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@Fignon
The Mavic crank system was versatile. On the same set of cranks you could use them either as a Pista, road double or triple. This was achieved via spacers and bolts.
Correct chainline was arrived at by using the appropriate Mavic bottom bracket, with spindle lengths of 110mm track, 114mm road double and 119mm for the triple.
The 'Pista' cranks you see in the above photo are merely 631's with only one ring attached.
BTW : if anybody has a Mavic 39 tooth chainring and the dustcaps let me know.