My brother, Alan, in the UK is looking at buying his first road bike and is looking at THIS one. Can anyone tell me though, why some bikes are sized using imperial inches rather than cm ? Alan is looking for an entry level bike and wanted to spend a max of 600 UK pounds, so if anyone knows of a good bargain ( near the London area) we would be interested to know. ( Preferably 9 or 10 speed Tiagra,…