I think im gonna have to get rid of this 6.6 acerbis tank i bought. I rode 75 miles today, and it seemed to beat the stuffing out of my knees... It has some knee recess things, but when i stick my knees in them, i am sitting much further back in the seat that i usually do...so when i sit forward up on the tank, my kness bang into the corners. Im 6 foot tall...maybe someone with shorter legs would be better off? Aside from that, i was really impressed with the tank. the fit/finish, etc...The way it handled...it seems that it carried the weight pretty low...I did not notice a significant difference in feel when i rode today.