For 2006 the bike industry is hyping six-inch trail bikes as the do-it-all ride - but which will be the ultimate trail bike?

The magic number? Nothing beats a cold pint of premium Czech lager at 5% alcohol on a sunny afternoon after a long ride...or does it? How about a high strength weiss beer from the low countries? Or a northern ale at 4% from a local brewer. They each have a place, much like our 4,5 and 6 inch trail bikes - but which goes down (and up) our hills best is a tough call. Is four inches enough for UK trails or do riders need five or six inches...?