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@sexy_tecnos
Cheaper frames have more resin in than more costly ones, hence the tarmac at £1300 even though its an SL4 frame is heavier than the Tarmac sl4 at £3000 frame. They are made by having a bag inside that when the frame is formed he bag is removed, to do this there is a sacrificial layer on the inside that gets shagged when bag is removed so individual frames can have slight weight discrepancy. The McLaren tarmac uses a very special frame production that does not need the sacrificial layer so lighter and more consistent weight. The De Rosa costs more as it has less resin and a more complex carbon lay up. But you have a budget and wheels are an important element of any bike, I personally would have gone for the tarmac used the wheels that are on it as unimpressive as they are then chose some nice ones to save for.