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@bq
You'd need to be doing about 30 on the straights to make up for your losses on the roundabouts. I managed 29.7 along there (once and once only) on 69 inches. You also need to be very lucky with the roundabouts. I had to wait patiently for 2 cars and a bus last time, so my geared time is even worse than my fixed one.
I don't think I'll be TT-ing again, gears or fixed. It makes me too knackered to drink enough beer.