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@Smallfurry
108watts is 15mph on my trainer.
I need to be in 50:23 spinning the cranks at 85rpm to do a 100watt warm up. But dropping into 34:17 allows me to spin at 95rpm, which is a better warm up cadence for me. (Plus its less stressful on the drivechain).
Obviously your trainer will differ. But not by loads.
This helps get a feel for the gearing that you should be looking to, to achive desired speeds (and thus power), while spinning at a cadence that suits, for the workouts.
http://www.machars.net/bikecalc.htm