Paris Brest Paris (PBP) LFGSS 2011

You are on the start sheet, with handicap (reasonably generous too).

My arithmetic isn't quite up to calculating a gear so accurately, especially since I don't really know how fast you will go. However something in the mid eighties shouldn't be too far wrong - the human body being wonderfully adaptable. There are no steep climbs.

Using this calculator: http://www.sheldonbrown.com/gears/

A 67.2" gear gets you 20mph at 100rpm
71.1" gear is 21.2mph at 100rpm
75.6" is 22.5mph at 100rpm
80.6" is 24.0mph at 100rpm
86.3" is 25.7mph at 100rpm
93.0" is 27.7mph at 100rpm
100.7" is 30.0mph at 100rpm