from what I believe is the massive amount of torque this bike has. It happens every time I ride the 09. I really like this bike but if I can't figure it out she will have to sadly go up for sale and I'll keep the 07 instead. If someone can offer some idea about what is going on I would really appreciate it. Thanks!