I now have an Optima Hopper II. Where will I find the Frame Number? Should I take the seat off to look for it? It doesn't appear to be on the under side.

I have adjusted the BB Avid brakes to avoid squeal and keep non-moving caliper pad as near as disc as poss, to avoid excessive deflection; can anyone advise a recommended method to position it as best as poss, please?

I have a datatag - the only places for it to go are in the open 'tailpipe' (where it would be easily spotted) and in the steering column. Any advice, please?

Also thinking about panniers / bags. I note a special bag is available, but costly. An ordinary shoulder bag affects stability, panniers on the rear rack would be well out of site - nickable in transit?