As part of the French national project SOLCYP, driven, bored and screwed instrumented piles were installed in the overconsolidated Flanders clay. Piles were submitted to series of static and cyclic load tests to failure. This paper focuses on a comparison of the ultimate capacities and local skin frictions measured on the three types of piles under static loading. The effects of the installation method and of the particular soil properties on the behaviour of the piles are discussed. Results are compared to prediction methods.