For all you U.S. citizens out there, the Modern World now measures weight in Kilograms
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My Spider is a 1976 CS1 with a 2-litre twin cam and 131 gearbox, it was weighed with the spare wheel and basic tools on board and 1/4 of a tank of fuel.
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The Coupe is a 1968 torque-tube AC with a 1600 twin cam. Although used extensively as a tarmac rally competition car, it's never had any weight cut out of it (still has a back seat, all the trim and roof lining) and it's fitted with a full roll cage, hydraulic handbrake and other bits of rally gear. It was weighed with the spare wheel and a couple of gallons of fuel in the tank - but was still 20kg lighter than the Spider.
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The Spider has very slightly better front / rear weight distribution at 53.5 / 46.5 against the Coupe's 54.3 / 45.7, but generally the weight distribution of both 124s is fairly good.