It no doubt limited Roger’s wins in Paris-Roubaix, as the two had a pact not to attack each other.
As a result, Moser won Paris-Roubaix in 1978, 1979, and 1980 while De Vlaeminck was 2nd in 1978 and 1979. 1980 was the only year De Vlaeminck didn't finish because of a crash.
Below is Roger’s record at Paris-Roubaix.
In 1970, he was 2nd behind Eddy Merckx of Belgium.
In 1972, he was 1st in front of Andre Dierickx of Belgium and Barry Hoban of Great Britain.
In 1974, he was 1st in front of Francesco Moser of Italy and Marc De Meyer of Belgium.
In 1975, he was 1st in front of Eddy Merckx and Andre Dierickx.
In 1976, he was 3rd behind Marc De Meyer and Francesco Moser.
In 1977, he was 1st in front of Willy Teirlinck and Freddy Maertens of Belgium.
In 1978, he was 2nd behind Francesco Moser of Italy.
In 1979, he was 2nd behind Francesco Moser of Italy.
In 1981, he was 2nd behind Bernard Hinault of France.
In other races, Roger won the Milan-San Remo Classic three times, 1973, 1978, and 1979.