I did the
100 mile bike ride in 2012. It is a beautiful and scenic route from and
to Norwich. It went through some small villages and along the Norfolk
coast. I was told the fens were flat but this did have its fair share of
hills. I rode my hybrid bike that I ride to an from work but a lot of
people had racing bikes because they are lighter.
I suggest
bringing water, sunscreen and food. It does have stops along the way
that will allow you to fill up with water, use the toilet and they sell
snacks. Halfway they have a compulsory 30 minutes stop. At these
distances like these I do suggest padded pants! I was kitted out in my Sweaty Betty cycling outfit. This was an enjoyable event and I might do it again.