The 1978 E3 Harelbeke was the 21st edition of the E3 Harelbeke cycle race and was held on 1 April 1978. The race started and finished in Harelbeke. The race was won by Freddy Maertens.
General classification
Final general classification Rank Rider Time 1 2 + 8" 3 + 44" 4 + 44" 5 + 2' 30" 6 + 2' 30" 7 + 2' 30" 8 + 2' 30" 9 + 2' 30" 10 + 2' 30"
References