Direct Hit Not Required
Join Date: Nov 2003
Location: San Bruno, CA
Bikes: Leopard DC1, Ridley X-Fire, GT Zaskar 9r
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From what I deduced, having owned the M571 and M572 cranks and ES50, ES70 and ES71 BBs, is that the splines are identical but the M572 crankset needs a much longer spindle to give a proper chainline, 121 mm instead of the older 113mm. The longer spindle lengths are only available in the the ES51 model. The ES71 model only come in 113 and 118 lengths.
An ES71 in 113mm or 118mm (73mm shell) will work with the M571 because that's what I'm running on my MTB now.