On the subject of flats, I went to meet up with the lads for a trundle in NY's Day and I hadn't ridden a km whereupon I got the 'sinking feeling' of a rear flat. It was caused by a shard of glass which I found embedded in the tyre and flicked it out. I patched the tube rather than used my spare and went on my way without any further issues. I used CO2 to inflate as I would have been late otherwise but with CO2 the tube will lose pressure after 48hrs so I always let the CO2 out when I am home and fill with atmospheric air once again.