hey all i have a chance to purchase a new set of bontys at a great price. i ride a powertap rear training wheel and have always raced on tubulars, i have no problems with the fitting of tubulars tyres. what im after is a pure performance comparison of the d3 clincher to tubby. the tubular is lighter the white paper states the clincher is more aero. i woule be looking at the 7 unless you can convince me otherwise. im a 77kg tt loving sprint hating road racer. a grade over here, cat 1/2 i guess. i can climb enough to get me through most races but i just attempt to break away in a small group or solo. cx wrench what is your opinion?