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@Greenbank
So far I'm 4 minutes faster on gears than fixed.
66:25 on gears.
70:05 on 67" fixed.
Weather was better for the geared bike run though.
Comparing the two runs (with a 3km trip to and from the park):
(Pink plot is the geared bike. Blue is the fixed.)
Speed wise: http://www.greenbank.org/misc/rp_comparison_speed.jpg
HR wise: http://www.greenbank.org/misc/rp_comparison_hr.jpg
I slacked off on the first lap on fixed. I also got horrendous cramp on the 3rd lap on fixed on the descent to Ham gate (28.5km on the graph). Had to stop for 30 seconds to stretch it out.
Also, geared bike I can descend faster, and maintain the speed for longer.
Managed 57.3kph (177rpm) on this weekends hilly ride so I'll have to give it another go on fixed soon.
Goal is sub 60-mins on gears. Sub 65-mins on fixed. 3 laps is as near to 20 miles as you'll ever get, so an hour for 3 laps represents the holy grail of a 20mph average.