Interesting, but according to the OP by twotractors each CB1300 mirror sticks 57 mm (2¼") more than the standard CBF1000 mirror. My question is how do you get on filtering with that extra 114 mm (4½")? My filtering riding into and around London (M11, A12, A406 etc) is bad enough with the narrow stock mirrors, especially filtering around the A406 in peak hours. I'm thinking the extra width would impede progress.