TTing on fixed wheel pursuit bike is actually quite smart. No faffing around with gears just concentrate on hurting yourself. My pursuit bike is quite similar to PNUT's bike. Great stuff. When I was a student I could ride 5 hours in the day then a 10mile TT in the evening on the fixed and do a decent time on a rolling course. Just stick on 52 or 53 x 15, wind it up then hold it over any hill you can. Looking forward to doing that again when the day gets a bit longer even if work will prevent me from doing the 5 hour bit first. Maybe Dr Ferrari can help us go a bit quicker.