The BT54R front didn't last long

[pekingduck]

Very good explanation Pekingduck, especially with the drawing, i would like to add that i wore both rear tires on the cb1100 out on the right hand side ( left hand traffic here in nz.) it had me baffled for quite a while and only on the cb1100.
One day i noticed that i was using the rear brake unintentionally and mostly without noticing it, turned out that the rear brake on the cb1100 is quite "grabby", it works well and i had my foot positioned in such a way that it activated the rear brake when i felt a bit quick and slow down almost automatically a bit in a right hand turn ( outside and faster in nz ).

So i have un-learned that habit and we'll see if that makes a difference, i have replaced the first rear tire on the cb1000r and did not have the same uneven wear, so i'm still learning stuff.

Thanks Max. I see it mostly on the front, the rear wearing out in the center before one side on mine.
My rear brake has very little freeplay, and I have to lift my foot to be above the pedal, so don't use it enough. I need to adjust it downward, but have just been too busy (lazy).