loops - face exruding

so i have my quasi bmw logo, want to extrude the outer ring - it is on the picture, ctrlR is nice but it do not work with circles. ctrlR alt shitf wtf? any idea?

Looks like you have some double vertices or internal faces in your mesh. get rid of them before doing any extruding.

Also be clearer exactly what you want. Ctrl+R is nothing to do with extruding. Alt+RMB is loop select


found the solution. just it is hard to mark the edges. thx