That's awesome, it's *exactly* what I'm looking for!
You used a time trial/tri bike - would that make bars too wide for RPM? This is why I was thinking road bike with clip-on aero bar, although I suppose it doesn't make that much difference (and most spin bikes have bars a little wider than road bikes anyway).
The turbo trainer - wind, mag or fluid? I hear the wind ones are pretty loud and the mag/fluid trainers quieter.
Anyway, you've vindicated my theory - it's off to buy a trainer time!
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Alasdair.